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Psychology is the
scientific Science is a systematic endeavor that Scientific method, builds and organizes knowledge in the form of Testability, testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earli ...
study of
mind The mind is the set of faculties responsible for all mental Phenomenon, phenomena. Often the term is also identified with the phenomena themselves. These faculties include thought, imagination, memory, Will (philosophy), will, and Sensation (psy ...
and
behavior Behavior (American English) or behaviour (British English) is the range of Action (philosophy), actions and mannerisms made by individuals, organisms, systems or Artificial Intelligence, artificial entities in some environment. These systems c ...
. Psychology includes the study of
conscious Consciousness, at its simplest, is sentience and awareness of internal and external existence. However, the lack of definitions has led to millennia of analyses, explanations and debates by philosophers, theologians, linguisticians, and scient ...
and unconscious phenomena, including
feeling Feelings are Subjectivity, subjective self-contained phenomenal experiences. According to the ''APA Dictionary of Psychology'', a feeling is "a self-contained phenomenal experience"; and feelings are "subjective, evaluative, and independent of t ...
s and
thought In their most common sense, the terms thought and thinking refer to conscious cognitive Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasse ...
s. It is an academic discipline of immense scope, crossing the boundaries between the
natural Nature, in the broadest sense, is the physics, physical world or universe. "Nature" can refer to the phenomenon, phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. ...
and
social science Social science is one of the branches of science, devoted to the study of society, societies and the Social relation, relationships among individuals within those societies. The term was formerly used to refer to the field of sociology, the o ...
s. Psychologists seek an understanding of the emergent properties of
brain A brain is an organ (biology), organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It is located in the head, usually close to the sensory organs for senses such as Visual perception, vision. I ...
s, linking the discipline to
neuroscience Neuroscience is the science, scientific study of the nervous system (the brain, spinal cord, and peripheral nervous system), its functions and disorders. It is a Multidisciplinary approach, multidisciplinary science that combines physiology, an ...
. As social scientists, psychologists aim to understand the behavior of individuals and groups.Fernald LD (2008)
''Psychology: Six perspectives''
(pp.12–15). Thousand Oaks, CA: Sage Publications.
Hockenbury & Hockenbury. Psychology. Worth Publishers, 2010. Ψ (''psi''), the first
letter Letter, letters, or literature may refer to: Characters typeface * Letter (alphabet), a character representing one or more of the sounds used in speech; any of the symbols of an alphabet. * Letterform, the graphic form of a letter of the alphabe ...
of the Greek word ''psyche'' from which the term psychology is derived (see below), is commonly associated with the science. A professional practitioner or researcher involved in the discipline is called a
psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processes and behavior. Their work often involves the experimentation, observation, and interpretation of how indi ...
. Some psychologists can also be classified as
behavioral Behavior (American English American English, sometimes called United States English or U.S. English, is the set of variety (linguistics), varieties of the English language native to the United States. English is the Languages of the Unit ...
or cognitive scientists. Some psychologists attempt to understand the role of mental functions in individual and
social behavior Social behavior is behavior among two or more organisms within the same species, and encompasses any behavior in which one member affects the other. This is due to an interaction among those members. Social behavior can be seen as similar to an ...
. Others explore the
physiological Physiology (; ) is the science, scientific study of function (biology), functions and mechanism (biology), mechanisms in a life, living system. As a branches of science, sub-discipline of biology, physiology focuses on how organisms, organ syst ...
and neurobiological processes that underlie cognitive functions and behaviors. Psychologists are involved in research on
perception Perception () is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment. All perception involves signals that go through the nervous syste ...
,
cognition Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of Intellect, intellectual functions and processes such as: perception, attentio ...
,
attention Attention is the behavioral and cognitive process of selectively concentrating on a discrete aspect of information, whether considered subjective or objective, while ignoring other perceivable information. William James (1890) wrote that "A ...
,
emotion Emotions are mental states brought on by neurophysiology, neurophysiological changes, variously associated with thoughts, feelings, behavioral responses, and a degree of pleasure or suffering, displeasure. There is currently no scientific ...
,
intelligence Intelligence has been defined in many ways: the capacity for abstraction, logic, understanding, self-awareness, learning Learning is the process of acquiring new understanding, knowledge, behaviors, skills, value (personal and cultura ...
, subjective experiences,
motivation Motivation is the reason for which humans and other animals initiate, continue, or terminate a behavior at a given time. Motivational states are commonly understood as forces acting within the agent that create a disposition to engage in goal-dire ...
, brain functioning, and
personality Personality is the characteristic sets of behaviors, cognitions, and emotional patterns that are formed from biological and environmental factors, and which change over time. While there is no generally agreed-upon definition of personality, mos ...
. Psychologists' interests extend to
interpersonal relationship The concept of interpersonal relationship involves social associations, connections, or affiliations between two or more people. Interpersonal relationships vary in their degree of intimacy or self-disclosure, but also in their duration, in t ...
s,
psychological resilience Psychological resilience is the ability to Coping (psychology), cope mentally or emotionally with a crisis or to return to pre-crisis status quickly. The term was coined in the 1970s by a psychologist named Emmy E. Werner as she conducted a for ...
,
family resilience An important part of the heritage of family resilience is the concept of individual psychological resilience Psychological resilience is the ability to Coping (psychology), cope mentally or emotionally with a crisis or to return to pre-crisis s ...
, and other areas within
social psychology Social psychology is the scientific study of how thoughts, feelings, and behaviors are influenced by the real or imagined presence of other people or by social norms. Social psychologists typically explain human behavior as a result of the rela ...
. They also consider the unconscious mind.
Psychoanalysis PsychoanalysisFrom Greek: + . is a set of theories and therapeutic techniques"What is psychoanalysis? Of course, one is supposed to answer that it is many things — a theory, a research method, a therapy, a body of knowledge. In what might ...
and other forms of
depth psychology Depth psychology (from the German term ''Tiefenpsychologie'') refers to the practice and research of the science of the unconscious, covering both psychoanalysis and psychology. It is also defined as the psychological theory that explores the rela ...
are most typically associated with theories about the unconscious mind. By contrast,
behaviorist Behaviorism is a systematic approach to understanding the behavior of humans and animals. It assumes that behavior is either a reflex evoked by the pairing of certain antecedent stimuli in the environment, or a consequence of that individual ...
s consider such phenomena as
classical conditioning Classical conditioning (also known as Pavlovian or respondent conditioning) is a behavioral procedure in which a biologically potent stimulus (e.g. food) is paired with a previously neutral stimulus (e.g. a triangle A triangle is a polyg ...
and
operant conditioning Operant conditioning, also called instrumental conditioning, is a learning process where behaviors are modified through the association of stimuli with reinforcement or punishment. In it, operants—behaviors that affect one's environment—are c ...
. Cognitivists explore
implicit memory In psychology, implicit memory is one of the two main types of Long-term memory, long-term human memory. It is acquired and used Unconsciousness, unconsciously, and can affect thoughts and Behavior, behaviours. One of its most common forms is proce ...
,
automaticity Automaticity is the ability to do things without occupying the mind with the low-level details required, allowing it to become an automatic response pattern or habit (psychology), habit. It is usually the result of learning, repetition (learning) ...
, and
subliminal message Subliminal stimuli (; the prefix ' literally means "below" or "less than") are any sensory stimulus (physiology), stimuli below an individual's sensory threshold, threshold for conscious perception, in contrast to stimuli (above threshold). A 201 ...
s, all of which are understood either to bypass or to occur outside of conscious effort or attention. Indeed,
cognitive-behavioral therapist Cognitive behavioral therapy (CBT) is a psycho-social intervention that aims to reduce symptoms of various mental health conditions, primarily depression and anxiety disorders. CBT focuses on challenging and changing cognitive distortions (su ...
s counsel their clients to become aware of maladaptive thought patterns, the nature of which the clients previously had not been conscious.
Research psychologists employ
empirical methods Empirical research is research using empirical evidence. It is also a way of gaining knowledge by means of direct and indirect observation or experience. Empiricism values some research more than other kinds. Empirical evidence (the record of one ...
to infer
causal Causality (also referred to as causation, or cause and effect) is influence by which one Event (relativity), event, process, state, or object (''a'' ''cause'') contributes to the production of another event, process, state, or object (an ''eff ...
and
correlation In statistics, correlation or dependence is any statistical relationship, whether causality, causal or not, between two random variables or bivariate data. Although in the broadest sense, "correlation" may indicate any type of association, in ...
al relationships between psychosocial variables. Some, but not all, clinical and
counseling Counseling is the professional guidance of the individual by utilizing psychological methods especially in collecting case history data, using various techniques of the personal interview, and testing interests and aptitudes. This is a list of co ...
psychologists rely on symbolic interpretation. While psychological knowledge is often applied to the assessment and treatment of mental health problems, it is also directed towards understanding and solving problems in several spheres of human activity. By many accounts, psychology ultimately aims to benefit society.O'Neil, H.F.; cited in Coon, D.; Mitterer, J.O. (2008)
''Introduction to psychology: Gateways to mind and behavior''
(12th ed., pp. 15–16). Stamford, CT: Cengage Learning.
"The mission of the APA merican Psychological Associationis to advance the creation, communication and application of psychological knowledge to benefit society and improve people's lives"; APA (2010)
''About APA''.
Retrieved 20 October 2010.
Many psychologists are involved in some kind of therapeutic role, practicing
psychotherapy Psychotherapy (also psychological therapy, talk therapy, or talking therapy) is the use of Psychology, psychological methods, particularly when based on regular Conversation, personal interaction, to help a person change behavior, increase hap ...
in clinical, counseling, or
school A school is an educational institution designed to provide learning spaces and learning environments for the teaching of students under the direction of teachers. Most countries have systems of formal education, which is sometimes compulsor ...
settings. Other psychologists conduct scientific research on a wide range of topics related to mental processes and behavior. Typically the latter group of psychologists work in academic settings (e.g., universities, medical schools, or hospitals). Another group of psychologists is employed in industrial and organizational settings. Yet others are involved in work on
human development Human development may refer to: * Development of the human body * Developmental psychology * Human development (economics) * Human Development Index, an index used to rank countries by level of human development * Human evolution, the prehistoric ...
, aging,
sports Sport pertains to any form of Competition, competitive physical activity or game that aims to use, maintain, or improve physical ability and Skill, skills while providing enjoyment to participants and, in some cases, entertainment to specta ...
, health,
forensic science Forensic science, also known as criminalistics, is the application of science to Criminal law, criminal and Civil law (legal system), civil laws, mainly—on the criminal side—during criminal investigation, as governed by the legal standard ...
,
education Education is a purposeful activity directed at achieving certain aims, such as transmitting knowledge or fostering skills and character traits. These aims may include the development of understanding, rationality, kindness, and honesty ...
, and the
media Media may refer to: Communication * Media (communication), tools used to deliver information or data ** Advertising media, various media, content, buying and placement for advertising ** Broadcast media, communications delivered over mass el ...
.


Etymology and definitions

The word ''
psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenomena, including feelings and thoughts. It is an academic discipline of immens ...
'' derives from the Greek word ''psyche'', for spirit or
soul In many religious and philosophical traditions, there is a belief that a soul is "the immaterial aspect or essence of a human being". Etymology The Modern English noun '':wikt:soul, soul'' is derived from Old English ''sāwol, sāwel''. The ea ...
. The latter part of the word "psychology" derives from -λογία ''-logia'', which refers to "study" or "research".Online Etymology Dictionary. (2001)
"Psychology"
.
The
Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...
word ''psychologia'' was first used by the
Croatia , image_flag = Flag of Croatia.svg , image_coat = Coat of arms of Croatia.svg , anthem = " Lijepa naša domovino"("Our Beautiful Homeland") , image_map = , map_caption = , capi ...
n
humanist Humanism is a philosophical Philosophy (from , ) is the systematized study of general and fundamental questions, such as those about existence, reason, Epistemology, knowledge, Ethics, values, Philosophy of mind, mind, and Philo ...
and
Latinist Latin (, or , ) is a classical language A classical language is any language with an independent literary tradition and a large and ancient body of written literature. Classical languages are typically Extinct language, dead languages, or ...
Marko Marulić in his book, ''
Psichiologia de ratione animae humanae ''Psichiologia de ratione animae humanae'' (Croatian language, Croatian: ''Psihologija, o naravi ljudske duše'')Steven Blankaart in 1694 in ''The Physical Dictionary''. The dictionary refers to "Anatomy, which treats the Body, and Psychology, which treats of the Soul."(Steven Blankaart, p. 13) as quoted in "psychology n." A Dictionary of Psychology. Edited by Andrew M. Colman. Oxford University Press 2009. Oxford Reference Online. Oxford University Press
oxfordreference.com
In 1890,
William James William James (January 11, 1842 – August 26, 1910) was an List of American philosophers, American philosopher, historian, and psychologist, and the first educator to offer a psychology course in the United States. James is considered to ...
defined ''psychology'' as "the science of mental life, both of its phenomena and their conditions." This definition enjoyed widespread currency for decades. However, this meaning was contested, notably by radical
behaviorists Behaviorism is a systematic approach to understanding the behavior of humans and animals. It assumes that behavior is either a reflex In biology Biology is the scientific study of life. It is a natural science with a broad scope b ...
such as John B. Watson, who in 1913 asserted that the discipline is a "natural science", the theoretical goal of which "is the prediction and control of behavior." Since James defined "psychology", the term more strongly implicates scientific
experiment An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried. Experiments provide insight into cause-and-effect by demonstrating what outcome occurs wh ...
ation.
Folk psychology In philosophy of mind and cognitive science, folk psychology, or commonsense psychology, is a human capacity to explain and predict the behavior and Cognitive psychology, mental state of other people. Processes and items encountered in daily life s ...
refers to
ordinary people ''Ordinary People'' is a 1980 American drama film In film and television show, television, drama is a category or genre of narrative fiction (or docudrama, semi-fiction) intended to be more serious than humour, humorous in tone. Drama of ...
's, as contrasted with psychology professionals', understanding of the mental states and behaviors of people.


