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Psychological egoism is the view that humans are always motivated by self-interest and selfishness, even in what seem to be acts of
altruism Altruism is the principle and moral practice of concern for the welfare and/or happiness of other human beings or animals, resulting in a quality of life both material and spiritual. It is a traditional virtue in many cultures and a core as ...
. It claims that, when people choose to help others, they do so ultimately because of the personal benefits that they themselves expect to obtain, directly or indirectly, from so doing. This is a
descriptive In the study of language, description or descriptive linguistics is the work of objectively analyzing and describing how language is actually used (or how it was used in the past) by a speech community. François & Ponsonnet (2013). All acad ...
rather than
normative Normative generally means relating to an evaluative standard. Normativity is the phenomenon in human societies of designating some actions or outcomes as good, desirable, or permissible, and others as bad, undesirable, or impermissible. A norm in ...
view, since it only makes claims about how things are, not how they “ought to be” according to some. It is, however, related to several other normative forms of egoism, such as
ethical egoism In ethical philosophy, ethical egoism is the normative position that moral agents ''ought'' to act in their own self-interest. It differs from psychological egoism, which claims that people ''can only'' act in their self-interest. Ethical egoism ...
and
rational egoism Rational egoism (also called rational selfishness) is the principle that an action is rational if and only if it maximizes one's self-interest.Baier (1990), p. 201; Gert (1998), p. 69; Shaver (2002), §3; Moseley (2006), §2. As such, it is consi ...
.


Subtypes of psychological egoism


Psychological hedonism

A specific form of psychological egoism is psychological hedonism, the view that the ultimate motive for all voluntary human action is the desire to experience
pleasure Pleasure refers to experience that feels good, that involves the enjoyment of something. It contrasts with pain or suffering, which are forms of feeling bad. It is closely related to value, desire and action: humans and other conscious anima ...
or to avoid
pain Pain is a distressing feeling often caused by intense or damaging stimuli. The International Association for the Study of Pain defines pain as "an unpleasant sensory and emotional experience associated with, or resembling that associated with, ...
. Immediate gratification can be sacrificed for a chance of greater, future pleasure. Further, humans are not motivated to strictly avoid pain and only pursue pleasure, but, instead, humans will endure pain to achieve the greatest net pleasure. Accordingly, all actions are tools for increasing pleasure or decreasing pain, even those defined as altruistic and those that do not cause an immediate change in satisfaction levels. The most famous psychological egoists are
Sextus Empiricus Sextus Empiricus ( grc-gre, Σέξτος Ἐμπειρικός, ; ) was a Ancient Greece, Greek Pyrrhonism, Pyrrhonist philosopher and Empiric school physician. His philosophical works are the most complete surviving account of ancient Greek and ...
,
Pierre Bayle Pierre Bayle (; 18 November 1647 – 28 December 1706) was a French philosopher, author, and lexicographer. A Huguenot, Bayle fled to the Dutch Republic in 1681 because of religious persecution in France. He is best known for his '' Historica ...
, and
Bernard Mandeville Bernard Mandeville, or Bernard de Mandeville (; 15 November 1670 – 21 January 1733), was an Anglo-Dutch philosopher, political economist and satirist. Born in Rotterdam, Netherlands, he lived most of his life in England and used English for ...
.


Final cause

Some theorists explain behavior motivated by self-interest without using pleasure and pain as the
final cause The four causes or four explanations are, in Aristotelian thought, four fundamental types of answer to the question "why?", in analysis of change or movement in nature: the material, the formal, the efficient, and the final. Aristotle wrote th ...
s of behavior.


