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Variability Hypothesis
The variability hypothesis, also known as the greater male variability hypothesis, is the hypothesis that males generally display greater variability in traits than females do. It has often been discussed in relation to human cognitive ability, where some studies appear to show that males are more likely than females to have either very high or very low IQ test scores. In this context, there is controversy over whether such sex-based differences in the variability of intelligence exist, and if so, whether they are caused by genetic differences, environmental conditioning, or a mixture of both. Sex-differences in variability have been observed in many abilities and traits –– including physical, psychological and genetic ones –– across a wide range of sexually dimorphic species. History The notion of greater male variability — at least in respect to physical characteristics — can be traced back to the writings of Charles Darwin. When he expounded his theory of sexual s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brain Morphometry
Brain morphometry is a subfield of both morphometry and the brain sciences, concerned with the measurement of brain structures and changes thereof during development, aging, learning, disease and evolution. Since autopsy-like dissection is generally impossible on living brains, brain morphometry starts with noninvasive neuroimaging data, typically obtained from magnetic resonance imaging (MRI). These data are born digital, which allows researchers to analyze the brain images further by using advanced mathematical and statistical methods such as shape quantification or multivariate analysis. This allows researchers to quantify anatomical features of the brain in terms of shape, mass, volume (e.g. of the hippocampus, or of the primary versus secondary visual cortex), and to derive more specific information, such as the encephalization quotient, grey matter density and white matter connectivity, gyrification, cortical thickness, or the amount of cerebrospinal fluid. These variables can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Psychology
Psychology is defined as "the scientific study of behavior and mental processes". Philosophical interest in the human mind and behavior dates back to the ancient civilizations of Egypt, Persia, Greece, China, and India. Psychology as a field of experimental study began in 1854 in Leipzig, Germany when Gustav Fechner created the first theory of how judgments about sensory experiences are made and how to experiment on them. Fechner's theory, recognized today as Signal Detection Theory foreshadowed the development of statistical theories of comparative judgment and thousands of experiments based on his ideas (Link, S. W. Psychological Science, 1995). Later, 1879, Wilhelm Wundt founded in Leipzig, Germany, the first Psychological laboratory dedicated exclusively to psychological research. Wundt was also the first person to refer to himself as ''a psychologist.'' A notable precursor of Wundt was Ferdinand Ueberwasser (1752-1812) who designated himself ''Professor of Empirical Psycholo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Psychological Theories
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 immense scope, crossing the boundaries between the Natural science, natural and social sciences. Psychologists seek an understanding of the Emergence, emergent properties of brains, linking the discipline to neuroscience. 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. Psi (Greek), Ψ (''psi''), the first Greek alphabet, letter 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lek Paradox
The lek paradox is the conundrum of how additive or beneficial genetic variation is maintained in lek mating species, in the face of consistent female preferences, sexual selection. While many studies have attempted to explain how the lek paradox fits into Darwinian theory, the paradox remains. Persistent female choice for particular male trait values should erode genetic diversity in male traits and thereby remove the benefits of choice, yet choice persists. This paradox can be somewhat alleviated by the occurrence of mutations introducing potential differences, as well as the possibility that traits of interest have more or less favorable recessive alleles. The basis of the lek paradox is continuous genetic variation in spite of strong female preference for certain traits. There are two conditions in which the lek paradox arises. The first is that males contribute only genes and the second is that female preference does not affect fecundity. Female choice should lead to dir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bateman's Principle
Bateman's principle, in evolutionary biology, is that in most species, variability in reproductive success (or reproductive variance) is greater in males than in females. It was first proposed by Angus John Bateman (1919–1996), an English geneticist. Bateman suggested that, since males are capable of producing millions of sperm cells with little effort, while females invest much higher levels of energy in order to nurture a relatively small number of eggs, the female plays a significantly larger role in their offspring's reproductive success. Bateman's paradigm thus views females as the limiting factor of parental investment, over which males will compete in order to copulate successfully. Although Bateman's principle served as a cornerstone for the study of sexual selection for many decades, it has recently been subject to criticism. Attempts to reproduce Bateman's experiments in 2012 and 2013 were unable to support his conclusions. Some scientists have criticized Bateman's exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex And Psychology