History

The ancient civilizations of Egypt, Greece, China, India, and Persia all engaged in the philosophical study of psychology. In Ancient Egypt the Ebers Papyrus mentioned depression and thought disorders. Historians note that Greek philosophers, including
Thales Thales of Miletus ( ; grc-gre, wikt:Θαλῆς, Θαλῆς; ) was a Greeks, Greek Greek Mathematics, mathematician, astronomer, statesman, and Pre-Socratic philosophy, pre-Socratic philosopher from Miletus in Ionia, Asia Minor. He was one of ...
,
Plato Plato ( ; grc-gre, wikt:Πλάτων, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was a Greeks, Greek philosopher born in Athens during the Classical Greece, Classical period in Ancient Greece. He founded the Platonist school of thou ...
, and
Aristotle Aristotle (; grc-gre, Ἀριστοτέλης ''Aristotélēs'', ; 384–322 BC) was a Greek philosopher and polymath during the Classical Greece, Classical period in Ancient Greece. Taught by Plato, he was the founder of the Peripatet ...
(especially in his ''
De Anima ''On the Soul'' (Ancient Greek, Greek: , ''Peri Psychēs''; Latin: ''De Anima'') is a major treatise written by Aristotle c. 350 BC. His discussion centres on the kinds of souls possessed by different kinds of living things, distinguished by the ...
'' treatise), addressed the workings of the mind. As early as the 4th century BC, the Greek physician
Hippocrates Hippocrates of Kos (; grc-gre, Ἱπποκράτης ὁ Κῷος, Hippokrátēs ho Kôios; ), also known as Hippocrates II, was a Greek physician of the Classical Greece, classical period who is considered one of the most outstanding figures ...
theorized that
mental disorder A mental disorder, also referred to as a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. Such features may be persistent, relapsing and remitti ...
s had physical rather than supernatural causes. In 387 BCE, Plato suggested that the brain is where mental processes take place, and in 335 BCE Aristotle suggested that it was the heart. In China, psychological understanding grew from the philosophical works of
Laozi Laozi (), also known by #Names, numerous other names, was a Chinese legend, semilegendary ancient China, ancient Chinese Taoism, Taoist Chinese philosophy, philosopher. Laozi ( zh, ) is a Chinese honorific, generally translated as "the Old Ma ...
and
Confucius Confucius ( ; zh, s=, p=Kǒng Fūzǐ, "Master Kǒng"; or commonly zh, s=, p=Kǒngzǐ, labels=no; – ) was a Chinese philosopher and politician of the Spring and Autumn period who is traditionally considered the paragon of Chinese sages. Co ...
, and later from the doctrines of
Buddhism Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religions, Indian religion or Indian philosophy#Buddhist philosophy, philosophical tradition based on Pre-sectarian Buddhism, teachings attributed to the Buddha. ...
. This body of knowledge involves insights drawn from introspection and observation, as well as techniques for focused thinking and acting. It frames the universe in term of a division of physical reality and mental reality as well as the interaction between the physical and the mental. Chinese philosophy also emphasized purifying the mind in order to increase virtue and power. An ancient text known as '' The Yellow Emperor's Classic of Internal Medicine'' identifies the brain as the nexus of wisdom and sensation, includes theories of personality based on yin–yang balance, and analyzes mental disorder in terms of physiological and social disequilibria. Chinese scholarship that focused on the brain advanced during the
Qing Dynasty The Qing dynasty ( ), officially the Great Qing,, was a Manchu people, Manchu-led Dynasties in Chinese history, imperial dynasty of China and the last orthodox dynasty in Chinese history. It emerged from the Later Jin (1616–1636), La ...
with the work of Western-educated Fang Yizhi (1611–1671), Liu Zhi (1660–1730), and Wang Qingren (1768–1831). Wang Qingren emphasized the importance of the brain as the center of the nervous system, linked mental disorder with brain diseases, investigated the causes of dreams and
insomnia Insomnia, also known as sleeplessness, is a sleep disorder in which people have trouble sleeping. They may have difficulty falling asleep, or staying asleep as long as desired. Insomnia is typically followed by daytime sleepiness, low energy, ...
, and advanced a theory of hemispheric lateralization in brain function.Yeh Hsueh and Benyu Guo, "China", in Baker (ed.), ''Oxford Handbook of the History of Psychology'' (2012). Influenced by
Hinduism Hinduism () is an Indian religions, Indian religion or ''dharma'', a religious and universal order or way of life by which followers abide. As a religion, it is the Major religious groups, world's third-largest, with over 1.2–1.35 billion ...
,
Indian philosophy Indian philosophy refers to philosophical traditions of the Indian subcontinent. A traditional Hindu classification divides āstika and nāstika schools of philosophy, depending on one of three alternate criteria: whether it believes the Ve ...
explored distinctions in types of awareness. A central idea of the ''
Upanishads The Upanishads (; sa, उपनिषद् ) are late Vedic Sanskrit texts that supplied the basis of later Hindu philosophy.Wendy Doniger (1990), ''Textual Sources for the Study of Hinduism'', 1st Edition, University of Chicago Press, , ...
'' and other
Vedic FIle:Atharva-Veda samhita page 471 illustration.png, upright=1.2, The Vedas are ancient Sanskrit texts of Hinduism. Above: A page from the ''Atharvaveda''. The Vedas (, , ) are a large body of religious texts originating in ancient India. Co ...
texts that formed the foundations of Hinduism was the distinction between a person's transient mundane self and their eternal, unchanging soul. Divergent Hindu doctrines and
Buddhism Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religions, Indian religion or Indian philosophy#Buddhist philosophy, philosophical tradition based on Pre-sectarian Buddhism, teachings attributed to the Buddha. ...
have challenged this hierarchy of selves, but have all emphasized the importance of reaching higher awareness.
Yoga Yoga (; sa, योग, lit=yoke' or 'union ) is a group of Asana, physical, mental, and Spirituality#Asian traditions, spiritual practices or disciplines which originated in History of India, ancient India and aim to control (yoke) and Ś ...
encompasses a range of techniques used in pursuit of this goal.
Theosophy Theosophy is a religion established in the United States during the late 19th century. It was founded primarily by the Russian Helena Blavatsky and draws its teachings predominantly from Blavatsky's writings. Categorized by scholars of religion a ...
, a religion established by
Russian-American Russian Americans ( rus, русские американцы, r=russkiye amerikantsy, p= ˈruskʲɪje ɐmʲɪrʲɪˈkant͡sɨ) are Americans of full or partial Russians, Russian ancestry. The term can apply to recent Russian diaspora, Russian imm ...
philosopher
Helena Blavatsky Helena Petrovna Blavatsky, uk, Олена Петрівна Блаватська, Olena Petrivna Blavatska (; – 8 May 1891), often known as Madame Blavatsky, was a Russian Mysticism, mystic and author who co-founded the Theosophical Socie ...
, drew inspiration from these doctrines during her time in
British India The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one ...
.Anand C. Paranjpe, "From Tradition through Colonialism to Globalization: Reflections on the History of Psychology in India", in Brock (ed.), ''Internationalizing the History of Psychology'' (2006).PT Raju (1985), Structural Depths of Indian Thought, State University of New York Press, , pages 35-36 Psychology was of interest to Enlightenment thinkers in Europe. In Germany,
Gottfried Wilhelm Leibniz Gottfried Wilhelm (von) Leibniz . ( – 14 November 1716) was a German polymath active as a mathematician, philosopher, scientist and diplomat. He is one of the most prominent figures in both the history of philosophy and the history of mathema ...
(1646–1716) applied his principles of calculus to the mind, arguing that mental activity took place on an indivisible continuum. He suggested that the difference between conscious and unconscious awareness is only a matter of degree. Christian Wolff identified psychology as its own science, writing ''Psychologia Empirica'' in 1732 and ''Psychologia Rationalis'' in 1734.
Immanuel Kant Immanuel Kant (, , ; 22 April 1724 – 12 February 1804) was a German Philosophy, philosopher and one of the central Age of Enlightenment, Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works in epistemolo ...
advanced the idea of
anthropology Anthropology is the scientific study of humanity, concerned with human behavior, human biology, cultures, societies, and linguistics Linguistics is the scientific study of human language. It is called a scientific study because i ...
as a discipline, with psychology an important subdivision. Kant, however, explicitly rejected the idea of an
experimental psychology Experimental psychology refers to work done by those who apply Experiment, experimental methods to psychological study and the underlying processes. Experimental psychologists employ Research participant, human participants and Animal testing, a ...
, writing that "the empirical doctrine of the soul can also never approach chemistry even as a systematic art of analysis or experimental doctrine, for in it the manifold of inner observation can be separated only by mere division in thought, and cannot then be held separate and recombined at will (but still less does another thinking subject suffer himself to be experimented upon to suit our purpose), and even observation by itself already changes and displaces the state of the observed object." In 1783, Ferdinand Ueberwasser (1752–1812) designated himself ''Professor of Empirical Psychology and Logic'' and gave lectures on scientific psychology, though these developments were soon overshadowed by the
Napoleonic Wars The Napoleonic Wars (1803–1815) were a series of major global conflicts pitting the First French Empire, French Empire and its allies, led by Napoleon, Napoleon I, against a fluctuating array of Coalition forces of the Napoleonic Wars, Europe ...
. At the end of the Napoleonic era, Prussian authorities discontinued the Old University of Münster. Having consulted philosophers
Hegel Georg Wilhelm Friedrich Hegel (; ; 27 August 1770 – 14 November 1831) was a German philosopher. He is one of the most important figures in German idealism and one of the founding figures of 19th century philosophy, modern Western philosophy. ...
and
Herbart Johann Friedrich Herbart (; 4 May 1776 – 14 August 1841) was a German philosopher, psychologist and founder of pedagogy as an academic discipline. Herbart is now remembered amongst the post-Kantian philosophers mostly as making the greatest c ...
, however, in 1825 the Prussian state established psychology as a mandatory discipline in its rapidly expanding and highly influential
educational system The educational system generally refers to the structure of all institutions and the opportunities for obtaining education within a country. It includes all pre-school institutions, starting from family education, and/or early childhood education ...
. However, this discipline did not yet embrace experimentation.Horst U.K. Gundlach, "Germany", in Baker (ed.), ''Oxford Handbook of the History of Psychology'' (2012). In England, early psychology involved
phrenology Phrenology () is a pseudoscience Pseudoscience consists of statements, beliefs, or practices that claim to be both scientific and factual but are incompatible with the scientific method. Pseudoscience is often characterized by contradictory ...
and the response to social problems including alcoholism, violence, and the country's crowded "lunatic" asylums.


Beginning of experimental psychology

Philosopher
John Stuart Mill John Stuart Mill (20 May 1806 – 7 May 1873) was an English philosopher, Political economy, political economist, Member of Parliament (United Kingdom), Member of Parliament (MP) and civil servant. One of the most influential thinkers in the ...
believed that the human mind was open to scientific investigation, even if the science is in some ways inexact. Mill proposed a "mental
chemistry Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that make up matter to the compounds made of atoms, molecules and ions: their composition, structure, properties ...
" in which elementary thoughts could combine into ideas of greater complexity.
Gustav Fechner Gustav Theodor Fechner (; ; 19 April 1801 – 18 November 1887) was a German physicist, philosopher, and experimental psychologist. A pioneer in experimental psychology and founder of psychophysics (techniques for measuring the mind), he inspired ...
began conducting
psychophysics Psychophysics quantitatively investigates the relationship between physical stimulus (physiology), stimuli and the sensation (psychology), sensations and perceptions they produce. Psychophysics has been described as "the scientific study of the ...
research in
Leipzig Leipzig ( , ; Upper Saxon: ) is the most populous city in the Germany, German States of Germany, state of Saxony. Leipzig's population of 605,407 inhabitants (1.1 million in the larger urban zone) as of 2021 places the city as Germany's L ...
in the 1830s. He articulated the principle that human perception of a stimulus varies
logarithmically In mathematics Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented i ...
according to its intensity. The principle became known as the
Weber–Fechner law The Weber–Fechner laws are two related hypothesis, hypotheses in the field of psychophysics, known as Weber's law and Fechner's law. Both scientific law, laws relate to human perception, more specifically the relation between the actual change ...
. Fechner's 1860 ''Elements of Psychophysics'' challenged Kant's negative view with regard to conducting quantitative research on the mind. Fechner's achievement was to show that "mental processes could not only be given numerical magnitudes, but also that these could be measured by experimental methods." In Heidelberg,
Hermann von Helmholtz Hermann Ludwig Ferdinand von Helmholtz (31 August 1821 – 8 September 1894) was a German physicist and physician who made significant contributions in several scientific fields, particularly hydrodynamic stability. The Helmholtz Association ...
conducted parallel research on sensory perception, and trained physiologist
Wilhelm Wundt Wilhelm Maximilian Wundt (; ; 16 August 1832 – 31 August 1920) was a German physiologist, philosopher, and professor, known today as one of the fathers of modern psychology. Wundt, who distinguished psychology as a science from philosophy and ...
. Wundt, in turn, came to Leipzig University, where he established the psychological
laboratory A laboratory (; ; colloquially lab) is a facility that provides controlled conditions in which science, scientific or technological research, experiments, and measurement may be performed. Laboratory services are provided in a variety of settings: ...
that brought experimental psychology to the world. Wundt focused on breaking down mental processes into the most basic components, motivated in part by an analogy to recent advances in chemistry, and its successful investigation of the elements and structure of materials.Stanford Encyclopedia of Philosophy. (2006)
"Wilhelm Maximilian Wundt"
.
Paul Flechsig and
Emil Kraepelin Emil Wilhelm Georg Magnus Kraepelin (; ; 15 February 1856 – 7 October 1926) was a German psychiatrist. Hans Eysenck, H. J. Eysenck's ''Encyclopedia of Psychology'' identifies him as the founder of modern scientific psychiatry, psychopharmacolo ...
soon created another influential laboratory at Leipzig, a psychology-related lab, that focused more on experimental psychiatry. The German psychologist
Hermann Ebbinghaus Hermann Ebbinghaus (24 January 185026 February 1909) was a German psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processes and behavior. Their wo ...
, a researcher at the
University of Berlin Humboldt-Universität zu Berlin (german: Humboldt-Universität zu Berlin, abbreviated HU Berlin) is a German public research university in the central borough of Mitte in Berlin Berlin ( , ) is the capital and largest city of Germany ...
, was another 19th-century contributor to the field. He pioneered the experimental study of memory and developed quantitative models of learning and forgetting. In the early twentieth century, Wolfgang Kohler,
Max Wertheimer Max Wertheimer (April 15, 1880 – October 12, 1943) was an Austro-Hungarian Austria-Hungary, often referred to as the Austro-Hungarian Empire,, the Dual Monarchy, or Austria, was a constitutional monarchy and great power in Central Europe# ...
, and
Kurt Koffka Kurt Koffka (March 12, 1886 – November 22, 1941) was a German psychologist and professor. He was born and educated in Berlin, Berlin, Germany; he died in Northampton, Massachusetts from coronary thrombosis. He was influenced by his maternal ...
co-founded the school of
Gestalt psychology Gestalt-psychology, gestaltism, or configurationism is a school of psychology that emerged in the early twentieth century in Austria and Germany as a theory of perception Perception () is the organization, identification, and interp ...
(not to be confused with the
Gestalt therapy Gestalt therapy is a form of psychotherapy Psychotherapy (also psychological therapy, talk therapy, or talking therapy) is the use of Psychology, psychological methods, particularly when based on regular Conversation, personal interaction ...
of
Fritz Perls Friedrich Salomon Perls (July 8, 1893 – March 14, 1970), better known as Fritz Perls, was a Germany, German-born psychiatrist, psychoanalyst and psychotherapist. Perls Neologism, coined the term "Gestalt therapy" to identify the form of psychoth ...
). The approach of Gestalt psychology is based upon the idea that individuals experience things as unified wholes. Rather than reducing thoughts and behavior into smaller component elements, as in structuralism, the Gestaltists maintained that whole of experience is important, and differs from the sum of its parts. Psychologists in Germany, Denmark, Austria, England, and the United States soon followed Wundt in setting up laboratories.
G. Stanley Hall Granville Stanley Hall (February 1, 1846 – April 24, 1924) was a pioneering American psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social proce ...
, an American who studied with Wundt, founded a psychology lab that became internationally influential. The lab was located at
Johns Hopkins University Johns Hopkins University (Johns Hopkins, Hopkins, or JHU) is a private university, private research university in Baltimore, Maryland. Founded in 1876, Johns Hopkins is the oldest research university in the United States and in the western hem ...
. Hall, in turn, trained Yujiro Motora, who brought experimental psychology, emphasizing psychophysics, to the Imperial University of Tokyo.Miki Takasuna, "Japan", in Baker (ed.), ''Oxford Handbook of the History of Psychology'' (2012). Wundt's assistant, Hugo Münsterberg, taught psychology at Harvard to students such as Narendra Nath Sen Gupta—who, in 1905, founded a psychology department and laboratory at the
University of Calcutta The University of Calcutta (informally known as Calcutta University; CU) is a Public university, public collegiate university, collegiate State university (India), state university in India, located in Kolkata, West Bengal, India. Considered ...
. Wundt's students
Walter Dill Scott Walter Dill Scott (May 1, 1869 – September 24, 1955) was one of the first applied psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processes and be ...
,
Lightner Witmer Lightner Witmer (June 28, 1867 – July 19, 1956) was an American psychologist. He introduced the term "Clinical Psychology, clinical psychology" and is often credited with founding the field that it describes. Witmer created the world's first "ps ...
, and
James McKeen Cattell James McKeen Cattell (May 25, 1860 – January 20, 1944), an United States, American psychologist, was the first professor of psychology in the United States, teaching at the University of Pennsylvania, and a long-time editor and publisher of scie ...
worked on developing tests of mental ability. Cattell, who also studied with
eugenicist Eugenics ( ; ) is a Fringe science, fringe set of beliefs and practices that aim to improve the genetics, genetic quality of a human population. Historically, eugenicists have attempted to alter human gene pools by excluding people and groups ...
Francis Galton Sir Francis Galton, Fellow of the Royal Society, FRS Royal Anthropological Institute of Great Britain and Ireland, FRAI (; 16 February 1822 – 17 January 1911), was an English Victorian era polymath: a statistician, sociologist, psycholo ...
, went on to found the
Psychological Corporation Harcourt Assessment was a company that published and distributed educational and psychological assessment tools and therapy resources and provided educational assessment and data management services for national, state, district and local assessme ...
. Witmer focused on the mental testing of children; Scott, on employee selection. Another student of Wundt, the Englishman
Edward Titchener Edward Bradford Titchener (11 January 1867 – 3 August 1927) was an English psychologist who studied under Wilhelm Wundt for several years. Titchener is best known for creating his version of psychology that described the structure of the min ...
, created the psychology program at
Cornell University Cornell University is a private statutory land-grant research university based in Ithaca, New York. It is a member of the Ivy League. Founded in 1865 by Ezra Cornell and Andrew Dickson White, Cornell was founded with the intention to ...
and advanced " structuralist" psychology. The idea behind structuralism was to analyze and classify different aspects of the mind, primarily through the method of
introspection Introspection is the examination of one's own conscious thoughts and feelings. In psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious m ...
. William James,
John Dewey John Dewey (; October 20, 1859 – June 1, 1952) was an American philosopher, psychologist, and Education reform, educational reformer whose ideas have been influential in education and social reform. He was one of the most prominent American s ...
, and
Harvey Carr Harvey A. Carr (April 30, 1873 – June 21, 1954), a founding father of functionalist psychology, was renowned for a methodical and thorough approach to his science. His work was largely devoted to studies of animal cognition and perception. Carr ...
advanced the idea of functionalism, an expansive approach to psychology that underlined the Darwinian idea of a behavior's usefulness to the individual. In 1890, James wrote an influential book, ''
The Principles of Psychology ''The Principles of Psychology'' is an 1890 book about psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenomena, inc ...
'', which expanded on the structuralism. He memorably described " stream of consciousness." James's ideas interested many American students in the emerging discipline. Dewey integrated psychology with societal concerns, most notably by promoting
progressive education Progressive education, or protractivism, is a pedagogical movement that began in the late 19th century and has persisted in various forms to the present. In Europe, progressive education took the form of the New Education Movement. The term ''pro ...
, inculcating moral values in children, and assimilating immigrants. A different strain of experimentalism, with a greater connection to physiology, emerged in South America, under the leadership of Horacio G. Piñero at the
University of Buenos Aires The University of Buenos Aires ( es, Universidad de Buenos Aires, UBA) is a public university, public research university in Buenos Aires, Argentina. Established in 1821, it is the premier institution of higher learning in the country and one o ...
. In Russia, too, researchers placed greater emphasis on the biological basis for psychology, beginning with
Ivan Sechenov Doctor Ivan Mikhaylovich Sechenov (russian: Ива́н Миха́йлович Се́ченов; , Tyoply Stan (now Sechenovo) near Simbirsk, Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, tra ...
's 1873 essay, "Who Is to Develop Psychology and How?" Sechenov advanced the idea of brain
reflexes In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous response to a Stimulus (physiology), stimulus. Reflexes are found with varying levels of complexity in organisms with a nervous s ...
and aggressively promoted a
deterministic Determinism is a Philosophy, philosophical view, where all events are determined completely by previously existing causes. Deterministic theories throughout the history of philosophy have developed from diverse and sometimes overlapping motive ...
view of human behavior.Irina Sirotkina and Roger Smith, "Russian Federation", in Baker (ed.), ''Oxford Handbook of the History of Psychology'' (2012). The Russian-Soviet
physiologist Physiology (; ) is the scientific study of functions and mechanisms in a living system. As a sub-discipline of biology Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying the ...
Ivan Pavlov Ivan Petrovich Pavlov ( rus, Ива́н Петро́вич Па́влов, , p=ɪˈvan pʲɪˈtrovʲɪtɕ ˈpavləf, a=Ru-Ivan_Petrovich_Pavlov.ogg; 27 February 1936), was a Russian and Soviet experimental neurologist, psychologist and physiolo ...
discovered in dogs a learning process that was later termed "
classical conditioning Classical conditioning (also known as Pavlovian or respondent conditioning) is a behavioral procedure in which a biologically potent stimulus (e.g. food) is paired with a previously neutral stimulus (e.g. a triangle A triangle is a polyg ...
" and applied the process to human beings.