Foundations

Beginning with ancient philosophy,
Epicureanism Epicureanism is a system of philosophy founded around 307 BC based upon the teachings of the ancient Greek philosopher Epicurus. Epicureanism was originally a challenge to Platonism. Later its main opponent became Stoicism. Few writings by Epi ...
claims humans live to maximize pleasure.
Epicurus Epicurus (; grc-gre, Ἐπίκουρος ; 341–270 BC) was an ancient Greek philosopher and sage who founded Epicureanism, a highly influential school of philosophy. He was born on the Greek island of Samos to Athenian parents. Influenced ...
argued the theory of human behavior being motivated by pleasure alone is evidenced from infancy to adulthood. Humanity performs altruistic, honorable, and virtuous acts not for the sake of another or because of a moral code but rather to increase the well-being of the self. In modern philosophy,
Jeremy Bentham Jeremy Bentham (; 15 February 1748 Old_Style_and_New_Style_dates">O.S._4_February_1747.html" ;"title="Old_Style_and_New_Style_dates.html" ;"title="nowiki/>Old Style and New Style dates">O.S. 4 February 1747">Old_Style_and_New_Style_dates.htm ...
asserted, like Epicurus, that human behavior is governed by a need to increase pleasure and decrease pain. Bentham explicitly described what types and qualities of pain and pleasure exist, and how human motives are singularly explained using psychological hedonism. Bentham attempted to quantify psychological hedonism. Bentham endeavored to find the ideal human behavior based on
hedonic calculus The felicific calculus is an algorithm formulated by utilitarian philosopher Jeremy Bentham (1747–1832) for calculating the degree or amount of pleasure that a specific action is likely to induce. Bentham, an ethical hedonist, believed the mor ...
or the measurement of relative gains and losses in pain and pleasure to determine the most pleasurable action a human could choose in a situation. From an evolutionary perspective,
Herbert Spencer Herbert Spencer (27 April 1820 – 8 December 1903) was an English philosopher, psychologist, biologist, anthropologist, and sociologist famous for his hypothesis of social Darwinism. Spencer originated the expression "survival of the fittest" ...
, a psychological egoist, argued that all animals primarily seek to survive and protect their lineage. Essentially, the need for the individual and for the individual's immediate family to live supersedes the others' need to live. All species attempt to maximize their own chances of survival and, therefore, well-being. Spencer asserted the best adapted creatures will have their pleasure levels outweigh their pain levels in their environments. Thus, pleasure meant an animal was fulfilling its egoist goal of self survival, and pleasure would always be pursued because species constantly strive for survival.


Contributions to modern psychology


Psychoanalysis

Whether or not Sigmund Freud was a psychological egoist, his concept of the pleasure principle borrowed much from psychological egoism and psychological hedonism in particular. The pleasure principle rules the behavior of the Id which is an unconscious force driving humans to release tension from unfulfilled desires. When Freud introduced
Thanatos In Greek mythology, Thanatos (; grc, Θάνατος, pronounced in "Death", from θνῄσκω ''thnēskō'' "(I) die, am dying") was the personification of death. He was a minor figure in Greek mythology, often referred to but rarely appe ...
and its opposing force,
Eros In Greek mythology, Eros (, ; grc, Ἔρως, Érōs, Love, Desire) is the Greek god of love and sex. His Roman counterpart was Cupid ("desire").''Larousse Desk Reference Encyclopedia'', The Book People, Haydock, 1995, p. 215. In the earli ...
, the pleasure principle emanating from psychological hedonism became aligned with the Eros, which drives a person to satiate sexual and reproductive desires. Alternatively, Thanatos seeks the cessation of pain through death and the end of the pursuit of pleasure: thus a hedonism rules Thanatos, but it centers on the complete avoidance of pain rather than psychological hedonist function which pursues pleasure and avoids pain. Therefore, Freud believed in qualitatively different hedonisms where the total avoidance of pain hedonism and the achievement of the greatest net pleasure hedonism are separate and associated with distinct functions and drives of the human psyche. Although Eros and Thanatos are ruled by qualitatively different types of hedonism, Eros remains under the rule of Jeremy Bentham's
quantitative Quantitative may refer to: * Quantitative research, scientific investigation of quantitative properties * Quantitative analysis (disambiguation) * Quantitative verse, a metrical system in poetry * Statistics, also known as quantitative analysis ...
psychological hedonism because Eros seeks the greatest net pleasure.


Behaviorism

Traditional
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 (behavioral psychology), antecedent stimuli in the environment, o ...
dictates all human behavior is explained by
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). It also refers to the learni ...
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 ...
. Operant conditioning works through
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 freq ...
and
punishment Punishment, commonly, is the imposition of an undesirable or 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 particular acti ...
which adds or removes pleasure and pain to manipulate behavior. Using pleasure and pain to control behavior means behaviorists assumed the principles of psychological hedonism could be applied to predicting human behavior. For example, Thorndike's law of effect states that behaviors associated with pleasantness will be learned and those associated with pain will be extinguished. Often, behaviorist experiments using humans and animals are built around the assumption that subjects will pursue pleasure and avoid pain. Although psychological hedonism is incorporated into the fundamental principles and experimental designs of behaviorism, behaviorism itself explains and interprets only observable behavior and therefore does not theorize about the ultimate cause of human behavior. Thus, behaviorism uses but does not strictly support psychological hedonism over other understandings of the ultimate drive of human behavior.