Sex differences in psychology are differences in the mental functions and behaviors of the sexes and are due to a complex interplay of biological, developmental, and cultural factors. Differences have been found in a variety of fields such as mental health, cognitive abilities, personality, emotion, sexuality, and tendency towards aggression. Such variation may be innate, learned, or both. Modern research attempts to distinguish between these causes and to analyze any ethical concerns raised. Since behavior is a result of interactions between nature and nurture, researchers are interested in investigating how biology and environment interact to produce such differences, although this is often not possible. A number of factors combine to influence the development of sex differences, including genetics and epigenetics; differences in brain structure and function; hormones, and socialization. The formation of gender is controversial in many scientific fields, including psycholo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex Differences In Humans
Sex differences in humans have been studied in a variety of fields. Sex determination occurs by the presence or absence of a Y in the 23rd pair of chromosomes in the human genome. Phenotypic sex refers to an individual's sex as determined by their internal and external genitalia and expression of secondary sex characteristics. Sex differences generally refer to traits that are sexually dimorphic. A subset of such differences is hypothesized to be the product of the evolutionary process of sexual selection.Mealey, L. (2000). ''Sex differences''. NY: Academic Press. Medicine Sex differences in medicine include sex-specific diseases, which are diseases that occur ''only'' in people of one sex; and sex-related diseases, which are diseases that are more usual to one sex, or which manifest differently in each sex. For example, certain autoimmune diseases may occur predominantly in one sex, for unknown reasons. 90% of primary biliary cirrhosis cases are women, whereas primary scleros ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Google's Ideological Echo Chamber
"Google's Ideological Echo Chamber", commonly referred to as the Google memo, is an internal memo, dated July 2017, by US-based Google engineer James Damore () about Google's culture and diversity policies. The memo and Google's subsequent dismissal of Damore in August 2017 became a subject of interest for the media. Damore's arguments received both praise and criticism from media outlets, scientists, academics and others. The company fired Damore for violation of the company's code of conduct. Damore filed a complaint with the National Labor Relations Board, but later withdrew this complaint. A lawyer with the NLRB wrote that his firing was proper. After withdrawing this complaint, Damore filed a class action lawsuit, retaining the services of attorney Harmeet Dhillon, alleging that Google was discriminating against conservatives, whites, Asians, and men. Damore withdrew his claims in the lawsuit to pursue arbitration against Google. Course of events James Damore was spurr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Google
Google LLC () is an American multinational technology company focusing on search engine technology, online advertising, cloud computing, computer software, quantum computing, e-commerce, artificial intelligence, and consumer electronics. It has been referred to as "the most powerful company in the world" and one of the world's most valuable brands due to its market dominance, data collection, and technological advantages in the area of artificial intelligence. Its parent company Alphabet is considered one of the Big Five American information technology companies, alongside Amazon, Apple, Meta, and Microsoft. Google was founded on September 4, 1998, by Larry Page and Sergey Brin while they were PhD students at Stanford University in California. Together they own about 14% of its publicly listed shares and control 56% of its stockholder voting power through super-voting stock. The company went public via an initial public offering (IPO) in 2004. In 2015, Google was reor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harvard Faculty Of Arts And Sciences
The Harvard Faculty of Arts and Sciences (FAS) is the largest of the ten faculties that constitute Harvard University. Headquartered principally in Cambridge, Massachusetts, and centered in the historic Harvard Yard, FAS is the only faculty responsible for both undergraduate and graduate education. FAS administers the courses offered at Harvard College, the Harvard Graduate School of Arts and Sciences, The John A. Paulson School of Engineering and Applied Sciences (SEAS), and the Harvard Division of Continuing Education. It is headed by Dean Claudine Gay. As of Fall 2019, FAS comprised 1221 total faculty, including 719 tenured and tenure-track professors as well as 502 other professors, lecturers, preceptors, and visiting faculty in some 30 academic departments in the arts and humanities, the social sciences, the natural sciences, and the engineering and applied sciences. There are approximately 6,800 undergraduates (Harvard College) and 4,500 graduate students ( Harvard Graduat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larry Summers
Lawrence Henry Summers (born November 30, 1954) is an American economist who served as the 71st United States secretary of the treasury from 1999 to 2001 and as director of the National Economic Council from 2009 to 2010. He also served as president of Harvard University from 2001 to 2006,"Historical Facts" Harvard University, retrieved March 31, 2017 where he is the Charles W. Eliot university professor and director of the Mossavar-Rahmani Center for Business and Government at . [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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