Consolidation and funding

One of the earliest psychology societies was ''La Société de Psychologie Physiologique'' in France, which lasted from 1885 to 1893. The first meeting of the International Congress of Psychology sponsored by the
International Union of Psychological Science The International Union of Psychological Science, abbreviated IUPsyS or the Union, is the global umbrella organization for psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consc ...
took place in Paris, in August 1889, amidst the World's Fair celebrating the centennial of the French Revolution. William James was one of three Americans among the 400 attendees. The
American Psychological Association The American Psychological Association (APA) is the largest scientific and professional organization of psychologists in the United States, with over 133,000 members, including scientists, educators, clinicians, consultants, and students. It has ...
(APA) was founded soon after, in 1892. The International Congress continued to be held at different locations in Europe and with wide international participation. The Sixth Congress, held in Geneva in 1909, included presentations in Russian, Chinese, and Japanese, as well as
Esperanto Esperanto ( or ) is the world's most widely spoken Constructed language, constructed international auxiliary language. Created by the Warsaw-based ophthalmologist L. L. Zamenhof in 1887, it was intended to be a universal second language for in ...
. After a hiatus for World War I, the Seventh Congress met in Oxford, with substantially greater participation from the war-victorious Anglo-Americans. In 1929, the Congress took place at Yale University in New Haven, Connecticut, attended by hundreds of members of the APA.Ludy T. Benjamin, Jr., and David B. Baker, "The Internationalization of Psychology: A History", in Baker (ed.), ''Oxford Handbook of the History of Psychology'' (2012). Tokyo Imperial University led the way in bringing new psychology to the East. New ideas about psychology diffused from Japan into China. American psychology gained status upon the U.S.'s entry into World War I. A standing committee headed by
Robert Yerkes Robert Mearns Yerkes (; May 26, 1876 – February 3, 1956) was an American psychologist, ethologist, Eugenics, eugenicist and Primatology, primatologist best known for his work in intelligence testing and in the field of comparative psychology. ...
administered mental tests ("
Army Alpha The Army Alpha is a group-administered test developed by Robert Yerkes and six others in order to evaluate the many U.S. military army recruit, recruits during World War I. It was first introduced in 1917 due to a demand for a systematic met ...
" and "
Army Beta The Army Beta 1917 is the non-verbal complement of the Army Alpha—a group-administered test developed by Robert Yerkes and six other committee members to evaluate some 1.5 million military recruits in the United States during World War I. ...
") to almost 1.8 million soldiers. Subsequently, the
Rockefeller family The Rockefeller family () is an American industrial, political Politics (from , ) is the set of activities that are associated with making decisions in groups, or other forms of power relations among individuals, such as the distrib ...
, via the
Social Science Research Council The Social Science Research Council (SSRC) is a US-based, NGO, independent, international nonprofit organization dedicated to advancing research in the social sciences and related disciplines. Established in Manhattan in 1923, it today maintains ...
, began to provide funding for behavioral research. Rockefeller charities funded the National Committee on Mental Hygiene, which disseminated the concept of mental illness and lobbied for applying ideas from psychology to child rearing. Through the Bureau of Social Hygiene and later funding of
Alfred Kinsey Alfred Charles Kinsey (; June 23, 1894 – August 25, 1956) was an American sexologist, biologist, and professor of entomology and zoology who, in 1947, founded the Institute for Sex Research at Indiana University Bloomington, Indiana University, ...
, Rockefeller foundations helped establish research on sexuality in the U.S. Under the influence of the Carnegie-funded
Eugenics Record Office The Eugenics Record Office (ERO), located in Cold Spring Harbor, New York, United States, was a research institute that gathered biological and social information about the American population, serving as a center for eugenics and human heredity ...
, the Draper-funded
Pioneer Fund Pioneer Fund is an American non-profit foundation established in 1937 "to advance the scientific study of heredity and human differences". The organization has been described as racist Racism is the belief that groups of humans possess diff ...
, and other institutions, the eugenics movement also influenced American psychology. In the 1910s and 1920s, eugenics became a standard topic in psychology classes.Guthrie, ''Even the Rat was White'' (1998), Chapter 4: "Psychology and Race" (pp. 88–110). "Psychology courses often became the vehicles for eugenics propaganda. One graduate of the Record Office training program wrote, 'I hope to serve the cause by infiltrating eugenics into the minds of teachers. It may interest you to know that each student who takes psychology here works up his family history and plots his family tree.' Harvard, Columbia, Brown, Cornell, Wisconsin, and Northwestern were among the leading academic institutions teaching eugenics in psychology courses." In contrast to the US, in the UK psychology was met with antagonism by the scientific and medical establishments, and up until 1939, there were only six psychology chairs in universities in England. During World War II and the Cold War, the U.S. military and intelligence agencies established themselves as leading funders of psychology by way of the armed forces and in the new
Office of Strategic Services The Office of Strategic Services (OSS) was the intelligence agency of the United States during World War II. The OSS was formed as an agency of the Joint Chiefs of Staff (JCS) to coordinate espionage activities behind enemy lines for all branc ...
intelligence agency. University of Michigan psychologist Dorwin Cartwright reported that university researchers began large-scale propaganda research in 1939–1941. He observed that "the last few months of the war saw a social psychologist become chiefly responsible for determining the week-by-week-propaganda policy for the United States Government." Cartwright also wrote that psychologists had significant roles in managing the domestic economy. The Army rolled out its new General Classification Test to assess the ability of millions of soldiers. The Army also engaged in large-scale psychological research of troop morale and mental health.Schonfeld, I.S., & Chang, C.-H. (2017). ''Occupational health psychology: Work, stress, and health''. New York, NY: Springer Publishing Company. In the 1950s, the
Rockefeller Foundation The Rockefeller Foundation is an American private foundation and philanthropy, philanthropic medical research and arts funding organization based at 420 Fifth Avenue, New York City. The second-oldest major philanthropic institution in America, aft ...
and
Ford Foundation The Ford Foundation is an American private foundation with the stated goal of advancing human welfare. Created in 1936 by Edsel Ford and his father Henry Ford, it was originally funded by a US$25,000 gift from Edsel Ford. By 1947, after the death ...
collaborated with the
Central Intelligence Agency The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian intelligence agency, foreign intelligence service of the federal government of the United States, officially tasked with gat ...
(CIA) to fund research on
psychological warfare Psychological warfare (PSYWAR), or the basic aspects of modern psychological operations (PsyOp), have been known by many other names or terms, including Military Information Support Operations (Psychological operations (United States), MISO), ...
. In 1965, public controversy called attention to the Army's
Project Camelot Project Camelot was the code name of a counterinsurgency Counterinsurgency (COIN) is "the totality of actions aimed at defeating irregular military, irregular forces". The Oxford English Dictionary defines counterinsurgency as any "military ...
, the "Manhattan Project" of social science, an effort which enlisted psychologists and anthropologists to analyze the plans and policies of foreign countries for strategic purposes. In Germany after World War I, psychology held institutional power through the military, which was subsequently expanded along with the rest of the military during
Nazi Germany Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...
. Under the direction of
Hermann Göring Hermann Wilhelm Göring (or Goering; ; 12 January 1893 – 15 October 1946) was a German politician, military leader and convicted war criminal. He was one of the most powerful figures in the Nazi Party The Nazi Party, officially ...
's cousin Matthias Göring, the
Berlin Psychoanalytic Institute The Berlin Psychoanalytic Institute (later the Göring Institute) was founded in 1920 to further the science of psychoanalysis in Berlin. Its founding members included Karl Abraham and Max Eitingon. The scientists at the institute furthered Sigmun ...
was renamed the Göring Institute. Freudian psychoanalysts were expelled and persecuted under the anti-Jewish policies of the
Nazi Party The Nazi Party, officially the National Socialist German Workers' Party (german: Nationalsozialistische Deutsche Arbeiterpartei or NSDAP), was a far-right politics, far-right political party in Germany active between 1920 and 1945 that crea ...
, and all psychologists had to distance themselves from
Freud Sigmund Freud ( , ; born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist and the founder of psychoanalysis, a clinical method for evaluating and treating psychopathology, pathologies explained as originatin ...
and Adler, founders of
psychoanalysis PsychoanalysisFrom Greek: + . is a set of theories and therapeutic techniques"What is psychoanalysis? Of course, one is supposed to answer that it is many things — a theory, a research method, a therapy, a body of knowledge. In what might ...
who were also Jewish. The Göring Institute was well-financed throughout the war with a mandate to create a "New German Psychotherapy." This psychotherapy aimed to align suitable Germans with the overall goals of the Reich. As described by one physician, "Despite the importance of analysis, spiritual guidance and the active cooperation of the patient represent the best way to overcome individual mental problems and to subordinate them to the requirements of the ''
Volk The German noun ''Volk'' () translates to :wikt:people, people, both uncountable in the sense of ''people'' as in a crowd, and countable (plural ''Völker'') in the sense of ''People, a people'' as in an ethnic group or nation (compare the E ...
'' and the '' Gemeinschaft''." Psychologists were to provide ''Seelenführung'' it., soul guidance the leadership of the mind, to integrate people into the new vision of a German community. Harald Schultz-Hencke melded psychology with the Nazi theory of biology and racial origins, criticizing psychoanalysis as a study of the weak and deformed. Johannes Heinrich Schultz, a German psychologist recognized for developing the technique of
autogenic training Autogenic training is a desensitization-relaxation technique developed by the Germany, German psychiatrist Johannes Heinrich Schultz by which a psychophysiologically determined Relaxation (psychology), relaxation response is obtained. The techniqu ...
, prominently advocated sterilization and euthanasia of men considered genetically undesirable, and devised techniques for facilitating this process. After the war, new institutions were created although some psychologists, because of their Nazi affiliation, were discredited. Alexander Mitscherlich founded a prominent applied psychoanalysis journal called ''Psyche''. With funding from the Rockefeller Foundation, Mitscherlich established the first clinical psychosomatic medicine division at Heidelberg University. In 1970, psychology was integrated into the required studies of medical students. After the
Russian Revolution The Russian Revolution was a period of Political revolution (Trotskyism), political and social revolution that took place in the former Russian Empire which began during the First World War. This period saw Russia abolish its monarchy and ad ...
, the
Bolsheviks The Bolsheviks (russian: Большевики́, from большинство́ ''bol'shinstvó'', 'majority'),; derived from ''bol'shinstvó'' (большинство́), "majority", literally meaning "one of the majority". also known in English ...
promoted psychology as a way to engineer the "New Man" of socialism. Consequently, university psychology departments trained large numbers of students in psychology. At the completion of training, positions were made available for those students at schools, workplaces, cultural institutions, and in the military. The Russian state emphasized
pedology Pedology (from Greek: πέδον, ''pedon'', "soil"; and λόγος, ''logos'', "study") is a discipline within soil science which focuses on understanding and characterizing soil formation, evolution, and the theoretical frameworks for modeling ...
and the study of child development.
Lev Vygotsky Lev Semyonovich Vygotsky (russian: Лев Семёнович Выго́тский, p=vɨˈɡotskʲɪj; be, Леў Сямёнавіч Выго́цкі, p=vɨˈɡotskʲɪj; – June 11, 1934) was a Soviet psychologist, known for his work on Deve ...
became prominent in the field of child development. The Bolsheviks also promoted
free love Free love is a social movement A social movement is a loosely organized effort by a large group of people to achieve a particular goal, typically a social or political one. This may be to carry out a social change, or to resist or undo o ...
and embraced the doctrine of psychoanalysis as an antidote to sexual repression. Although pedology and intelligence testing fell out of favor in 1936, psychology maintained its privileged position as an instrument of the Soviet Union. Stalinist purges took a heavy toll and instilled a climate of fear in the profession, as elsewhere in Soviet society. Following World War II, Jewish psychologists past and present, including
Lev Vygotsky Lev Semyonovich Vygotsky (russian: Лев Семёнович Выго́тский, p=vɨˈɡotskʲɪj; be, Леў Сямёнавіч Выго́цкі, p=vɨˈɡotskʲɪj; – June 11, 1934) was a Soviet psychologist, known for his work on Deve ...
, A.R. Luria, and Aron Zalkind, were denounced; Ivan Pavlov (posthumously) and Stalin himself were celebrated as heroes of Soviet psychology. Soviet academics experienced a degree of liberalization during the
Khrushchev Thaw The Khrushchev Thaw ( rus, хрущёвская о́ттепель, r=khrushchovskaya ottepel, p=xrʊˈɕːɵfskəjə ˈotʲ:ɪpʲɪlʲ or simply ''ottepel'')William Taubman, Khrushchev: The Man and His Era, London: Free Press, 2004 is the period ...
. The topics of cybernetics, linguistics, and genetics became acceptable again. The new field of
engineering psychology Engineering psychology, also known as Human Factors Engineering, is the science of human behavior Human behavior is the potential and expressed capacity (Energy (psychological), mentally, Physical activity, physically, and Social actions, soc ...
emerged. The field involved the study of the mental aspects of complex jobs (such as pilot and cosmonaut). Interdisciplinary studies became popular and scholars such as Georgy Shchedrovitsky developed systems theory approaches to human behavior. Twentieth-century Chinese psychology originally modeled itself on U.S. psychology, with translations from American authors like William James, the establishment of university psychology departments and journals, and the establishment of groups including the Chinese Association of Psychological Testing (1930) and the Chinese Psychological Society (1937). Chinese psychologists were encouraged to focus on education and language learning. Chinese psychologists were drawn to the idea that education would enable modernization. John Dewey, who lectured to Chinese audiences between 1919 and 1921, had a significant influence on psychology in China. Chancellor T'sai Yuan-p'ei introduced him at
Peking University Peking University (PKU; ) is a Public university, public research university in Beijing, China. The university is funded by the Ministry of Education of the People's Republic of China, Ministry of Education. Peking University was established as ...
as a greater thinker than Confucius. Kuo Zing-yang who received a PhD at the University of California, Berkeley, became President of
Zhejiang University Zhejiang University, abbreviated as ZJU or Zheda and formerly romanized as Chekiang University, is a National university, national public university, public research university based in Hangzhou, Zhejiang, China. It is a member of the prestigiou ...
and popularized
behaviorism Behaviorism is a systematic approach to understanding the behavior of humans and animals. It assumes that behavior is either a reflex evoked by the pairing of certain antecedent stimuli in the environment, or a consequence of that individual ...
. After the
Chinese Communist Party The Chinese Communist Party (CCP), officially the Communist Party of China (CPC), is the founding and One-party state, sole ruling party of the China, People's Republic of China (PRC). Under the leadership of Mao Zedong, the CCP emerged victoriou ...
gained control of the country, the Stalinist Soviet Union became the major influence, with
Marxism–Leninism Marxism–Leninism is a List of communist ideologies, communist ideology which was the main communist movement throughout the 20th century. Developed by the Bolsheviks, it was the state ideology of the Soviet Union, its Soviet satellite state ...
the leading social doctrine and Pavlovian conditioning the approved means of behavior change. Chinese psychologists elaborated on Lenin's model of a "reflective" consciousness, envisioning an "active consciousness" () able to transcend material conditions through hard work and ideological struggle. They developed a concept of "recognition" () which referred to the interface between individual perceptions and the socially accepted worldview; failure to correspond with party doctrine was "incorrect recognition." Psychology education was centralized under the
Chinese Academy of Sciences The Chinese Academy of Sciences (CAS); ), known by Academia Sinica in English until the 1980s, is the national academy of the People's Republic of China for natural sciences. It has historical origins in the Academia Sinica during the Republic ...
, supervised by the State Council. In 1951, the academy created a Psychology Research Office, which in 1956 became the Institute of Psychology. Because most leading psychologists were educated in the United States, the first concern of the academy was the re-education of these psychologists in the Soviet doctrines. Child psychology and pedagogy for the purpose of a nationally cohesive education remained a central goal of the discipline.


Disciplinary organization


Institutions

In 1920, Édouard Claparède and Pierre Bovet created a new applied psychology organization called the International Congress of Psychotechnics Applied to Vocational Guidance, later called the International Congress of Psychotechnics and then the
International Association of Applied Psychology The International Association of Applied Psychology (IAAP) was created in 1919 by Édouard Claparède under the name of International Association of Psychotechnics (Association Internationale de Psychotechnique) and the secretary general was :fr:Je ...
. The IAAP is considered the oldest international psychology association.Wade Pickren & Raymond D. Fowler, "Professional Organizations", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 1: ''History of Psychology''. Today, at least 65 international groups deal with specialized aspects of psychology. In response to male predominance in the field, female psychologists in the U.S. formed the National Council of Women Psychologists in 1941. This organization became the International Council of Women Psychologists after World War II and the International Council of Psychologists in 1959. Several associations including the Association of Black Psychologists and the Asian American Psychological Association have arisen to promote the inclusion of non-European racial groups in the profession. The
International Union of Psychological Science The International Union of Psychological Science, abbreviated IUPsyS or the Union, is the global umbrella organization for psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consc ...
(IUPsyS) is the world federation of national psychological societies. The IUPsyS was founded in 1951 under the auspices of the United Nations Educational, Cultural and Scientific Organization (UNESCO).Irmingard Staeuble, "Psychology in the Eurocentric Order of the Social Sciences: Colonial Constitution, Cultural Imperialist Expansion, Postcolonial Critique" in Brock (ed.), ''Internationalizing the History of Psychology'' (2006). Psychology departments have since proliferated around the world, based primarily on the Euro-American model. Since 1966, the Union has published the ''International Journal of Psychology''. IAAP and IUPsyS agreed in 1976 each to hold a congress every four years, on a staggered basis. IUPsyS recognizes 66 national psychology associations and at least 15 others exist. The American Psychological Association is the oldest and largest. Its membership has increased from 5,000 in 1945 to 100,000 in the present day.C. James Goodwin, "United States", in Baker (ed.), ''Oxford Handbook of the History of Psychology'' (2012). The APA includes 54 divisions, which since 1960 have steadily proliferated to include more specialties. Some of these divisions, such as the Society for the Psychological Study of Social Issues and the
American Psychology–Law Society The American Psychology–Law Society (AP–LS) is an academic society for legal Law is a set of rules that are created and are law enforcement, enforceable by social or governmental institutions to regulate behavior,Robertson, ''Crimes ag ...
, began as autonomous groups. The Interamerican Psychological Society, founded in 1951, aspires to promote psychology across the Western Hemisphere. It holds the Interamerican Congress of Psychology and ha had 1,000 members in year 2000. The European Federation of Professional Psychology Associations, founded in 1981, represents 30 national associations with a total of 100,000 individual members. At least 30 other international organizations represent psychologists in different regions. In some places, governments legally regulate who can provide psychological services or represent themselves as a "psychologist." The APA defines a psychologist as someone with a doctoral degree in psychology.Judy E. Hall and George Hurley, "North American Perspectives on Education, Training, Licensing, and Credentialing", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 8: ''Clinical Psychology''.


Boundaries

Early practitioners of experimental psychology distinguished themselves from
parapsychology Parapsychology is the study of alleged psychic phenomena ( extrasensory perception, telepathy Telepathy () is the purported vicariousness, vicarious transmission of information from one person's mind to another's without using any known hum ...
, which in the late nineteenth century enjoyed popularity (including the interest of scholars such as William James). Some people considered parapsychology to be part of "psychology." Parapsychology, hypnotism, and psychism were major topics at the early International Congresses. But students of these fields were eventually ostracized, and more or less banished from the Congress in 1900–1905. Parapsychology persisted for a time at Imperial University in Japan, with publications such as ''Clairvoyance and Thoughtography'' by Tomokichi Fukurai, but it was mostly shunned by 1913. As a discipline, psychology has long sought to fend off accusations that it is a "soft" science. Philosopher of science
Thomas Kuhn Thomas Samuel Kuhn (; July 18, 1922 – June 17, 1996) was an American philosophy of science, philosopher of science whose 1962 book ''The Structure of Scientific Revolutions'' was influential in both academic and popular circles, introduci ...
's 1962 critique implied psychology overall was in a pre-paradigm state, lacking agreement on the type of overarching theory found in mature sciences such as chemistry and physics. Because some areas of psychology rely on research methods such as surveys and questionnaires, critics asserted that psychology is not an objective science. Skeptics have suggested that personality, thinking, and emotion cannot be directly measured and are often inferred from subjective self-reports, which may be problematic. Experimental psychologists have devised a variety of ways to indirectly measure these elusive phenomenological entities.Peterson, C. (23 May 2009)
"Subjective and objective research in positive psychology: A biological characteristic is linked to well-being"
. ''Psychology Today''. Retrieved 20 April 2010.
Panksepp, J. (1998)
''Affective neuroscience: The foundations of human and animal emotions''
. New York: Oxford University Press, p. 9.
Divisions still exist within the field, with some psychologists more oriented towards the unique experiences of individual humans, which cannot be understood only as data points within a larger population. Critics inside and outside the field have argued that mainstream psychology has become increasingly dominated by a "cult of empiricism," which limits the scope of research because investigators restrict themselves to methods derived from the physical sciences. Feminist critiques have argued that claims to scientific objectivity obscure the values and agenda of (historically) mostly male researchers. Jean Grimshaw, for example, argues that mainstream psychological research has advanced a
patriarchal Patriarchy is a social system in which positions of Dominance hierarchy, dominance and Social privilege, privilege are primarily held by men. It is used, both as a technical Anthropology, anthropological term for families or clans controll ...
agenda through its efforts to control behavior.