Debate

Psychological egoism is controversial. Proponents cite evidence from introspection: reflection on one's own actions may reveal their motives and intended results to be based on self-interest. Psychological egoists and hedonists have found through numerous observations of natural human behavior that behavior can be manipulated through reward and punishment both of which have direct effects of pain and pleasure. Also, the work of some social scientists has
empirical Empirical evidence for a proposition is evidence, i.e. what supports or counters this proposition, that is constituted by or accessible to sense experience or experimental procedure. Empirical evidence is of central importance to the sciences and ...
ly supported this theory. Further, they claim psychological egoism posits a theory that is a more
parsimonious Occam's razor, Ockham's razor, or Ocham's razor ( la, novacula Occami), also known as the principle of parsimony or the law of parsimony ( la, lex parsimoniae), is the problem-solving principle that "entities should not be multiplied beyond neces ...
explanation than competing theories.Sober, E., & Wilson, D. S. (1999) Opponents have argued that psychological egoism is not more parsimonious than other theories. For example, a theory that claims altruism occurs for the sake of altruism explains altruism with less complexity than the egoistic approach. The psychological egoist asserts humans act altruistically for selfish reasons even when cost of the altruistic action is far outweighed by the reward of acting selfishly because altruism is performed to fulfill the desire of a person to act altruistically. Other critics argue that it is false either because it is an over-simplified interpretation of behavior Hume, David (1751). ''An Enquiry Concerning the Principles of Morals''. Public domain. ( link) or that there exists empirical evidence of altruistic behaviour. Recently, some have argued that
evolutionary theory Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation ...
provides evidence against it. Sober, E. & D.S. Wilson (1998). ''Unto Others: The Evolution and Psychology of Unselfish Behavior'', Harvard University Press Critics have stated that proponents of psychological egoism often confuse the satisfaction of their own desires with the satisfaction of their own ''self-regarding'' desires. Even though it is true that every human being seeks his own satisfaction, this sometimes may only be achieved via the well-being of his neighbor. An example of this situation could be phoning for an ambulance when a car accident has happened. In this case, the caller desires the well-being of the victim, even though the desire itself is the caller's own. To counter this critique, psychological egoism asserts that all such desires for the well-being of others are ultimately derived from self-interest. For example, German philosopher
Friedrich Nietzsche Friedrich Wilhelm Nietzsche (; or ; 15 October 1844 – 25 August 1900) was a German philosopher, prose poet, cultural critic, philologist, and composer whose work has exerted a profound influence on contemporary philosophy. He began his ...
was a psychological egoist for some of his career, though he is said to have repudiated that later in his campaign against
morality Morality () is the differentiation of intentions, decisions and actions between those that are distinguished as proper (right) and those that are improper (wrong). Morality can be a body of standards or principles derived from a code of cond ...
. He argues in §133 of '' The Dawn'' that in such cases compassionate impulses arise out of the projection of our identity unto the object of our feeling. He gives some hypothetical examples as illustrations to his thesis: that of a person, feeling horrified after witnessing a personal feud, coughing blood, or that of the impulse felt to save a person who is drowning in the water. In such cases, according to Nietzsche, there comes into play unconscious fears regarding our own safety. The suffering of another person is felt as a threat to our own happiness and sense of safety, because it reveals our own vulnerability to misfortunes, and thus, by relieving it, one could also ameliorate those personal sentiments. Essentially, proponents argue that altruism is rooted in self-interest whereas opponents claim altruism occurs for altruism's sake or is caused by a non-selfish reason.