Major schools of thought


Biological

Psychologists generally consider biology the substrate of thought and feeling, and therefore an important area of study. Behaviorial neuroscience, also known as biological psychology, involves the application of biological principles to the study of physiological and genetic mechanisms underlying behavior in humans and other animals. The allied field of
comparative psychology Comparative psychology refers to the scientific study of the behavior and mental processes of non-human animals, especially as these relate to the phylogenetic history, adaptive significance, and development of behavior. Research in this area addr ...
is the scientific study of the behavior and mental processes of non-human animals. A leading question in behavioral neuroscience has been whether and how mental functions are localized in the brain. From
Phineas Gage Phineas P. Gage (18231860) was an American railroad construction foreman known for his improbable survival of an accident in which a large iron rod was driven completely through his head, Frontal lobe injury, destroying much of his brain's lef ...
to H.M. and
Clive Wearing Clive Wearing (born 11 May 1938) is a British former musicologist Musicology (from Greek μουσική ''mousikē'' 'music' and -λογια ''-logia'', 'domain of study') is the scholarly analysis and research-based study of music. Music ...
, individual people with mental deficits traceable to physical brain damage have inspired new discoveries in this area.Richard F. Thompson & Stuart M. Zola, "Biological Psychology", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 1: ''History of Psychology''. Modern behavioral neuroscience could be said to originate in the 1870s, when in France
Paul Broca Pierre Paul Broca (, also , , ; 28 June 1824 – 9 July 1880) was a French physician, anatomist Anatomy () is the branch of biology concerned with the study of the structure of organisms and their parts. Anatomy is a branch of natural sc ...
traced production of speech to the left frontal gyrus, thereby also demonstrating hemispheric lateralization of brain function. Soon after,
Carl Wernicke Carl (or Karl) Wernicke (; ; 15 May 1848 – 15 June 1905) was a German physician A physician (American English), medical practitioner (English in the Commonwealth of Nations, Commonwealth English), medical doctor, or simply doctor, is ...
identified a related area necessary for the understanding of speech. The contemporary field of behavioral neuroscience focuses on the physical basis of behavior. Behaviorial neuroscientists use animal models, often relying on rats, to study the neural, genetic, and cellular mechanisms that underlie behaviors involved in learning, memory, and fear responses. Cognitive neuroscientists, by using neural imaging tools, investigate the neural correlates of psychological processes in humans. Neuropsychologists conduct psychological assessments to determine how an individual's behavior and cognition are related to the brain. The
biopsychosocial model Biopsychosocial models are a class of trans-disciplinary models which look at the interconnection between biology, psychology, and Social, socio-environmental factors. These models specifically examine how these aspects play a role in topics rangi ...
is a cross-disciplinary, holistic model that concerns the ways in which interrelationships of biological, psychological, and socio-environmental factors affect health and behavior.
Evolutionary psychology Evolutionary psychology is a theoretical approach in psychology that examines cognition and behavior from a modern evolutionary perspective. It seeks to identify human psychological adaptations with regards to the ancestral problems they evolv ...
approaches thought and behavior from a modern
evolution Evolution is change in the heredity, heritable Phenotypic trait, characteristics of biological populations over successive generations. These characteristics are the Gene expression, expressions of genes, which are passed on from parent to ...
ary perspective. This perspective suggests that psychological adaptations evolved to solve recurrent problems in human ancestral environments. Evolutionary psychologists attempt to find out how human psychological traits are evolved adaptations, the results of
natural selection Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the Heredity, heritable Phenotypic trait, traits characteristic of a populati ...
or
sexual selection Sexual selection is a mode of natural selection in which members of one biological sex mate choice, choose mates of the other sex to mating, mate with (intersexual selection), and compete with members of the same sex for access to members of t ...
over the course of human evolution. The history of the biological foundations of psychology includes evidence of racism. The idea of white supremacy and indeed the modern concept of race itself arose during the process of world conquest by Europeans. Carl von Linnaeus's four-fold classification of humans classifies Europeans as intelligent and severe, Americans as contented and free, Asians as ritualistic, and Africans as lazy and capricious. Race was also used to justify the construction of socially specific mental disorders such as '' drapetomania'' and '' dysaesthesia aethiopica''—the behavior of uncooperative African slaves. After the creation of experimental psychology, "ethnical psychology" emerged as a subdiscipline, based on the assumption that studying primitive races would provide an important link between animal behavior and the psychology of more evolved humans.


Behaviorist

A tenet of behavioral research is that a large part of both human and lower-animal behavior is learned. A principle associated with behavioral research is that the mechanisms involved in learning apply to humans and non-human animals. Behavioral researchers have developed a treatment known as
behavior modification Behavior modification is an early approach that used respondent and operant conditioning Operant conditioning, also called instrumental conditioning, is a learning process where behaviors are modified through the association of stimuli with re ...
, which is used to help individuals replace undesirable behaviors with desirable ones. Early behavioral researchers studied stimulus–response pairings, now known as
classical conditioning Classical conditioning (also known as Pavlovian or respondent conditioning) is a behavioral procedure in which a biologically potent stimulus (e.g. food) is paired with a previously neutral stimulus (e.g. a triangle A triangle is a polyg ...
. They demonstrated that when a biologically potent stimulus (e.g., food that elicits salivation) is paired with a previously neutral stimulus (e.g., a bell) over several learning trials, the neutral stimulus by itself can come to elicit the response the biologically potent stimulus elicits.
Ivan Pavlov Ivan Petrovich Pavlov ( rus, Ива́н Петро́вич Па́влов, , p=ɪˈvan pʲɪˈtrovʲɪtɕ ˈpavləf, a=Ru-Ivan_Petrovich_Pavlov.ogg; 27 February 1936), was a Russian and Soviet experimental neurologist, psychologist and physiolo ...
—known best for inducing dogs to salivate in the presence of a stimulus previously linked with food—became a leading figure in the Soviet Union and inspired followers to use his methods on humans. In the United States,
Edward Lee Thorndike Edward Lee Thorndike (August 31, 1874 – August 9, 1949) was an American psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processes and behavior. ...
initiated "
connectionist Connectionism refers to both an approach in the field of cognitive science that hopes to explain mental phenomena using artificial neural networks (ANN) and to a wide range of techniques and algorithms using ANNs in the context of artificial in ...
" studies by trapping animals in "puzzle boxes" and rewarding them for escaping. Thorndike wrote in 1911, "There can be no moral warrant for studying man's nature unless the study will enable us to control his acts." From 1910 to 1913 the American Psychological Association went through a sea change of opinion, away from
mentalism Mentalism is a performing art in which its practitioners, known as mentalists, appear to demonstrate highly developed mental or intuitive abilities. Performances may appear to include hypnosis, telepathy, clairvoyance, divination, precognition ...
and towards "behavioralism." In 1913, John B. Watson coined the term behaviorism for this school of thought. Watson's famous
Little Albert experiment The Little Albert experiment was a controlled experiment showing empirical evidence of classical conditioning in humans. The study also provides an example of stimulus generalization. It was carried out by John B. Watson and his Doctoral st ...
in 1920 was at first thought to demonstrate that repeated use of upsetting loud noises could instill
phobia A phobia is an anxiety disorder defined by a persistent and excessive fear of an object or situation. Phobias typically result in a rapid onset of fear and are usually present for more than six months. Those affected go to great lengths to avo ...
s (aversions to other stimuli) in an infant human, although such a conclusion was likely an exaggeration.
Karl Lashley Karl Spencer Lashley (June 7, 1890 – August 7, 1958) was a psychologist and behaviorist remembered for his contributions to the study of learning and memory. A ''Review of General Psychology'' survey, published in 2002, ranked Lashley as the 61 ...
, a close collaborator with Watson, examined biological manifestations of learning in the brain. Clark L. Hull, Edwin Guthrie, and others did much to help behaviorism become a widely used paradigm. A new method of "instrumental" or "
operant Operant conditioning, also called instrumental conditioning, is a learning process where behaviors are modified through the association of stimuli with reinforcement or punishment. In it, operants—behaviors that affect one's environment—are c ...
" conditioning added the concepts of
reinforcement In behavioral psychology, reinforcement is a consequence applied that will strengthen an organism's future behavior whenever that behavior is preceded by a specific antecedent stimulus. This strengthening effect may be measured as a higher fr ...
and
punishment Punishment, commonly, is the imposition of an undesirable or suffering, unpleasant outcome upon a group or individual, meted out by an authority—in contexts ranging from child discipline to criminal law—as a response and deterrent to a parti ...
to the model of behavior change. Radical behaviorists avoided discussing the inner workings of the mind, especially the unconscious mind, which they considered impossible to assess scientifically. Operant conditioning was first described by Miller and Kanorski and popularized in the U.S. by B.F. Skinner, who emerged as a leading intellectual of the behaviorist movement.
Noam Chomsky Avram Noam Chomsky (born December 7, 1928) is an American public intellectual: a linguist, philosopher, cognitive scientist, historian, social critic, and political activist. Sometimes called "the father of modern linguistics", Chomsky is ...
published an influential critique of radical behaviorism on the grounds that behaviorist principles could not adequately explain the complex mental process of
language acquisition Language acquisition is the process by which humans acquire the capacity to perceive and comprehend language (in other words, gain the ability to be aware of language and to understand it), as well as to produce and use words and sentence (ling ...
and language use. The review, which was scathing, did much to reduce the status of behaviorism within psychology.
Martin Seligman Martin Elias Peter Seligman (; born August 12, 1942) is an American psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processes and behavior. Their ...
and his colleagues discovered that they could condition in dogs a state of "
learned helplessness Learned helplessness is the behavior exhibited by a subject after enduring repeated aversive stimuli beyond their control. It was initially thought to be caused by the subject's acceptance of their powerlessness, by way of their discontinuing atte ...
", which was not predicted by the behaviorist approach to psychology. Edward C. Tolman advanced a hybrid "cognitive behavioral" model, most notably with his 1948 publication discussing the
cognitive map A cognitive map is a type of mental representation which serves an individual to acquire, code, store, recall, and decode information about the relative locations and attributes of phenomena in their everyday or metaphorical spatial environment. ...
s used by rats to guess at the location of food at the end of a maze. Skinner's behaviorism did not die, in part because it generated successful practical applications. The
Association for Behavior Analysis International The Association for Behavior Analysis International (ABAI) is a nonprofit organization dedicated to promoting behavior analysis. The organization has over 9,000 members. The group organizes conferences and publishes journals on the topic of appl ...
was founded in 1974 and by 2003 had members from 42 countries. The field has gained a foothold in Latin America and Japan.
Applied behavior analysis Applied behavior analysis (ABA), also called behavioral engineering, is an intervention that applies empirical approaches based upon the principles of respondent conditioning, respondent and operant conditioning to change behavior of social sig ...
is the term used for the application of the principles of operant conditioning to change socially significant behavior (it supersedes the term, "behavior modification").


Cognitive

Green Red Blue
Purple Blue Purple ---- Blue Purple Red
Green Purple Green ---- The Stroop effect is the fact that naming the color of the first set of words is easier and quicker than the second.
Cognitive psychology involves the study of
mental process Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of Intellect, intellectual functions and processes such as: perception, attentio ...
es, including
perception Perception () is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment. All perception involves signals that go through the nervous syste ...
,
attention Attention is the behavioral and cognitive process of selectively concentrating on a discrete aspect of information, whether considered subjective or objective, while ignoring other perceivable information. William James (1890) wrote that "A ...
, language comprehension and production,
memory Memory is the faculty of the mind by which data or information is Encoding (memory), encoded, stored, and retrieved when needed. It is the retention of information over time for the purpose of influencing future action. If Foresight (psycholo ...
, and problem solving. Researchers in the field of cognitive psychology are sometimes called cognitivists. They rely on an
information processing Information processing is the change (processing) of information in any manner detectable by an observation, observer. As such, it is a process that ''describes'' everything that happens (changes) in the universe, from the falling of a rock (a ch ...
model of mental functioning. Cognitivist research is informed by functionalism and experimental psychology. Starting in the 1950s, the experimental techniques developed by Wundt, James, Ebbinghaus, and others re-emerged as experimental psychology became increasingly cognitivist and, eventually, constituted a part of the wider, interdisciplinary cognitive science. Some called this development the
cognitive revolution The cognitive revolution was an intellectual movement that began in the 1950s as an interdisciplinary study of the mind and its processes. It later became known collectively as cognitive science. The relevant areas of interchange were between th ...
because it rejected the anti-mentalist dogma of behaviorism as well as the strictures of psychoanalysis.Mandler, G. (2007). A history of modern experimental psychology: From James and Wundt to cognitive science. Cambridge, MA: MIT Press.
Albert Bandura Albert Bandura (; December 4, 1925 – July 26, 2021) was a Canadian-American psychologist who was the David Starr Jordan Professor in Psychology at Stanford University. Bandura was responsible for contributions to the field of education and to ...
helped along the transition in psychology from behaviorism to cognitive psychology. Bandura and other social learning theorists advanced the idea of vicarious learning. In other words, they advanced the view that a child can learn by observing his or her social environment and not necessarily from having been reinforced for enacting a behavior, although they did not rule out the influence of reinforcement on learning a behavior. Technological advances also renewed interest in mental states and mental representations. English neuroscientist
Charles Sherrington Sir Charles Scott Sherrington (27 November 1857 – 4 March 1952) was an eminent English neurophysiologist. His experimental research established many aspects of contemporary neuroscience, including the concept of the spinal reflex as a system ...
and Canadian psychologist Donald O. Hebb used experimental methods to link psychological phenomena to the structure and function of the brain. The rise of computer science, cybernetics, and artificial intelligence underlined the value of comparing information processing in humans and machines. A popular and representative topic in this area is
cognitive bias A cognitive bias is a systematic pattern of deviation from norm (philosophy), norm or rationality in judgment. Individuals create their own "subjective reality" from their perception of the input. An individual's construction of reality, not the ...
, or irrational thought. Psychologists (and economists) have classified and described a sizeable catalogue of biases which recur frequently in human thought. The
availability heuristic The availability heuristic, also known as availability bias, is a mental shortcut that relies on immediate examples that come to a given person's mind when evaluating a specific topic, concept, method, or decision. This heuristics in judgment and d ...
, for example, is the tendency to overestimate the importance of something which happens to come readily to mind. Elements of behaviorism and cognitive psychology were synthesized to form
cognitive behavioral therapy Cognitive behavioral therapy (CBT) is a Psychosocial, psycho-social intervention that aims to reduce symptoms of various mental health conditions, primarily depression and anxiety disorders. CBT focuses on challenging and changing cognitive dis ...
, a form of psychotherapy modified from techniques developed by American psychologist
Albert Ellis Albert Ellis (September 27, 1913 – July 24, 2007) was an American psychologist and psychotherapy, psychotherapist who founded rational emotive behavior therapy (REBT). He held MA and PhD degrees in clinical psychology from Columbia University ...
and American psychiatrist Aaron T. Beck. On a broader level, cognitive science is an interdisciplinary enterprise involving cognitive psychologists, cognitive neuroscientists, linguists, and researchers in artificial intelligence, human–computer interaction, and
computational neuroscience Computational neuroscience (also known as theoretical neuroscience or mathematical neuroscience) is a branch of neuroscience which employs mathematical models, computer simulations, theoretical analysis and abstractions of the brain to u ...
. The discipline of cognitive science covers cognitive psychology as well as philosophy of mind, computer science, and neuroscience. Computer simulations are sometimes used to model phenomena of interest.


Social

Social psychology is concerned with how
behavior Behavior (American English) or behaviour (British English) is the range of Action (philosophy), actions and mannerisms made by individuals, organisms, systems or Artificial Intelligence, artificial entities in some environment. These systems c ...
s,
thought In their most common sense, the terms thought and thinking refer to conscious cognitive Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasse ...
s,
feeling Feelings are Subjectivity, subjective self-contained phenomenal experiences. According to the ''APA Dictionary of Psychology'', a feeling is "a self-contained phenomenal experience"; and feelings are "subjective, evaluative, and independent of t ...
s, and the social environment influence human interactions. Social psychologists study such topics as the influence of others on an individual's behavior (e.g.
conformity Conformity is the act of matching attitudes, beliefs, and behaviors to social group, group Norm (social), norms, politics or being like-minded. Norms are implicit, specific rules, shared by a group of individuals, that guide their interactions wi ...
,
persuasion Persuasion or persuasion arts is an umbrella term In linguistics, semantics, general semantics, and ontology components, ontologies, hyponymy () is a wikt:Wiktionary:Semantic relations, semantic relation between a hyponym denoting a subset ...
) and the formation of beliefs, attitudes, and
stereotype In social psychology, a stereotype is a generalized belief about a particular category of people. It is an expectation that people might have about every person of a particular group. The type of expectation can vary; it can be, for example ...
s about other people.
Social cognition Social cognition is a sub-topic of various branches of psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenomena, in ...
fuses elements of social and cognitive psychology for the purpose of understanding how people process, remember, or distort social information. The study of
group dynamics Group dynamics is a system of behaviors and psychological processes occurring within a social group (''intra''group dynamics), or between social groups (Intergroup relations, ''inter''group dynamics). The study of group dynamics can be useful in un ...
involves research on the nature of leadership, organizational communication, and related phenomena. In recent years, social psychologists have become interested in implicit measures, mediational models, and the interaction of person and social factors in accounting for behavior. Some concepts that
sociologists This is a list of sociologists. It is intended to cover those who have made substantive contributions to social theory and social research, research, including any sociological subfield. Scientists in other fields and philosophers are not included ...
have applied to the study of psychiatric disorders, concepts such as the social role, sick role, social class, life events, culture, migration, and
total institution A total institution is a place of work and residence where a great number of similarly situated people, cut off from the wider community for a considerable time, together lead an enclosed, formally administered round of life. Privacy is limited in ...
, have influenced social psychologists.