Problem of apparent altruism

David Hume once wrote, "What interest can a fond mother have in view, who loses her health by assiduous attendance on her sick child, and afterwards languishes and dies of grief, when freed, by its death he child's from the slavery of that attendance?". It seems incorrect to describe such a mother's goal as self-interested. Psychological egoists, however, respond that helping others in such ways is ultimately motivated by some form of self-interest, such as non-sensory satisfaction, the expectation of reciprocation, the desire to gain respect or reputation, or by the expectation of a reward in a putative afterlife. The helpful action is merely instrumental to these ultimately selfish goals. In the ninth century, Mohammed Ibn Al-Jahm Al-Barmaki (محمد بن الجـَهْم البَرمَكي) has been quoted saying: "No one deserves thanks from another about something he has done for him or goodness he has done, he is either willing to get a reward from God, therefore he wanted to serve himself, or he wanted to get a reward from people, therefore, he has done that to get profit for himself, or to be mentioned and praised by people, therefore, to it is also for himself, or due to his mercy and tenderheartedness, so he has simply done that goodness to pacify these feelings and treat himself." This sort of explanation appears to be close to the view of La Rochefoucauld (and perhaps Hobbes). According to psychological hedonism, the ultimate egoistic motive is to gain good feelings of pleasure and avoid bad feelings of pain. Other, less restricted forms of psychological egoism may allow the ultimate goal of a person to include such things as avoiding punishments from oneself or others (such as guilt or shame) and attaining rewards (such as
pride Pride is defined by Merriam-Webster as "reasonable self-esteem" or "confidence and satisfaction in oneself". A healthy amount of pride is good, however, pride sometimes is used interchangeably with "conceit" or "arrogance" (among other words) wh ...
, self-worth, power or reciprocal beneficial action). Some psychologists explain
empathy Empathy is the capacity to understand or feel what another person is experiencing from within their frame of reference, that is, the capacity to place oneself in another's position. Definitions of empathy encompass a broad range of social, co ...
in terms of psychological hedonism. According to the "merge with others hypothesis", empathy increases the more an individual feels like they are one with another person, and decreases as the oneness decreases. Therefore, altruistic actions emanating from empathy and empathy itself are caused by making others' interests our own, and the satisfaction of their desires becomes our own, not just theirs. Both
cognitive Cognition refers to "the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses". It encompasses all aspects of intellectual functions and processes such as: perception, attention, thought, ...
studies and neuropsychological experiments have provided evidence for this theory: as humans increase our oneness with others our empathy increases, and as empathy increases our inclination to act altruistically increases. Neuropsychological studies have linked
mirror neuron A mirror neuron is a neuron that fires both when an animal acts and when the animal observes the same action performed by another. Thus, the neuron "mirrors" the behavior of the other, as though the observer were itself acting. Such neurons hav ...
s to humans experiencing empathy. Mirror neurons are activated both when a human (or animal) performs an action and when they observe another human (or animal) perform the same action. Researchers have found that the more these mirror neurons fire the more human subjects report empathy. From a neurological perspective, scientists argue that when a human empathizes with another, the brain operates as if the human is actually participating in the actions of the other person. Thus, when performing altruistic actions motivated by empathy, humans experience someone else's pleasure of being helped. Therefore, in performing acts of altruism, people act in their own self interests even at a neurological level.


Criticism


Explanatory power

Even accepting the theory of universal positivity, it is difficult to explain, for example, the actions of a soldier who sacrifices his life by jumping on a grenade in order to save his comrades. In this case, there is simply no time to experience positivity toward one's actions, although a psychological egoist may argue that the soldier experiences moral positivity in knowing that he is sacrificing his life to ensure the survival of his comrades, or that he is avoiding negativity associated with the thought of all his comrades dying. Psychological egoists argue that although some actions may not clearly cause physical nor social positivity, nor avoid negativity, one's current contemplation or reactionary mental expectation of these is the main factor of the decision. When a dog is first taught to sit, it is given a biscuit. This is repeated until, finally, the dog sits without requiring a biscuit. Psychological egoists could claim that such actions which do not 'directly' result in positivity, or reward, are not dissimilar from the actions of the dog. In this case, the action (sitting on command) will have become a force of habit, and breaking such a habit would result in mental discomfort. This basic theory of conditioning behaviour, applied to other seemingly ineffective positive actions, can be used to explain moral responses that are instantaneous and instinctive such as the soldier jumping on the grenade.