Psychoanalytic

Psychoanalysis refers to the theories and therapeutic techniques applied to the unconscious mind and its impact on everyday life. These theories and techniques inform treatments for mental disorders. Psychoanalysis originated in the 1890s, most prominently with the work of
Sigmund Freud Sigmund Freud ( , ; born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist and the founder of psychoanalysis, a clinical method for evaluating and treating psychopathology, pathologies explained as originatin ...
. Freud's psychoanalytic theory was largely based on interpretive methods,
introspection Introspection is the examination of one's own conscious thoughts and feelings. In psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious m ...
, and clinical observation. It became very well known, largely because it tackled subjects such as
sexuality Human sexuality is the way people experience and express themselves Human sexual activity, sexually. This involves biological, psychological, Physical intimacy, physical, erotic, Emotional intimacy, emotional, social, or Spirituality, spiritua ...
, repression, and the unconscious. Freud pioneered the methods of free association and
dream interpretation Dream interpretation is the process of assigning meaning to dreams. Although associated with some forms of psychotherapy, there is no reliable evidence that understanding or interpreting dreams has a positive impact on one's mental health. In m ...
. Psychoanalytic theory is not monolithic. Other well-known psychoanalytic thinkers who diverged from Freud include
Alfred Adler Alfred Adler ( , ; 7 February 1870 – 28 May 1937) was an Austrian medical doctor, psychotherapist, and founder of the school of individual psychology. His emphasis on the importance of feelings of belonging, family constellation and birth order ...
,
Carl Jung Carl Gustav Jung ( ; ; 26 July 1875 – 6 June 1961) was a Swiss psychiatrist and psychoanalyst who founded analytical psychology. Jung's work has been influential in the fields of psychiatry, anthropology, archaeology, literature, philo ...
,
Erik Erikson Erik Homburger Erikson (born Erik Salomonsen; 15 June 1902 – 12 May 1994) was a German-American German Americans (german: Deutschamerikaner, ) are Americans who have full or partial Germans, German ancestry. With an estimated size of appr ...
,
Melanie Klein Melanie Klein (née Reizes; 30 March 1882 – 22 September 1960) was an Austrian-British author and psychoanalysis, psychoanalyst known for her work in child analysis. She was the primary figure in the development of object relations theory. Kle ...
, D.W. Winnicott,
Karen Horney Karen Horney (; ; 16 September 1885 – 4 December 1952) was a German Psychoanalysis, psychoanalyst who practised in the United States during her later career. Her theories questioned some traditional Freudian views. This was particularly true of ...
,
Erich Fromm Erich Seligmann Fromm (; ; March 23, 1900 – March 18, 1980) was a German social psychologist, psychoanalyst, sociologist, humanistic philosopher A philosopher is a person who practices or investigates philosophy Philosophy ...
,
John Bowlby Edward John Mostyn Bowlby, Order of the British Empire, CBE, Fellow of the British Academy, FBA, Royal College of Physicians#Fellowship, FRCP, Royal College of Psychiatrists, FRCPsych (; 26 February 1907 – 2 September 1990) was a British psy ...
, Freud's daughter
Anna Freud Anna Freud CBE (3 December 1895 – 9 October 1982) was a British psychoanalyst of Austrian-Jewish descent. She was born in Vienna Vienna ( ; german: Wien ; bar, Wean, label=Bavarian language, Austro-Bavarian ) is the Capital city, capital, ...
, and
Harry Stack Sullivan Herbert "Harry" Stack Sullivan (February 21, 1892, Norwich (city), New York, Norwich, New York – January 14, 1949, Paris, France) was an American Neo-Freudianism, Neo-Freudian psychiatrist and psychoanalysis, psychoanalyst who held that "persona ...
. These individuals ensured that psychoanalysis would evolve into diverse schools of thought. Among these schools are
ego psychology Ego psychology is a school of psychoanalysis rooted in Sigmund Freud's structural Id, ego, and super-ego, id-ego-superego model of the mind. An individual interacts with the external world as well as responds to internal forces. Many psychoanaly ...
,
object relations Object relations theory is a school of thought in psychoanalytic theory Psychoanalytic theory is the theory of personality organization and the dynamics of personality development that guides psychoanalysis, a clinical method for treating psy ...
, and
interpersonal The concept of interpersonal relationship involves social associations, connections, or affiliations between two or more people. Interpersonal relationships vary in their degree of intimacy or self-disclosure, but also in their duration, in t ...
,
Lacanian Jacques Marie Émile Lacan (, , ; 13 April 1901 – 9 September 1981) was a French psychoanalyst PsychoanalysisFrom Greek language, Greek: + . is a set of Theory, theories and Therapy, therapeutic techniques"What is psychoanalysis? Of co ...
, and
relational psychoanalysis Relational psychoanalysis is a school of psychoanalysis PsychoanalysisFrom Greek: + . is a set of theories and therapeutic techniques"What is psychoanalysis? Of course, one is supposed to answer that it is many things — a theory, a rese ...
. Psychologists such as
Hans Eysenck Hans Jürgen Eysenck (; 4 March 1916 – 4 September 1997) was a German-born British psychologist who spent his professional career in Great Britain. He is best remembered for his work on intelligence and personality psychology, personality, alth ...
and philosophers including
Karl Popper Sir Karl Raimund Popper (28 July 1902 – 17 September 1994) was an Austrian-British philosopher, academic and social commentator. One of the 20th century's most influential philosophers of science, Popper is known for his rejection of the cl ...
sharply criticized psychoanalysis. Popper argued that psychoanalysis had been misrepresented as a scientific discipline,Karl Popper, Conjectures and Refutations, London: Routledge and Keagan Paul, 1963, pp. 33–39; from Theodore Schick, ed., Readings in the Philosophy of Science, Mountain View, CA: Mayfield Publishing Company, 2000, pp. 9–13
Faculty.washington.edu
whereas Eysenck advanced the view that psychoanalytic tenets had been contradicted by
experiment An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried. Experiments provide insight into cause-and-effect by demonstrating what outcome occurs wh ...
al data. By the end of the 20th century, psychology departments in American universities mostly had marginalized Freudian theory, dismissing it as a "desiccated and dead" historical artifact. Researchers such as António Damásio,
Oliver Sacks Oliver Wolf Sacks, (9 July 1933 – 30 August 2015) was a British neurology, neurologist, Natural history, naturalist, historian of science, and writer. Born in Britain, Sacks received his medical degree in 1958 from The Queen's College, Oxfor ...
, and
Joseph LeDoux Joseph E. LeDoux (born December 7, 1949) is an American neuroscientist whose research is primarily focused on survival circuits, including their impacts on emotions such as fear and anxiety. LeDoux is the Henry and Lucy Moses Professor of Science a ...
; and individuals in the emerging field of neuro-psychoanalysis have defended some of Freud's ideas on scientific grounds.


Existential-humanistic

Humanistic psychology Humanistic psychology is a psychological perspective that arose in the mid-20th century in answer to two theories: Sigmund Freud's psychoanalytic theory and B. F. Skinner's behaviorism. Thus, Abraham Maslow established the need for a "third force ...
, which has been influenced by existentialism and phenomenology, stresses
free will Free will is the capacity of agents to choice, choose between different possible courses of Action (philosophy), action unimpeded. Free will is closely linked to the concepts of moral responsibility, praise, culpability, sin, and other judgemen ...
and
self-actualization Self-actualization, in Maslow's hierarchy of needs Maslow's hierarchy of needs is an idea in psychology proposed by American psychologist Abraham Maslow in his 1943 paper "A Theory of Human Motivation" in the journal ''Psychological Review''. Ma ...
.Oxford University Press. (2015). ''A Dictionary of Psychology, 4th ed.'' Edited by Andrew M. Colman. Oxford Reference Online. Oxford: Author. It emerged in the 1950s as a movement within academic psychology, in reaction to both behaviorism and psychoanalysis. The humanistic approach seeks to view the whole person, not just fragmented parts of the personality or isolated cognitions. Humanistic psychology also focuses on personal growth,
self-identity In the psychology of self, one's self-concept (also called self-construction, self-identity, self-perspective or self-structure) is a collection of belief A belief is an Attitude (psychology), attitude that something is the case, or that ...
, death, aloneness, and freedom. It emphasizes subjective meaning, the rejection of determinism, and concern for positive growth rather than pathology. Some founders of the humanistic school of thought were American psychologists
Abraham Maslow Abraham Harold Maslow (; April 1, 1908 – June 8, 1970) was an American psychologist who was best known for creating Maslow's hierarchy of needs, a theory of psychological health predicated on fulfilling innate human needs in priority, cu ...
, who formulated a hierarchy of human needs, and
Carl Rogers Carl Ransom Rogers (January 8, 1902 – February 4, 1987) was an American psychologist and among the founders of the Humanistic psychology, humanistic approach (and Person-centered psychotherapy, client-centered approach) in psychology. Rogers is ...
, who created and developed
client-centered therapy Person-centered therapy, also known as person-centered psychotherapy, person-centered counseling, client-centered therapy and Rogerian psychotherapy, is a form of psychotherapy Psychotherapy (also psychological therapy, talk therapy, or t ...
. Later,
positive psychology Positive psychology is the scientific study of what makes life most worth living, focusing on both individual and societal well-being. It studies "positive subjective experience, positive individual traits, and positive institutions...it aims t ...
opened up humanistic themes to scientific study. Positive psychology is the study of factors which contribute to human happiness and well-being, focusing more on people who are currently healthy. In 2010, ''Clinical Psychological Review'' published a special issue devoted to positive psychological interventions, such as gratitude journaling and the physical expression of gratitude. It is, however, far from clear that positive psychology is effective in making people happier.Ehrenreich, B. (2009). ''Bright-sided: How the relentless promotion of positive thinking has undermined America''. New York: Henry Holt. Singal, J. (2021, June 7). Positive psychology goes to war: How the Army adopted an untested, evidence-free approach to fighting PTSD. ''Chronicle of Higher Education''. Positive psychological interventions have been limited in scope, but their effects are thought to be somewhat better than
placebo A placebo ( ) is a substance or treatment which is designed to have no therapeutic value. Common placebos include inert tablets (like sugar pills), inert injections (like Saline (medicine), saline), sham surgery, and other procedures. In general ...
effects. The ''American Association for Humanistic Psychology'', formed in 1963, declared: Existential psychology emphasizes the need to understand a client's total orientation towards the world. Existential psychology is opposed to reductionism, behaviorism, and other methods that objectify the individual. In the 1950s and 1960s, influenced by philosophers
Søren Kierkegaard Søren Aabye Kierkegaard ( , , ; 5 May 1813 – 11 November 1855) was a Danish theologian, philosopher, poet, social critic, and religious author who is widely considered to be the first Existentialism, existentialist philosopher. He wrote cr ...
and
Martin Heidegger Martin Heidegger (; ; 26 September 188926 May 1976) was a German philosopher who is best known for contributions to Phenomenology (philosophy), phenomenology, hermeneutics, and existentialism. He is among the most important and influential phi ...
, psychoanalytically trained American psychologist
Rollo May Rollo Reece May (April 21, 1909 – October 22, 1994) was an American existential psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processe ...
helped to develop existential psychology.
Existential psychotherapy Existential psychotherapy is a form of psychotherapy Psychotherapy (also psychological therapy, talk therapy, or talking therapy) is the use of Psychology, psychological methods, particularly when based on regular Conversation, personal int ...
, which follows from existential psychology, is a therapeutic approach that is based on the idea that a person's inner conflict arises from that individual's confrontation with the givens of existence. Swiss psychoanalyst Ludwig Binswanger and American psychologist George Kelly may also be said to belong to the existential school. Existential psychologists tend to differ from more "humanistic" psychologists in the former's relatively neutral view of human nature and relatively positive assessment of anxiety. Existential psychologists emphasized the humanistic themes of death, free will, and meaning, suggesting that meaning can be shaped by myths and narratives; meaning can be deepened by the acceptance of free will, which is requisite to living an
authentic Authenticity or authentic may refer to: * Authentication Authentication (from ''authentikos'', "real, genuine", from αὐθέντης ''authentes'', "author") is the act of proof (truth), proving an Logical assertion, assertion, such as the ...
life, albeit often with anxiety with regard to death. Austrian existential psychiatrist and
Holocaust The Holocaust, also known as the Shoah, was the genocide of History of the Jews in Europe, European Jews during World War II. Between 1941 and 1945, Nazi Germany and #Collaboration, its collaborators systematically murdered some Holoc ...
survivor
Viktor Frankl Viktor Emil Frankl (26 March 1905 – 2 September 1997) was an Austrian psychiatrist who founded logotherapy, a school of psychotherapy that describes a search for a life's meaning as the central human motivational force. Logotherapy is part ...
drew evidence of meaning's therapeutic power from reflections upon his own
internment Internment is the imprisonment of people, commonly in large groups, without Criminal charge, charges or Indictment, intent to file charges. The term is especially used for the confinement "of enemy citizens in wartime or of terrorism suspects ...
. He created a variation of existential psychotherapy called
logotherapy Logotherapy was developed by neurologist and psychiatrist A psychiatrist is a physician who specializes in psychiatry, the branch of medicine devoted to the diagnosis, prevention, study, and treatment of mental disorders. Psychiatrists are ...
, a type of
existentialist Existentialism ( ) is a form of philosophy, philosophical inquiry that explores the problem of human existence and centers on human thinking, feeling, and acting. Existentialist thinkers frequently explore issues related to the meaning of life, ...
analysis that focuses on a ''will to meaning'' (in one's life), as opposed to Adler's
Nietzsche Friedrich Wilhelm Nietzsche (; or ; 15 October 1844 – 25 August 1900) was a German philosopher, Prose poetry, prose poet, cultural critic, Philology, philologist, and composer whose work has exerted a profound influence on contemporary philo ...
an doctrine of ''
will to power The will to power (german: der Wille zur Macht) is a concept in the philosophy of Friedrich Nietzsche. The will to power describes what Friedrich Nietzsche, Nietzsche may have believed to be the main driving force in humans. However, the concept ...
'' or Freud's '' will to pleasure''.


Themes


Personality

Personality psychology is concerned with enduring patterns of behavior, thought, and emotion. Theories of personality vary across different psychological schools of thought. Each theory carries different assumptions about such features as the role of the unconscious and the importance of childhood experience. According to Freud, personality is based on the dynamic interactions of the
id, ego, and super-ego The id, ego, and super-ego are a set of three concepts in psychoanalytic theory Psychoanalytic theory is the theory of personality organization and the dynamics of personality development that guides psychoanalysis, a clinical method for trea ...
. By contrast, trait theorists have developed taxonomies of personality constructs in describing personality in terms of key traits. Trait theorists have often employed statistical data-reduction methods, such as
factor analysis Factor analysis is a statistics, statistical method used to describe variance, variability among observed, correlated Variable (mathematics), variables in terms of a potentially lower number of unobserved variables called factors. For example, it ...
. Although the number of proposed traits has varied widely,
Hans Eysenck Hans Jürgen Eysenck (; 4 March 1916 – 4 September 1997) was a German-born British psychologist who spent his professional career in Great Britain. He is best remembered for his work on intelligence and personality psychology, personality, alth ...
's early biologically-based model suggests at least three major trait constructs are necessary to describe human personality, extraversion–introversion,
neuroticism In the study of psychology, neuroticism has been considered a fundamental Trait theory, personality trait. For example, in the Big Five personality traits, Big Five approach to personality trait theory, individuals with high scores for neuroticism ...
-stability, and
psychoticism Psychoticism is one of the three Trait theory, traits used by the psychologist Hans Eysenck in his P–E–N model (psychosis, psychoticism, extraversion and neuroticism) model of personality psychology, personality. Nature Psychoticism is concep ...
-normality.
Raymond Cattell Raymond Bernard Cattell (20 March 1905 – 2 February 1998) was a British-American psychologist, known for his psychometric research into intrapersonal psychological structure.Gillis, J. (2014). ''Psychology's Secret Genius: The Lives and Works ...
empirically derived a theory of
16 personality factors The Sixteen Personality Factor Questionnaire (16PF) is a self-report personality test developed over several decades of empirical research by Raymond Cattell, Raymond B. Cattell, Maurice Tatsuoka and Herbert Eber. The 16PF provides a measure of pe ...
at the primary-factor level and up to eight broader second-stratum factors. Since the 1980s, the Big Five (
openness to experience Openness to experience is one of the domains which are used to describe personality psychology, human personality in the Big Five personality traits, Five Factor Model. Openness involves six Facet (psychology), facets, or dimensions: active imagina ...
,
conscientiousness Conscientiousness is the personality trait of being :wikt:careful, careful, or :wikt:diligent, diligent. Conscientiousness implies a desire to do a task well, and to take obligations to others seriously. Conscientious people tend to be Efficiency, ...
,
extraversion The trait theory, traits of extraversion (also spelled extroversion Retrieved 2018-02-21.) and introversion are a central dimension in some human personality psychology, personality theories. The terms ''introversion'' and ''extraversion'' were ...
,
agreeableness Agreeableness is a trait theory, personality trait manifesting itself in individual behavioral characteristics that are perceived as kind, Sympathy, sympathetic, cooperative, warm, and considerate. In contemporary personality psychology, agreeablen ...
, and
neuroticism In the study of psychology, neuroticism has been considered a fundamental Trait theory, personality trait. For example, in the Big Five personality traits, Big Five approach to personality trait theory, individuals with high scores for neuroticism ...
) emerged as an important trait theory of personality. Dimensional models of personality are receiving increasing support, and a version of dimensional assessment has been included in the DSM-V. However, despite a plethora of research into the various versions of the "Big Five" personality dimensions, it appears necessary to move on from static conceptualizations of personality structure to a more dynamic orientation, acknowledging that personality constructs are subject to learning and change over the lifespan. An early example of personality assessment was the
Woodworth Personal Data Sheet The Woodworth Personal Data Sheet, sometimes known as the Woodworth Psychoneurotic Inventory was a personality test A personality test is a method of assessing human personality construct (psychology), constructs. Most personality assessment inst ...
, constructed during World War I. The popular, although psychometrically inadequate,
Myers–Briggs Type Indicator In Personality type, personality typology, the Myers–Briggs Type Indicator (MBTI) is an introspection, introspective self-report study, self-report questionnaire indicating differing Psychology, psychological preferences in how people perceiv ...
was developed to assess individuals' "personality types" according to the personality theories of Carl Jung. The
Minnesota Multiphasic Personality Inventory The Minnesota Multiphasic Personality Inventory (MMPI) is a Standardized test, standardized Psychometrics, psychometric test of adult Personality psychology, personality and psychopathology. Psychologists and other mental health professionals use ...
(MMPI), despite its name, is more a dimensional measure of psychopathology than a personality measure.
California Psychological Inventory The California Psychological Inventory (CPI) is a self-report inventory A self-report inventory is a type of psychological test in which a person fills out a survey or questionnaire A questionnaire is a research instrument that consists of a ...
contains 20 personality scales (e.g., independence, tolerance). The
International Personality Item Pool The International Personality Item Pool (IPIP) is a public domain The public domain (PD) consists of all the creative work to which no Exclusive exclusive intellectual property rights apply. Those rights may have expired, been forfeited, ex ...
, which is in the public domain, has become a source of scales that can be used personality assessment.