Circularity

Psychological egoism has been accused of being
circular Circular may refer to: * The shape of a circle * ''Circular'' (album), a 2006 album by Spanish singer Vega * Circular letter (disambiguation) ** Flyer (pamphlet), a form of advertisement * Circular reasoning, a type of logical fallacy * Circula ...
: "If a person willingly performs an act, that means he derives personal enjoyment from it; therefore, people only perform acts that give them personal enjoyment." In particular, seemingly altruistic acts must be performed because people derive enjoyment from them and are therefore, in reality, egoistic. This statement is circular because its conclusion is identical to its hypothesis: it assumes that people only perform acts that give them personal enjoyment, and concludes that people only perform acts that give them personal enjoyment. This objection was tendered by
William Hazlitt William Hazlitt (10 April 177818 September 1830) was an English essayist, drama and literary critic, painter, social commentator, and philosopher. He is now considered one of the greatest critics and essayists in the history of the English lan ...
and
Thomas Macaulay Thomas Babington Macaulay, 1st Baron Macaulay, (; 25 October 1800 – 28 December 1859) was a British historian and Whig politician, who served as the Secretary at War between 1839 and 1841, and as the Paymaster-General between 1846 and 1 ...
in the 19th century, and has been restated many times since. An earlier version of the same objection was made by
Joseph Butler Joseph Butler (18 May O.S. 1692 – 16 June O.S. 1752) was an English Anglican bishop, theologian, apologist, and philosopher, born in Wantage in the English county of Berkshire (now in Oxfordshire). He is known for critiques of Deism, Thom ...
in 1726.
Joel Feinberg Joel Feinberg (October 19, 1926 in Detroit, Michigan – March 29, 2004 in Tucson, Arizona) was an American political and legal philosopher. He is known for his work in the fields of ethics, action theory, philosophy of law, and political phil ...
, in his 1958 paper "Psychological Egoism", embraces a similar critique by drawing attention to the
infinite regress An infinite regress is an infinite series of entities governed by a recursive principle that determines how each entity in the series depends on or is produced by its predecessor. In the epistemic regress, for example, a belief is justified beca ...
of psychological egoism. He expounds it in the following cross-examination: :"All men desire only satisfaction." :"Satisfaction of what?" :"Satisfaction of their desires." :"Their desires for what?" :"Their desires for satisfaction." :"Satisfaction of what?" :"Their desires." :"For what?" :"For satisfaction"—etc., ''
ad infinitum ''Ad infinitum'' is a Latin phrase meaning "to infinity" or "forevermore". Description In context, it usually means "continue forever, without limit" and this can be used to describe a non-terminating process, a non-terminating ''repeating'' pro ...
''.


Evolutionary argument

In their 1998 book, ''Unto Others'', Sober and Wilson detailed an evolutionary argument based on the likelihood for egoism to evolve under the pressures 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 heritable traits characteristic of a population over generations. Charle ...
. Specifically, they focus on the human behavior of parental care. To set up their argument, they propose two potential psychological mechanisms for this. The hedonistic mechanism is based on a parent's ultimate desire for pleasure or the avoidance of pain and a belief that caring for its offspring will be instrumental to that. The altruistic mechanism is based on an altruistic ultimate desire to care for its offspring. Sober and Wilson argue that when evaluating the likelihood of a given trait to evolve, three factors must be considered: availability, reliability and energetic efficiency. The genes for a given trait must first be ''available'' in the gene pool for selection. The trait must then ''reliably'' produce an increase in fitness for the organism. The trait must also operate with ''energetic efficiency'' to not limit the fitness of the organism. Sober and Wilson argue that there is neither reason to suppose that an altruistic mechanism should be any less available than a hedonistic one nor reason to suppose that the content of thoughts and desires (hedonistic vs. altruistic) should impact energetic efficiency. As availability and energetic efficiency are taken to be equivalent for both mechanisms it follows that the more reliable mechanism will then be the more likely mechanism. For the hedonistic mechanism to produce the behavior of caring for offspring, the parent must believe that the caring behavior will produce pleasure or avoidance of pain for the parent. Sober and Wilson argue that the belief also must be true and constantly reinforced, or it would not be likely enough to persist. If the belief fails then the behavior is not produced. The altruistic mechanism does not rely on belief; therefore, they argue that it would be less likely to fail than the alternative, i.e. more reliable.


Equivocation

In philosopher
Derek Parfit Derek Antony Parfit (; 11 December 1942 – 1 or 2 January 2017) was a British philosopher who specialised in personal identity, rationality, and ethics. He is widely considered one of the most important and influential moral philosophers of ...
's 2011 book ''
On What Matters ''On What Matters'' is a three-volume book of moral philosophy by Derek Parfit. The first two volumes were published in 2011 and the third in 2017. It is a follow-up to Parfit's 1984 book ''Reasons and Persons''. It has an introduction by Samuel ...
'', Volume 1, Parfit presents an argument against psychological egoism that centers around an apparent equivocation between different senses of the word "want": :The word ''desire'' often refers to our sensual desires or appetites, or to our being attracted to something, by finding the thought of it appealing. I shall use ‘desire’ in a wider sense, which refers to any state of being motivated, or of wanting something to happen and being to some degree disposed to make it happen, if we can. The word ''want'' already has both these senses. :Some people think: ''Whenever people act voluntarily, they are doing what they want to do. Doing what we want is selfish. So everyone always acts selfishly.'' This argument for Psychological Egoism fails, because it uses the word ''want'' first in the wide sense and then in the narrow sense. If I voluntarily gave up my life to save the lives of several strangers, my act would not be selfish, though I would be doing what in the wide sense I wanted to do.