Unconscious mind

Study of the unconscious mind, a part of the psyche outside the individual's awareness but that is believed to influence conscious thought and behavior, was a hallmark of early psychology. In one of the first psychology experiments conducted in the United States, C.S. Peirce and
Joseph Jastrow Joseph Jastrow (January 30, 1863 – January 8, 1944) was a Polish-born American psychologist, noted for inventions in experimental psychology, design of experiments, and psychophysics. He also worked on the phenomena of optical illusions, an ...
found in 1884 that research subjects could choose the minutely heavier of two weights even if consciously uncertain of the difference. Freud popularized the concept of the unconscious mind, particularly when he referred to an uncensored intrusion of unconscious thought into one's speech (a
Freudian slip In psychoanalysis PsychoanalysisFrom Greek: + . is a set of theories and therapeutic techniques"What is psychoanalysis? Of course, one is supposed to answer that it is many things — a theory, a research method, a therapy, a body of kn ...
) or to his efforts to interpret dreams. His 1901 book ''
The Psychopathology of Everyday Life ''Psychopathology of Everyday Life'' (german: Zur Psychopathologie des Alltagslebens) is a 1901 work by Sigmund Freud Sigmund Freud ( , ; born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist and the fou ...
'' catalogues hundreds of everyday events that Freud explains in terms of unconscious influence.
Pierre Janet Pierre Marie Félix Janet (; 30 May 1859 – 24 February 1947) was a pioneering French psychologist, physician, philosopher, and psychotherapist in the field of dissociation (psychology), dissociation and Psychological trauma, traumatic me ...
advanced the idea of a subconscious mind, which could contain autonomous mental elements unavailable to the direct scrutiny of the subject.John F. Kihlstrom,
The Psychological Unconscious
", in Lawrence Pervin & Oliver John (eds.), ''Handbook of Personality''; New York: Guilford Press, 1999. Also se

.
The concept of unconscious processes has remained important in psychology. Cognitive psychologists have used a "filter" model of attention. According to the model, much information processing takes place below the threshold of consciousness, and only certain stimuli, limited by their nature and number, make their way through the filter. Much research has shown that subconscious ''
priming Priming may refer to: * Priming (agriculture), a form of seed planting preparation, in which seeds are soaked before planting * Priming (immunology), a process occurring when a specific antigen is presented to naive lymphocytes causing them to di ...
'' of certain ideas can covertly influence thoughts and behavior. Because of the unreliability of self-reporting, a major hurdle in this type of research involves demonstrating that a subject's conscious mind has not perceived a target stimulus. For this reason, some psychologists prefer to distinguish between '' implicit'' and '' explicit'' memory. In another approach, one can also describe a subliminal stimulus as meeting an ''objective'' but not a ''subjective'' threshold.William P. Banks & Ilya Farber, "Consciousness", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 4: ''Experimental Psychology''. The
automaticity Automaticity is the ability to do things without occupying the mind with the low-level details required, allowing it to become an automatic response pattern or habit (psychology), habit. It is usually the result of learning, repetition (learning) ...
model of
John Bargh John A. Bargh (; born 1955) is a social psychologist currently working at Yale University, where he has formed the Automaticity in Cognition, Motivation, and Evaluation (ACME) Laboratory. Bargh's work focuses on automaticity and unconscious proce ...
and others involves the ideas of automaticity and unconscious processing in our understanding of
social behavior Social behavior is behavior among two or more organisms within the same species, and encompasses any behavior in which one member affects the other. This is due to an interaction among those members. Social behavior can be seen as similar to an ...
, Also see: John A. Bargh, "The Automaticity of Everyday Life", in Robert S. Wyer Jr. (ed.), ''The Automaticity of Everyday Life'', Advances in Social Cognition, Volume X; Mahwah, NJ: Lawrence Erlbaum Associates, 1997; John F. Kihlstrom,
The Automaticity Juggernaut—or, Are We Automatons After All?
", in John Baer, James C. Kaufmna, & Roy F. Baumeister (eds.), ''Are We Free? Psychology and Free Will''; Oxford University Press, 2008.
although there has been dispute with regard to replication.S. Doyen, O. Klein, C. L. Pichon and A. Cleeremans. (2012). Behavioral priming: it's all in the mind, but whose mind? ''PLoS One'', 7
e29081
Some experimental data suggest that the brain begins to consider taking actions before the mind becomes aware of them. The influence of unconscious forces on people's choices bears on the philosophical question of free will. John Bargh,
Daniel Wegner Daniel Merton Wegner (June 28, 1948 – July 5, 2013) was an American social psychologist. He was a professor of psychology at Harvard University Harvard University is a Private university, private Ivy League research university in Cambri ...
, and
Ellen Langer Ellen Jane Langer (; born March 25, 1947) is an American professor of psychology at Harvard University; in 1981, she became the first woman ever to be tenured in psychology at Harvard. Langer studies the illusion of control, decision-making, agi ...
describe free will as an illusion.


Motivation

Some psychologists study motivation or the subject of why people or lower animals initiate a behavior at a particular time. It also involves the study of why humans and lower animals continue or terminate a behavior. Psychologists such as William James initially used the term ''motivation'' to refer to intention, in a sense similar to the concept of ''
will Will may refer to: Common meanings * Will and testament A will or testament is a legal document that expresses a person's (testator) wishes as to how their property (estate (law), estate) is to be distributed after their death and as to which ...
'' in European philosophy. With the steady rise of Darwinian and Freudian thinking, instinct also came to be seen as a primary source of motivation.Forgas, Williams, & Laham, "Social Motivation: Introduction and Overview", in Forgas, Williams, & Laham, ''Social Motivation'' (2005). According to
drive theory In psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenomena, including feelings and thoughts. It is an academic dis ...
, the forces of instinct combine into a single source of energy which exerts a constant influence. Psychoanalysis, like biology, regarded these forces as demands originating in the nervous system. Psychoanalysts believed that these forces, especially the sexual instincts, could become entangled and transmuted within the psyche. Classical psychoanalysis conceives of a struggle between the pleasure principle and the
reality principle In Sigmund Freud, Freudian psychology and psychoanalysis, the reality principle (german: Realitätsprinzip) is the ability of the mind to assess the reality of the external world, and to act upon it accordingly, as opposed to acting on the Pleasure ...
, roughly corresponding to id and ego. Later, in '' Beyond the Pleasure Principle'', Freud introduced the concept of the ''
death drive In classical Freudian psychoanalytic theory, the death drive (german: Todestrieb) is the drive toward death and destruction, often expressed through behaviors such as aggression, repetition compulsion, and self-destructiveness.Eric Berne, ' ...
'', a compulsion towards aggression, destruction, and psychic repetition of traumatic events. Meanwhile, behaviorist researchers used simple dichotomous models (pleasure/pain, reward/punishment) and well-established principles such as the idea that a thirsty creature will take pleasure in drinking.Bill P. Godsil, Matthew R. Tinsley, & Michael S. Fanselow, "Motivation", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 4: ''Experimental Psychology''.
Clark Hull Clark Leonard Hull (May 24, 1884 – May 10, 1952) was an American psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processes and behavior. Their ...
formalized the latter idea with his drive reduction model. Hunger, thirst, fear, sexual desire, and thermoregulation constitute fundamental motivations in animals. Humans seem to exhibit a more complex set of motivations—though theoretically these could be explained as resulting from desires for belonging, positive self-image, self-consistency, truth, love, and control. Motivation can be modulated or manipulated in many different ways. Researchers have found that
eating Eating (also known as consuming) is the ingestion of food, typically to provide a heterotrophic organism with food energy, energy and to allow for :wikt:growth, growth. Animals and other heterotrophs must eat in order to survive — carnivor ...
, for example, depends not only on the organism's fundamental need for
homeostasis In biology, homeostasis ( British also homoeostasis) (/hɒmɪə(ʊ)ˈsteɪsɪs/) is the state of steady internal, physical, and chemical conditions maintained by living systems. This is the condition of optimal functioning for the organism ...
—an important factor causing the experience of hunger—but also on circadian rhythms, food availability, food palatability, and cost. Abstract motivations are also malleable, as evidenced by such phenomena as ''goal contagion'': the adoption of goals, sometimes unconsciously, based on inferences about the goals of others. Vohs and Baumeister suggest that contrary to the need-desire-fulfilment cycle of animal instincts, human motivations sometimes obey a "getting begets wanting" rule: the more you get a reward such as self-esteem, love, drugs, or money, the more you want it. They suggest that this principle can even apply to food, drink, sex, and sleep.


Development psychology

Developmental psychology refers to the scientific study of how and why the thought processes, emotions, and behaviors of humans change over the course of their lives. Some credit Charles Darwin with conducting the first systematic study within the rubric of developmental psychology, having published in 1877 a short paper detailing the development of innate forms of communication based on his observations of his infant son. The main origins of the discipline, however, are found in the work of
Jean Piaget Jean William Fritz Piaget (, , ; 9 August 1896 – 16 September 1980) was a Switzerland, Swiss psychologist known for his work on child development. Piaget's Piaget's theory of cognitive development, theory of cognitive development and epistemol ...
. Like Piaget, developmental psychologists originally focused primarily on the development of cognition from infancy to adolescence. Later, developmental psychology extended itself to the study cognition over the life span. In addition to studying cognition, developmental psychologists have also come to focus on affective, behavioral, moral, social, and neural development. Developmental psychologists who study children use a number of research methods. For example, they make observations of children in natural settings such as preschools and engage them in experimental tasks. Such tasks often resemble specially designed games and activities that are both enjoyable for the child and scientifically useful. Developmental researchers have even devised clever methods to study the mental processes of infants. In addition to studying children, developmental psychologists also study aging and processes throughout the life span, including old age. These psychologists draw on the full range of psychological theories to inform their research.Crain, W. (2014). ''Theories of development: Concepts and applications. 6th ed.'' Edinburgh: Pearson.


Genes and environment

All researched psychological traits are influenced by both
genes In biology Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. For instance, all organisms are made up of Cell (biology) ...
and environment, to varying degrees. These two sources of influence are often confounded in observational research of individuals and families. An example of this confounding can be shown in the transmission of depression from a depressed mother to her offspring. A theory based on environmental transmission would hold that an offspring, by virtue of his or her having a problematic rearing environment managed by a depressed mother, is at risk for developing depression. On the other hand, a hereditarian theory would hold that depression risk in an offspring is influenced to some extent by genes passed to the child from the mother. Genes and environment in these simple transmission models are completely confounded. A depressed mother may both carry genes that contribute to depression in her offspring and also create a rearing environment that increases the risk of depression in her child.
Behavioral genetics Behavioural genetics, also referred to as behaviour genetics, is a field of science, scientific research that uses genetics, genetic scientific method, methods to investigate the etiology, nature and origins of Differential psychology, indivi ...
researchers have employed methodologies that help to disentangle this confound and understand the nature and origins of individual differences in behavior. Traditionally the research has involved
twin studies Twin studies are studies conducted on Identical twin, identical or Fraternal twin, fraternal twins. They aim to reveal the importance of environmental and genetics, genetic influences for traits, phenotypes, and disorders. Twin research is consid ...
and adoption studies, two designs where genetic and environmental influences can be partially un-confounded. More recently, gene-focused research has contributed to understanding genetic contributions to the development of psychological traits. The availability of
microarray A microarray is a multiplex lab-on-a-chip. Its purpose is to simultaneously detect the expression of thousands of genes from a sample (e.g. from a tissue). It is a two-dimensional array on a solid substrate—usually a glass slide or silic ...
molecular genetic or
genome sequencing Whole genome sequencing (WGS), also known as full genome sequencing, complete genome sequencing, or entire genome sequencing, is the process of determining the entirety, or nearly the entirety, of the DNA sequence of an organism's genome at a s ...
technologies allows researchers to measure participant DNA variation directly, and test whether individual genetic variants within genes are associated with psychological traits and
psychopathology Psychopathology is the study of abnormal cognition, behaviour, and experiences which differs according to social norms and rests upon a number of constructs that are deemed to be the social norm at any particular era. Biological psychopathol ...
through methods including
genome-wide association studies In genomics, a genome-wide association study (GWA study, or GWAS), also known as whole genome association study (WGA study, or WGAS), is an observational study of a genome-wide set of Single-nucleotide polymorphism, genetic variants in different i ...
. One goal of such research is similar to that in
positional cloning A genetic screen or mutagenesis screen is an experimental technique used to identify and select individuals who possess a phenotype of interest in a mutagenized population. Hence a genetic screen is a type of phenotypic screen. Genetic screens c ...
and its success in
Huntington's Huntington's disease (HD), also known as Huntington's chorea, is a neurodegenerative disease A neurodegenerative disease is caused by the progressive loss of structure or function of neurons, in the process known as neurodegeneration. Su ...
: once a causal gene is discovered biological research can be conducted to understand how that gene influences the phenotype. One major result of genetic association studies is the general finding that psychological traits and psychopathology, as well as complex medical diseases, are highly
polygenic A polygene is a member of a group of non-Epistasis, epistatic genes that interact additively to influence a phenotype, phenotypic trait, thus contributing to multiple-gene inheritance (polygenic inheritance, multigenic inheritance, quantitative in ...
, where a large number (on the order of hundreds to thousands) of genetic variants, each of small effect, contribute to individual differences in the behavioral trait or propensity to the disorder. Active research continues to work toward understanding the genetic and environmental bases of behavior and their interaction.


Applications

Psychology encompasses many subfields and includes different approaches to the study of mental processes and behavior.


Psychological testing

Psychological testing has ancient origins, dating as far back as 2200 BC, in the examinations for the Chinese civil service. Written exams began during the Han dynasty (202 BC – AD 200). By 1370, the Chinese system required a stratified series of tests, involving essay writing and knowledge of diverse topics. The system was ended in 1906. In Europe, mental assessment took a different approach, with theories of
physiognomy Physiognomy (from the Greek Language, Greek , , meaning "nature", and , meaning "judge" or "interpreter") is the practice of assessing a person's character or personality from their outer appearance—especially the face. The term can also refer ...
—judgment of character based on the face—described by Aristotle in 4th century BC Greece. Physiognomy remained current through the Enlightenment, and added the doctrine of phrenology: a study of mind and intelligence based on simple assessment of neuroanatomy. When experimental psychology came to Britain, Francis Galton was a leading practitioner. By virtue of his procedures for measuring reaction time and sensation, he is considered an inventor of modern mental testing (also known as ''
psychometrics Psychometrics is a field of study within psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenomena, including fe ...
''). James McKeen Cattell, a student of Wundt and Galton, brought the idea of psychological testing to the United States, and in fact coined the term "mental test". In 1901, Cattell's student Clark Wissler published discouraging results, suggesting that mental testing of Columbia and Barnard students failed to predict academic performance. In response to 1904 orders from the Minister of Public Instruction, French psychologists
Alfred Binet Alfred Binet (; 8 July 1857 – 18 October 1911), born Alfredo Binetti, was a French psychologist A psychologist is a professional who practices psychology and studies mental states, perceptual, cognitive, emotional, and social processe ...
and Théodore Simon developed and elaborated a new test of intelligence in 1905–1911. They used a range of questions diverse in their nature and difficulty. Binet and Simon introduced the concept of
mental age Mental age is a concept related to intelligence. It looks at how a specific individual, at a specific age, performs intellectually, compared to average intellectual performance for that individual's actual chronological age (i.e. time elapsed sin ...
and referred to the lowest scorers on their test as ''
idiot An idiot, in modern use, is a stupid or foolish person. 'Idiot' was formerly a technical term in legal and psychiatric contexts for some kinds of profound intellectual disability Intellectual disability (ID), also known as general learning ...
s''. Henry H. Goddard put the Binet-Simon scale to work and introduced classifications of mental level such as ''imbecile'' and ''feebleminded''. In 1916, (after Binet's death), Stanford professor Lewis M. Terman modified the Binet-Simon scale (renamed the Stanford–Binet scale) and introduced the
intelligence quotient An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. The abbreviation "IQ" was coined by the psychologist William Stern (psychologist), William Stern for th ...
as a score report. Based on his test findings, and reflecting the racism common to that era, Terman concluded that intellectual disability "represents the level of intelligence which is very, very common among Spanish-Indians and Mexican families of the Southwest and also among negroes. Their dullness seems to be racial."Guthrie, ''Even the Rat was White'' (1998), Chapter 3: "Psychometric Scientism" (pp. 55–87) Following the Army Alpha and Army Beta tests, which was developed by psychologist
Robert Yerkes Robert Mearns Yerkes (; May 26, 1876 – February 3, 1956) was an American psychologist, ethologist, Eugenics, eugenicist and Primatology, primatologist best known for his work in intelligence testing and in the field of comparative psychology. ...
in 1917 and then used in World War 1 by industrial and organizational psychologists for large-scale employee testing and selection of military personnel. Mental testing also became popular in the U.S., where it was applied to schoolchildren. The federally created National Intelligence Test was administered to 7 million children in the 1920s. In 1926, the
College Entrance Examination Board The College Board is an American nonprofit organization A nonprofit organization (NPO) or non-profit organisation, also known as a non-business entity, not-for-profit organization, or nonprofit institution, is a legal entity organized a ...
created the
Scholastic Aptitude Test The SAT ( ) is a standardized test A standardized test is a Test (assessment), test that is administered and scored in a consistent, or "standard", manner. Standardized tests are designed in such a way that the questions and interpretations ...
to standardize college admissions. The results of intelligence tests were used to argue for segregated schools and economic functions, including the preferential training of Black Americans for manual labor. These practices were criticized by Black intellectuals such a
Horace Mann Bond Horace Mann Bond (November 8, 1904 – December 21, 1972) was an American historian, college administrator, social science researcher and the father A father is the male parent of a child. Besides the paternal bonds of a father to his c ...
and Allison Davis. Eugenicists used mental testing to justify and organize compulsory sterilization of individuals classified as mentally retarded (now referred to as ''
intellectual disability Intellectual disability (ID), also known as general learning disability in the United Kingdom and formerly mental retardation,Rosa's Law, Pub. L. 111-256124 Stat. 2643(2010). is a generalized neurodevelopmental disorder characterized by signific ...
''). In the United States, tens of thousands of men and women were sterilized. Setting a precedent that has never been overturned, the U.S. Supreme Court affirmed the constitutionality of this practice in the 1927 case '' Buck v. Bell''. Today mental testing is a routine phenomenon for people of all ages in Western societies. Modern testing aspires to criteria including standardization of procedure, consistency of results, output of an interpretable score, statistical norms describing population outcomes, and, ideally, effective prediction of behavior and life outcomes outside of testing situations. Psychological testing is regularly used in forensic contexts to aid legal judgments and decisions. Developments in psychometrics include work on test and scale
reliability Reliability, reliable, or unreliable may refer to: Science, technology, and mathematics Computing * Data reliability (disambiguation), a property of some disk arrays in computer storage * High availability * Reliability (computer networking), a ...
and validity. Developments in item-response theory,
structural equation modeling Structural equation modeling (SEM) is a label for a diverse set of methods used by scientists in both experimental and observational research across the sciences, business, and other fields. It is used most in the social and behavioral scienc ...
, and bifactor analysis have helped in strengthening test and scale construction.


Mental health care

The provision of psychological health services is generally called clinical psychology in the U.S. Sometimes, however, members of the school psychology and counseling psychology professions engage in practices that resemble that of clinical psychologists. Clinical psychologists typically include people who have graduated from doctoral programs in clinical psychology. In Canada, some of the members of the abovementioned groups usually fall within the larger category of
professional psychology The ''Professional Psychology: Research and Practice'' is a peer-reviewed, English language journal published six times per year by the American Psychological Association The American Psychological Association (APA) is the largest scientific a ...
. In Canada and the U.S., practitioners get bachelor's degrees and doctorates; doctoral students in clinical psychology usually spend one year in a predoctoral internship and one year in postdoctoral internship. In Mexico and most other Latin American and European countries, psychologists do not get bachelor's and doctoral degrees; instead, they take a three-year professional course following high school. Clinical psychology is at present the largest specialization within psychology. It includes the study and application of psychology for the purpose of understanding, preventing, and relieving psychological distress, dysfunction, and/or
mental illness A mental disorder, also referred to as a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. Such features may be persistent, relapsing and remitti ...
. Clinical psychologists also try to promote subjective well-being and personal growth. Central to the practice of clinical psychology are psychological assessment and psychotherapy although clinical psychologists may also engage in research, teaching, consultation, forensic testimony, and program development and administration.Brain, Christine. (2002). ''Advanced psychology: applications, issues and perspectives.'' Cheltenham: Nelson Thornes. Credit for the first psychology clinic in the United States typically goes to
Lightner Witmer Lightner Witmer (June 28, 1867 – July 19, 1956) was an American psychologist. He introduced the term "Clinical Psychology, clinical psychology" and is often credited with founding the field that it describes. Witmer created the world's first "ps ...
, who established his practice in Philadelphia in 1896. Another modern psychotherapist was Morton Prince, an early advocate for the establishment of psychology as a clinical and academic discipline.George Stricker & Thomas A. Widiger, "Volume Preface", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 8: ''Clinical Psychology''. In the first part of the twentieth century, most mental health care in the United States was performed by psychiatrists, who are medical doctors. Psychology entered the field with its refinements of mental testing, which promised to improve the diagnosis of mental problems. For their part, some psychiatrists became interested in using
psychoanalysis PsychoanalysisFrom Greek: + . is a set of theories and therapeutic techniques"What is psychoanalysis? Of course, one is supposed to answer that it is many things — a theory, a research method, a therapy, a body of knowledge. In what might ...
and other forms of
psychodynamic psychotherapy Psychodynamic psychotherapy or psychoanalytic psychotherapy is a form of psychological therapy. Its primary focus is to reveal the Unconscious mind, unconscious content of a client's psyche in an effort to alleviate psychic tension, which is i ...
to understand and treat the mentally ill. Psychotherapy as conducted by psychiatrists blurred the distinction between psychiatry and psychology, and this trend continued with the rise of community mental health facilities. Some in the clinical psychology community adopted
behavioral therapy Behaviour therapy or behavioural psychotherapy is a broad term referring to clinical psychotherapy that uses techniques derived from behaviorism, behaviourism and/or cognitive therapy, cognitive psychology. It looks at specific, learned behaviours ...
, a thoroughly non-psychodynamic model that used behaviorist learning theory to change the actions of patients. A key aspect of behavior therapy is empirical evaluation of the treatment's effectiveness. In the 1970s, cognitive-behavior therapy emerged with the work of
Albert Ellis Albert Ellis (September 27, 1913 – July 24, 2007) was an American psychologist and psychotherapy, psychotherapist who founded rational emotive behavior therapy (REBT). He held MA and PhD degrees in clinical psychology from Columbia University ...
and
Aaron Beck Aaron Temkin Beck (July 18, 1921 – November 1, 2021) was an American psychiatrist A psychiatrist is a physician who specializes in psychiatry, the branch of medicine devoted to the diagnosis, prevention, study, and treatment of menta ...
. Although there are similarities between behavior therapy and cognitive-behavior therapy, cognitive-behavior therapy required the application of cognitive constructs. Since the 1970s, the popularity of cognitive-behavior therapy among clinical psychologists increased. A key practice in behavioral ''and'' cognitive-behavioral therapy is exposing patients to things they fear, based on the premise that their responses (fear, panic, anxiety) can be deconditioned. Mental health care today involves psychologists and
social work Social work is an academic discipline and practice-based professional learning, practice-based profession concerned with meeting the basic needs of individuals, Family, families, social group, groups, communities, and society as a whole to enhan ...
ers in increasing numbers. In 1977, National Institute of Mental Health director Bertram Brown described this shift as a source of "intense competition and role confusion."Nancy Tomes, "The Development of Clinical Psychology, Social Work, and Psychiatric Nursing: 1900–1980s", in Wallace & Gach (eds.), ''History of Psychiatry and Medical Psychology'' (2008). Graduate programs issuing doctorates in clinical psychology emerged in the 1950s and underwent rapid increase through the 1980s. The PhD degree is intended to train practitioners who could also conduct scientific research. The PsyD degree is more exclusively designed to train practitioners. Some clinical psychologists focus on the clinical management of patients with brain injury. This subspecialty is known as
clinical neuropsychology Clinical neuropsychology is a sub-field of psychology concerned with the applied science of brain-behaviour relationships. Clinical neuropsychologists use this knowledge in the assessment, diagnosis, treatment, and or rehabilitation of patients ...
. In many countries, clinical psychology is a regulated mental health profession. The emerging field of ''disaster psychology'' (see crisis intervention) involves professionals who respond to large-scale traumatic events. The work performed by clinical psychologists tends to be influenced by various therapeutic approaches, all of which involve a formal relationship between professional and client (usually an individual, couple, family, or small group). Typically, these approaches encourage new ways of thinking, feeling, or behaving. Four major theoretical perspectives are psychodynamic, cognitive behavioral, existential–humanistic, and systems or family therapy. There has been a growing movement to integrate the various therapeutic approaches, especially with an increased understanding of issues regarding culture, gender, spirituality, and sexual orientation. With the advent of more robust research findings regarding psychotherapy, there is evidence that most of the major therapies have equal effectiveness, with the key common element being a strong therapeutic alliance. Because of this, more training programs and psychologists are now adopting an eclectic therapeutic orientation. Diagnosis in clinical psychology usually follows the ''Diagnostic and Statistical Manual of Mental Disorders'' (DSM). The study of mental illnesses is called
abnormal psychology Abnormal psychology is the branch of psychology that studies unusual patterns of behavior, emotion, and thought, which could possibly be understood as a mental disorder. Although many behaviors could be considered as abnormality (behavior), abnorm ...
.


Education

Educational psychology Educational psychology is the branch of psychology Psychology is the science, scientific study of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenomena, including feelings ...
is the study of how humans learn in educational settings, the effectiveness of educational interventions, the psychology of teaching, and the social psychology of
school A school is an educational institution designed to provide learning spaces and learning environments for the teaching of students under the direction of teachers. Most countries have systems of formal education, which is sometimes compulsor ...
s as organizations. Educational psychologists can be found in preschools, schools of all levels including post secondary institutions, community organizations and learning centers, Government or private research firms, and independent or private consultant Madisonodell5/sandbox. The work of developmental psychologists such as Lev Vygotsky,
Jean Piaget Jean William Fritz Piaget (, , ; 9 August 1896 – 16 September 1980) was a Switzerland, Swiss psychologist known for his work on child development. Piaget's Piaget's theory of cognitive development, theory of cognitive development and epistemol ...
, and
Jerome Bruner Jerome Seymour Bruner (October 1, 1915 – June 5, 2016) was an American psychologist who made significant contributions to human cognitive psychology and cognitive learning theory (education), learning theory in educational psychology. Bruner was ...
has been influential in creating teaching methods and educational practices. Educational psychology is often included in teacher education programs in places such as North America, Australia, and New Zealand. School psychology combines principles from educational psychology and clinical psychology to understand and treat students with learning disabilities; to foster the intellectual growth of
gifted Intellectual giftedness is an Intelligence, intellectual ability significantly higher than average. It is a characteristic of children, variously defined, that motivates differences in school programming. It is thought to persist as a trait into a ...
students; to facilitate
prosocial behavior Prosocial behavior, or intent to benefit others, is a social behavior that "benefit other people or society as a whole", "such as helping, sharing, donating, co-operating, and volunteering". Obeying the rules and conforming to socially accepted ...
s in adolescents; and otherwise to promote safe, supportive, and effective learning environments. School psychologists are trained in educational and behavioral assessment, intervention, prevention, and consultation, and many have extensive training in research.


Work

Industrial and organizational (I/O) psychology involves research and practices that apply psychological theories and principles to organizations and individuals' work-lives. In the field's beginnings, industrialists brought the nascent field of psychology to bear on the study of
scientific management Scientific management is a theory of management that Analysis, analyzes and wikt:synthesis#Noun, synthesizes workflows. Its main objective is improving economic efficiency, especially Workforce productivity, labor productivity. It was one of the ...
techniques for improving workplace efficiency. The field was at first called ''economic psychology'' or ''business psychology''; later, ''industrial psychology'', ''employment psychology'', or ''psychotechnology''.Laura L. Koppes, "Industrial-Organizational Psychology", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 1: ''History of Psychology''. An influential early study examined workers at Western Electric's Hawthorne plant in Cicero, Illinois from 1924 to 1932. Western Electric experimented on factory workers to assess their responses to changes in illumination, breaks, food, and wages. The researchers came to focus on workers' responses to observation itself, and the term
Hawthorne effect The Hawthorne effect is a type of reactivity (psychology), reactivity in which individuals modify an aspect of their behavior in response to their awareness of being observed. The effect was discovered in the context of research conducted at the Ha ...
is now used to describe the fact that people's behavior can change when they think they're being observed. Although the Hawthorne research can be found in psychology textbooks, the research and its findings were weak at best. The name industrial and organizational psychology emerged in the 1960s. In 1973, it became enshrined in the name of the
Society for Industrial and Organizational Psychology The Society for Industrial and Organizational Psychology (SIOP) is a professional organization A professional association (also called a professional body, professional organization, or professional society) usually seeks to advocacy, further ...
, Division 14 of the American Psychological Association. One goal of the discipline is to optimize human potential in the workplace. Personnel psychology is a subfield of I/O psychology. Personnel psychologists apply the methods and principles of psychology in selecting and evaluating workers. Another subfield,
organizational psychology Industrial and organizational psychology (I-O psychology), an applied discipline within psychology, is the science of human behavior in the workplace. Depending on the country or region of the world, I-O psychology is also known as occupational ...
, examines the effects of work environments and management styles on worker motivation, job satisfaction, and productivity. Most I/O psychologists work outside of academia, for private and public organizations and as consultants. A psychology consultant working in business today might expect to provide executives with information and ideas about their industry, their target markets, and the organization of their company. Organizational behavior (OB) is an allied field involved in the study of human behavior within organizations. One way to differentiate I/O psychology from OB is to note that I/O psychologists train in university psychology departments and OB specialists, in business schools.


Military and intelligence

One role for psychologists in the military has been to evaluate and counsel soldiers and other personnel. In the U.S., this function began during World War I, when Robert Yerkes established the School of Military Psychology at Fort Oglethorpe in Georgia. The school provided psychological training for military staff. Today, U.S. Army psychologists perform psychological screening, clinical psychotherapy,
suicide prevention Suicide prevention is a collection of efforts to reduce the risk of suicide. Suicide is often preventable, and the efforts to prevent it may occur at the individual, relationship, community, and society level. Suicide is a serious public health ...
, and treatment for post-traumatic stress, as well as provide prevention-related services, for example, smoking cessation. The United States Army's Mental Health Advisory Teams implement psychological interventions to help combat troops experiencing mental problems. Psychologists may also work on a diverse set of campaigns known broadly as psychological warfare. Psychological warfare chiefly involves the use of propaganda to influence enemy soldiers and civilians. This so-called black propaganda is designed to seem as if it originates from a source other than the Army. The
CIA The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian foreign intelligence service of the federal government of the United States The federal government of the United ...
's
MKULTRA Project MKUltra (or MK-Ultra) was an illegal Unethical human experimentation in the United States, human experimentation program designed and undertaken by the U.S. Central Intelligence Agency (CIA), intended to develop procedures and identi ...
program involved more individualized efforts at
mind control Brainwashing (also known as mind control, menticide, coercive persuasion, thought control, thought reform, and forced re-education) is the concept that the human mind can be altered or controlled by certain psychological techniques. Brainwashin ...
, involving techniques such as hypnosis, torture, and covert involuntary administration of
LSD Lysergic acid diethylamide (LSD), also known colloquially as acid, is a potent psychedelic drug. Effects typically include intensified thoughts, emotions, and sensory perception. At sufficiently high dosages LSD manifests primarily mental, vi ...
. The U.S. military used the name Psychological Operations (PSYOP) until 2010, when these activities were reclassified as Military Information Support Operations (MISO), part of
Information Operations Information Operations is a category of direct and indirect support operations for the United States Military. By definition in Joint Publication 3-13, "IO are described as the integrated employment of electronic warfare (EW), computer networ ...
(IO). Psychologists have sometimes been involved in assisting the interrogation and torture of suspects, staining the records of the psychologists involved.


Health, well-being, and social change


Social change

An example of the contribution of psychologists to social change involves the research of
Kenneth Kenneth is an English given name A given name (also known as a forename or first name) is the part of a personal name quoted in that identifies a person, potentially with a middle name as well, and differentiates that person from the oth ...
and Mamie Phipps Clark. These two African American psychologists studied segregation's adverse psychological impact on Black children. Their research findings played a role in the desegregation case '' Brown v. Board of Education'' (1954). The impact of psychology on social change includes the discipline's broad influence on teaching and learning. Research has shown that compared to the "whole word" or "whole language" approach, the phonics approach to reading instruction is more efficacious.


Medical applications

Medical facilities increasingly employ psychologists to perform various roles. One aspect of health psychology is the
psychoeducation Psychoeducation (a portmanteau A portmanteau word, or portmanteau (, ) is a Blend word, blend of words
s of people.


Worker health, safety and wellbeing

Psychologists work with organizations to apply findings from psychological research to improve the health and well-being of employees. Some work as external consultants hired by organizations to solve specific problems, whereas others are full-time employees of the organization. Applications include conducting surveys to identify issues and designing interventions to make work healthier. Some of the specific health areas include: *Accidents and injuries: A major contribution is the concept of safety climate, which is employee shared perceptions of the behaviors that are encouraged (e.g., wearing safety gear) and discouraged (not following safety rules) at work. Organizations with strong safety climates have fewer work accidents and injuries. *
Cardiovascular disease Cardiovascular disease (CVD) is a class of diseases that involve the heart or blood vessels. CVD includes coronary artery diseases (CAD) such as angina pectoris, angina and myocardial infarction (commonly known as a heart attack). Other CVDs in ...
: Cardiovascular disease has been related to lack of Job control (workplace), job control. *Mental health: Exposure to occupational stress is associated with mental health disorder. *Musculoskeletal disorder: These are injuries in bones, nerves and tendons due to overexertion and repetitive strain. They have been linked to job satisfaction and workplace stress. *Physical health symptoms: Occupational stress has been linked to physical symptoms such as digestive distress and headache. *Workplace violence: Violence prevention climate is related to being physically assaulted and psychologically mistreated at work. Interventions that improve climates are a way to address accidents and violence. Interventions that reduce stress at work or provide employees with tools to better manage it can help in areas where stress is an important component. Industrial psychology became interested in worker fatigue during World War I, when government ministers in Britain were concerned about the impact of fatigue on workers in munitions factories but not other types of factories.Kreis, S. (1995). Early experiments in British scientific management: the Health of Munitions Workers' Committee, 1915-1920. ''Journal of Management History (archive), 1'', 65-78. doi.org/10.1108/13552529510088330 In the U. K. some interest in worker well-being emerged with the efforts of Charles Samuel Myers and his National Institute of Industrial Psychology (NIIP) during the inter-War years. In the U. S. during the mid-twentieth century industrial psychologist Arthur Kornhauser pioneered the study of occupational mental health, linking industrial working conditions to mental health as well as the spillover of an unsatisfying job into a worker's personal life.Zickar, M. J. (2003). Remembering Arthur Kornhauser: Industrial psychology's advocate for worker well-being. ''Journal of Applied Psychology, 88'', 363–369. Zickar accumulated evidence to show that "no other industrial psychologist of his era was as devoted to advocating management and labor practices that would improve the lives of working people."


Occupational health psychology

As interest in the worker health expanded toward the end of the twentieth century, the field of occupational health psychology (OHP) emerged. OHP is a branch of psychology that is interdisciplinary.Spector, P. E. (2021). From occupational fatigue to occupational health. In L. M. Lapierre & C. Cooper (Eds.). ''Cambridge companion to organizational stress and well-being''. New York: Cambridge University Press.Centers for Disease Control and Prevention. ''Occupational Health Psychology (OHP)''

OHP is concerned with the health and safety of workers. OHP addresses topic areas such as the impact of occupational stressors on physical and mental health, mistreatment of workers (e.g., bullying and violence), work-family balance, the impact of involuntary unemployment on physical and mental health, the influence of psychosocial factors on safety and accidents, and interventions designed to improve/protect worker health. OHP grew out of health psychology, industrial and organizational psychology, and occupational medicine.Everly, G.S., Jr. (1986). An introduction to occupational health psychology. In P.A. Keller & L.G. Ritt (Eds.), ''Innovations in clinical practice: A source book'' (Vol. 5, pp. 331–338). Sarasota, FL: Professional Resource Exchange. OHP has also been informed by disciplines outside psychology, including industrial engineering, sociology, and economics.


Research methods

Quantitative psychological research lends itself to the statistical testing of hypotheses. Although the field makes abundant use of randomized and controlled experiments in laboratory settings, such research can only assess a limited range of short-term phenomena. Some psychologists rely on less rigorously controlled, but more Ecological validity, ecologically valid, field experiments as well. Other research psychologists rely on statistical methods to glean knowledge from population data. The statistical methods research psychologists employ include the Pearson product–moment correlation coefficient, the analysis of variance, multiple linear regression, logistic regression,
structural equation modeling Structural equation modeling (SEM) is a label for a diverse set of methods used by scientists in both experimental and observational research across the sciences, business, and other fields. It is used most in the social and behavioral scienc ...
, and hierarchical linear modeling. The Psychometrics, measurement and operational definition, operationalization of important Construct (psychology), constructs is an essential part of these research designs. Although this type of psychological research is much less abundant than quantitative research, some psychologists conduct qualitative research. This type of research can involve interviews, questionnaires, and first-hand observation. While hypothesis testing is rare, virtually impossible, in qualitative research, qualitative studies can be helpful in theory and hypothesis generation, interpreting seemingly contradictory quantitative findings, and understanding why some interventions fail and others succeed.


Controlled experiments

A true experiment with randomized controlled trial, random assignment of research participants (sometimes called subjects) to rival conditions allows researchers to make strong inferences about causal relationships. When there are large numbers of research participants, the random assignment (also called random allocation) of those participants to rival conditions ensures that the individuals in those conditions will, on average, be similar on most characteristics, including characteristics that went unmeasured. In an experiment, the researcher alters one or more variables of influence, called independent variables, and measures resulting changes in the factors of interest, called dependent variables. Prototypical experimental research is conducted in a laboratory with a carefully controlled environment. A Quasi-experimental design, quasi-experiment refers to a situation in which there are rival conditions under study but random assignment to the different conditions is not possible. Investigators must work with preexisting groups of people. Researchers can use common sense to consider how much the nonrandom assignment threatens the study's Validity (logic), validity. For example, in research on the best way to affect reading achievement in the first three grades of school, school administrators may not permit educational psychologists to randomly assign children to phonics and whole language classrooms, in which case the psychologists must work with preexisting classroom assignments. Psychologists will compare the achievement of children attending phonics and whole language classes and, perhaps, statistically adjust for any initial differences in reading level. Experimental researchers typically use a statistical hypothesis testing model which involves making predictions before conducting the experiment, then assessing how well the data collected are consistent with the predictions. These predictions are likely to originate from one or more abstract scientific hypotheses about how the phenomenon under study actually works.


Other types of studies

Survey methodology, Surveys are used in psychology for the purpose of measuring Attitude (psychology), attitudes and trait theory, traits, monitoring changes in mood (psychology), mood, and checking the validity of experimental manipulations (checking research participants' perception of the condition they were assigned to). Psychologists have commonly used paper-and-pencil surveys. However, surveys are also conducted over the phone or through e-mail. Web-based surveys are increasingly used to conveniently reach many subjects. Observational studies are commonly conducted in psychology. In Cross-sectional studies, cross-sectional observational studies, psychologists collect data at a single point in time. The goal of many cross-sectional studies is the assess the extent factors are correlated with each other. By contrast, in longitudinal studies psychologists collect data on the same sample at two or more points in time. Sometimes the purpose of longitudinal research is to study trends across time such as the stability of traits or age-related changes in behavior. Because some studies involve endpoints that psychologists cannot ethically study from an experimental standpoint, such as identifying the causes of depression, they conduct longitudinal studies a large group of depression-free people, periodically assessing what is happening in the individuals' lives. In this way psychologists have an opportunity to test causal hypotheses regarding conditions that commonly arise in people's lives that put them at risk for depression. Problems that affect longitudinal studies include Selection bias#Attrition, selective attrition, the type of problem in which bias is introduced when a certain type of research participant disproportionately leaves a study. Exploratory data analysis refers to a variety of practices that researchers use to reduce a great many variables to a small number overarching factors. In Charles Sanders Peirce#Modes of inference, Peirce's three modes of inference, exploratory data analysis corresponds to abduction (logic), abduction. Meta-analysis is the technique research psychologists use to integrate results from many studies of the same variables and arriving at a grand average of the findings.


Direct brain observation/manipulation

A classic and popular tool used to relate mental and neural activity is the electroencephalogram (EEG), a technique using amplified electrodes on a person's scalp to measure voltage changes in different parts of the brain. Hans Berger, the first researcher to use EEG on an unopened skull, quickly found that brains exhibit signature "brain waves": electric oscillations which correspond to different states of consciousness. Researchers subsequently refined statistical methods for synthesizing the electrode data, and identified unique brain wave patterns such as the delta wave observed during non-REM sleep. Newer functional neuroimaging techniques include functional magnetic resonance imaging and positron emission tomography, both of which track the flow of blood through the brain. These technologies provide more localized information about activity in the brain and create representations of the brain with widespread appeal. They also provide insight which avoids the classic problems of subjective self-reporting. It remains challenging to draw hard conclusions about where in the brain specific thoughts originate—or even how usefully such localization corresponds with reality. However, neuroimaging has delivered unmistakable results showing the existence of correlations between mind and brain. Some of these draw on a systemic neural network model rather than a localized function model. Interventions such as transcranial magnetic stimulation and drugs also provide information about brain–mind interactions. Psychopharmacology is the study of drug-induced mental effects.


Computer simulation

Computational modeling is a tool used in mathematical psychology and cognitive psychology to simulate behavior. This method has several advantages. Since modern computers process information quickly, simulations can be run in a short time, allowing for high statistical power. Modeling also allows psychologists to visualize hypotheses about the functional organization of mental events that couldn't be directly observed in a human. Computational neuroscience uses mathematical models to simulate the brain. Another method is symbolic modeling, which represents many mental objects using variables and rules. Other types of modeling include dynamic systems and stochastic process, stochastic modeling.


Animal studies

Animal experiments aid in investigating many aspects of human psychology, including perception, emotion, learning, memory, and thought, to name a few. In the 1890s, Russian physiologist Ivan Pavlov famously used dogs to demonstrate classical conditioning. Non-human primates, cats, dogs, pigeons, and rats and other rodents are often used in psychological experiments. Ideally, controlled experiments introduce only one independent variable at a time, in order to ascertain its unique effects upon dependent variables. These conditions are approximated best in laboratory settings. In contrast, human environments and genetic backgrounds vary so widely, and depend upon so many factors, that it is difficult to control important variable (research), variables for human subjects. There are pitfalls, however, in generalizing findings from animal studies to humans through animal models. Comparative psychology refers to the scientific study of the behavior and mental processes of non-human animals, especially as these relate to the phylogenetic history, adaptive significance, and development of behavior. Research in this area explores the behavior of many species, from insects to primates. It is closely related to other disciplines that study animal behavior such as ethology. Research in comparative psychology sometimes appears to shed light on human behavior, but some attempts to connect the two have been quite controversial, for example the Sociobiology of E.O. Wilson. Animal models are often used to study neural processes related to human behavior, e.g. in cognitive neuroscience.


Qualitative research

Qualitative research is often designed to answer questions about the thoughts, feelings, and behaviors of individuals. Qualitative research involving first-hand observation can help describe events as they occur, with the goal of capturing the richness of everyday behavior and with the hope of discovering and understanding phenomena that might have been missed if only more cursory examinations are made. Qualitative psychological research methods include interviews, first-hand observation, and participant observation. Creswell (2003) identified five main possibilities for qualitative research, including narrative, phenomenology, ethnography, case study, and grounded theory. Qualitative researchers sometimes aim to enrich our understanding of symbols, subjective experiences, or social structures. Sometimes hermeneutic and critical aims can give rise to quantitative research, as in
Erich Fromm Erich Seligmann Fromm (; ; March 23, 1900 – March 18, 1980) was a German social psychologist, psychoanalyst, sociologist, humanistic philosopher A philosopher is a person who practices or investigates philosophy Philosophy ...
's application of psychological and sociological theories, in his book ''Escape from Freedom'', to understanding why many ordinary Germans supported Hitler. Just as Jane Goodall studied chimpanzee social and family life by careful observation of chimpanzee behavior in the field, psychologists conduct naturalistic observation of ongoing human social, professional, and family life. Sometimes the participants are aware they are being observed, and other times the participants do not know they are being observed. Strict ethical guidelines must be followed when covert observation is being carried out.


Program evaluation

Program evaluation involves the systematic collection, analysis, and application of information to answer questions about projects, policies and programs, particularly about their effectiveness. In both the public and private sectors, stakeholders often want to know the extent which the programs they are funding, implementing, voting for, receiving, or objecting to are producing the intended effects. While program evaluation first focuses on effectiveness, important considerations often include how much the program costs per participant, how the program could be improved, whether the program is worthwhile, whether there are better alternatives, if there are unintended outcomes, and whether the program goals are appropriate and useful.


Contemporary issues in methodology and practice


Metascience

Metascience involves the application of scientific methodology to study science itself. The field of metascience has revealed problems in psychological research. Some psychological research has suffered from bias, problematic reproducibility, and misuse of statistics. These findings have led to calls for reform from within and from outside the scientific community.


Confirmation bias

In 1959, statistician Theodore Sterling examined the results of psychological studies and discovered that 97% of them supported their initial hypotheses, implying possible publication bias. Similarly, Fanelli (2010) found that 91.5% of psychiatry/psychology studies confirmed the effects they were looking for, and concluded that the odds of this happening (a positive result) was around five times higher than in fields such as space science or geosciences. Fanelli argued that this is because researchers in "softer" sciences have fewer constraints to their conscious and unconscious biases.


Replication

A replication crisis in psychology has emerged. Many notable findings in the field have not been replicated. Some researchers were even accused of publishing fraudulent results. Systematic efforts, including efforts by the Reproducibility Project of the Center for Open Science, to assess the extent of the problem found that as many as two-thirds of highly publicized findings in psychology failed to be replicated. Reproducibility has generally been stronger in cognitive psychology (in studies and journals) than social psychology and subfields of differential psychology. Other subfields of psychology have also been implicated in the replication crisis, including clinical psychology, developmental psychology, and a field closely related to psychology, educational research. Focus on the replication crisis has led to other renewed efforts in the discipline to re-test important findings. In response to concerns about publication bias and data dredging (conducting a large number of statistical tests on a great many variables but restricting reporting to the results that were statistically significant), 295 psychology and medical journals have adopted Scholarly peer review#Result-blind peer review, result-blind peer review where studies are accepted not on the basis of their findings and after the studies are completed, but before the studies are conducted and upon the basis of the methodological rigor of their experimental designs and the theoretical justifications for their proposed statistical analysis before data collection or analysis is conducted. In addition, large-scale collaborations among researchers working in multiple labs in different countries have taken place. The collaborators regularly make their data openly available for different researchers to assess. Allen and Mehler estimated that 61 percent of result-blind studies have yielded null results, in contrast to an estimated 5 to 20 percent in traditional research.


Misuse of statistics

Some critics view statistical hypothesis testing#Criticism, statistical hypothesis testing as misplaced. Psychologist and statistician Jacob Cohen (statistician), Jacob Cohen wrote in 1994 that psychologists routinely confuse statistical significance with practical importance, enthusiastically reporting great certainty in unimportant facts. Some psychologists have responded with an increased use of effect size statistics, rather than sole reliance on ''p''-values.


WEIRD bias

In 2008, Arnett pointed out that most articles in American Psychological Association journals were about U.S. populations when U.S. citizens are only 5% of the world's population. He complained that psychologists had no basis for assuming psychological processes to be universal and generalizing research findings to the rest of the global population. In 2010, Henrich, Heine, and Norenzayan reported a bias in conducting psychology studies with participants from "''WEIRD''" ("Western, Educated, Industrialized, Rich, and Democratic") societies. Henrich et al. found that "96% of psychological samples come from countries with only 12% of the world’s population" (p. 63). The article gave examples of results that differ significantly between people from WEIRD and tribal cultures, including the Müller-Lyer illusion. Arnett (2008), Elizabeth Altmaier, Altmaier and Hall (2008) and Morgan-Consoli et al. (2018) view the Western bias in research and theory as a serious problem considering psychologists are increasingly applying psychological principles developed in WEIRD regions in their research, clinical work, and consultation with populations around the world. In 2018, Rad, Martingano, and Ginges showed that nearly a decade after Henrich et al.'s paper, over 80% of the samples used in studies published in the journal Psychological Science employed WEIRD samples. Moreover, their analysis showed that several studies did not fully disclose the origin of their samples; the authors offered a set of recommendations to editors and reviewers to reduce WEIRD bias.


Unscientific mental health training

Some observers perceive a gap between scientific theory and its application—in particular, the application of unsupported or unsound clinical practices. Critics say there has been an increase in the number of mental health training programs that do not instill scientific competence. Practices such as "facilitated communication for infantile autism"; memory-recovery techniques including Bodywork (alternative medicine), body work; and other therapies, such as Rebirthing (breathwork), rebirthing and reparenting, may be dubious or even dangerous, despite their popularity. These practices, however, are outside the mainstream practices taught in clinical psychology doctoral programs.


Ethics

Ethical standards in the discipline have changed over time. Some famous past studies are today considered unethical and in violation of Guidelines for human subject research#APA Ethics Code, established codes (the Canadian Code of Conduct for Research Involving Humans, and the Belmont Report). The American Psychological Association has advanced a set of ethical principles and a code of conduct for the profession. The most important contemporary standards include informed and voluntary consent. After World War II, the Nuremberg Code was established because of Nazi abuses of experimental subjects. Later, most countries (and scientific journals) adopted the Declaration of Helsinki. In the U.S., the National Institutes of Health established the Institutional Review Board in 1966, and in 1974 adopted the National Research Act (HR 7724). All of these measures encouraged researchers to obtain informed consent from human participants in experimental studies. A number of influential but ethically dubious studies led to the establishment of this rule; such studies included the Walter E. Fernald Developmental Center#Nuclear medicine research in children, MIT-Harvard Fernald School radioisotope studies, the Thalidomide scandal, Thalidomide tragedy, the Hepatitis#Willowbrook State School experiments, Willowbrook hepatitis study, and Milgram experiment, Stanley Milgram's studies of obedience to authority.


Humans

Universities have ethics committees dedicated to protecting the rights (e.g., voluntary nature of participation in the research, privacy) and well-being (e.g., minimizing distress) of research participants. University ethics committees evaluate proposed research to ensure that researchers protect the rights and well-being of participants; an investigator's research project cannot be conducted unless approved by such an ethics committee. The ethics code of the American Psychological Association originated in 1951 as "Ethical Standards of Psychologists". This code has guided the formation of licensing laws in most American states. It has changed multiple times over the decades since its adoption. In 1989, the APA revised its policies on advertising and referral fees to negotiate the end of an investigation by the Federal Trade Commission. The 1992 incarnation was the first to distinguish between "aspirational" ethical standards and "enforceable" ones. Members of the public have a five-year window to file ethics complaints about APA members with the APA ethics committee; members of the APA have a three-year window.Stanley E. Jones, "Ethical Issues in Clinical Psychology", in Weiner (ed.), ''Handbook of Psychology'' (2003), Volume 8: ''Clinical Psychology''. Some of the ethical issues considered most important are the requirement to practice only within the area of competence, to maintain confidentiality with the patients, and to avoid sexual relations with them. Another important principle is informed consent, the idea that a patient or research subject must understand and freely choose a procedure they are undergoing. Some of the most common complaints against clinical psychologists include sexual misconduct.


Other animals

Research on other animals is also governed by university ethics committees. Research on nonhuman animals cannot proceed without permission of the ethics committee of the researcher's home institution. Current ethical guidelines state that using non-human animals for scientific purposes is only acceptable when the harm (physical or psychological) done to animals is outweighed by the benefits of the research. Keeping this in mind, psychologists can use certain research techniques on animals that could not be used on humans. * Comparative psychologist Harry Harlow drew moral condemnation for pit of despair, isolation experiments on rhesus macaque monkeys at the University of Wisconsin–Madison in the 1970s. The aim of the research was to produce an animal model of clinical depression. Harlow also devised what he called a "rape rack", to which the female isolates were tied in normal monkey mating posture. In 1974, American literary critic Wayne C. Booth wrote that, "Harry Harlow and his colleagues go on torturing their nonhuman primates decade after decade, invariably proving what we all knew in advance—that social creatures can be destroyed by destroying their social ties." He writes that Harlow made no mention of the criticism of the morality of his work.Booth, Wayne C. ''Modern Dogma and the Rhetoric of Assent'', Volume 5, of University of Notre Dame, Ward-Phillips lectures in English language and literature, University of Chicago Press, 1974, p. 114. Booth is explicitly discussing this experiment. His next sentence is, "His most recent outrage consists of placing monkeys in 'solitary' for twenty days—what he calls a 'vertical chamber apparatus .... designed on an intuitive basis' to produce 'a state of helplessness and hopelessness, sunken in a well of despair.


References


Sources

* Baker, David B. (ed.). ''The Oxford Handbook of the History of Psychology''. Oxford University Press (''Oxford Library of Psychology''), 2012. * Brock, Adrian C. (ed.). ''Internationalizing the History of Psychology''. New York University Press, 2006. * Cina, Carol. "Social Science for Whom? A Structural History of Social Psychology." Doctoral dissertation, accepted by the State University of New York at Stony Brook, 1981. * Cocks, Geoffrey. ''Psychotherapy in the Third Reich: The Göring Institute'', second edition. New Brunswick, NJ: Transaction Publishers, 1997. * Forgas, Joseph P., Kipling D. Williams, & Simon M. Laham. ''Social Motivation: Conscious and Unconscious Processes''. Cambridge University Press, 2005. * Guthrie, Robert. ''Even the Rat was White: A Historical View of Psychology''. Second edition. Boston, Allyn and Bacon (Viacon), 1998. * Herman, Ellen. "Psychology as Politics: How Psychological Experts Transformed Public Life in the United States 1940–1970." Doctoral dissertation accepted by Brandeis University, 1993. * Hock, Roger R. ''Forty Studies That Changed Psychology: Explorations Into the History of Psychological Research''. Fourth edition. Upper Saddle River, NJ: Prentice Hall, 2002. * Morgan, Robert D., Tara L. Kuther, & Corey J. Habben. ''Life After Graduate School in Psychology: Insider's Advice from New Psychologists''. New York: Psychology Press (Taylor & Francis Group), 2005. * Severin, Frank T. (ed.). ''Humanistic Viewpoints in Psychology'': A Book of Readings. New York: McGraw Hill, 1965. ISBN * Shah, James Y., and Wendi L. Gardner. ''Handbook of Motivation Science''. New York: The Guilford Press, 2008. * Wallace, Edwin R., IV, & John Gach (eds.), ''History of Psychiatry and Medical Psychology''; New York: Springer, 2008; * Bernard Weiner, Weiner, Bernard. ''Human Motivation''. Hoboken, NJ: Taylor and Francis, 2013. * Irving B. Weiner, Weiner, Irving B. ''Handbook of Psychology''. Hoboken, NJ: John Wiley & Sons, 2003. ** Volume 1: ''History of Psychology''. Donald K. Freedheim, ed. ** Volume 2: ''Research Methods in Psychology''. John A. Schinka & Wayne F. Velicer, eds. ** Volume 3: ''Biological Psychology''. Michela Gallagher & Randy J. Nelson, eds. ** Volume 4: ''Experimental Psychology''. Alice F. Healy & Robert W. Proctor, eds. ** Volume 8: ''Clinical Psychology''. George Stricker, Thomas A. Widiger, eds.


Further reading

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External links

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American Psychological Association

Association for Psychological Science
{{Authority control Psychology, Behavioural sciences Cognitive behavioral therapy