See also

*
Academic careerism Academic careerism is the tendency of academics (professors specifically and intellectuals generally) to pursue their own enrichment and self-advancement at the expense of honest inquiry, unbiased research and dissemination of truth to their student ...
*
Acedia Acedia (; also accidie or accedie , from Latin , and this from Greek , "negligence", "lack of" "care") has been variously defined as a state of listlessness or torpor, of not caring or not being concerned with one's position or condition in th ...
*
Enlightened self-interest Enlightened self-interest is a philosophy in ethics which states that persons who act to further the interests of others (or the interests of the group or groups to which they belong), ultimately serve their own self-interest. It has often been ...
*
Experience machine The experience machine or pleasure machine is a thought experiment put forward by philosopher Robert Nozick in his 1974 book '' Anarchy, State, and Utopia''. It is an attempt to refute ethical hedonism by imagining a choice between everyday real ...
*
Inclusive fitness In evolutionary biology, inclusive fitness is one of two metrics of evolutionary success as defined by W. D. Hamilton in 1964: * Personal fitness is the number of offspring that an individual begets (regardless of who rescues/rears/supports them ...
*
Reward system The reward system (the mesocorticolimbic circuit) is a group of neural structures responsible for incentive salience (i.e., "wanting"; desire or craving for a reward and motivation), associative learning (primarily positive reinforcement and class ...
, for a proposed anatomic basis of psychological egoism. *
Simulated reality The simulation theory is the hypothesis that reality could be simulated—for example by quantum computer simulation—to a degree indistinguishable from "true" reality. It could contain conscious minds that may or may not know that they live i ...


Notes


References

* Baier, Kurt (1990). "Egoism" in ''A Companion to Ethics'', Peter Singer (ed.), Blackwell: Oxford. * Batson, C.D. & L. Shaw (1991). "Evidence for Altruism: Toward a Pluralism of Prosocial Motives," ''Psychological Inquiry'' 2: 107–122. * Bentham, Jeremy (1789). ''Introduction to the Principles of Morals and Legislation''. Oxford: Clarendon Press, 1907. First published in 1789. * Broad, C. D. (1971). "Egoism as a Theory of Human Motives," in his ''Broad's Critical Essays in Moral Philosophy'', London: George Allen and Unwin. *Cialdini, Robert B., S. L. Brown, B. P. Lewis, C. Luce, & S. L. Neuberg (1997). "Reinterpreting the Empathy-Altruism Relationship: When One Into One Equals Oneness". ''Journal of Personality and Social Psychology'', 73 (3): 481–494. * Gallese, V. (2001). "The 'shared manifold' hypothesis". ''Journal of Consciousness Studies'', 8(5-7), 33–50. * Gert, Bernard (1967). "Hobbes and Psychological Egoism", ''Journal of the History of Ideas'', Vol. 28, No. 4, pp. 503–520. * Hazlitt, William (1991). ''Self-Love and Benevolence Selected Writings'', edited and with Introduction by Jon Cook, Oxford University Press. * Hobbes, Thomas (1651). ''Leviathan'',
C. B. Macpherson Crawford Brough Macpherson (1911–1987) was an influential Canadian political scientist who taught political theory at the University of Toronto. Life Macpherson was born on 18 November 1911 in Toronto, Ontario. After graduating from the Univ ...
(ed.), Harmondsworth: Penguin. * Hobbes, Thomas (1654). ''Of Liberty and Necessity'', public domain. * Feinberg, Joel. "Psychological Egoism." In ''Reason & Responsibility: Readings in Some Basic Problems of Philosophy'', edited by Joel Feinberg and
Russ Shafer-Landau Russ Shafer-Landau (born 1963) is an American philosopher and Professor of Philosophy at the University of Wisconsin, Madison. Education and career Shafer-Landau is a graduate of Brown University and completed his PhD work at the University of ...
, 520–532.
California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...
:
Thomson Wadsworth Cengage Group is an American educational content, technology, and services company for the higher education, K-12, professional, and library markets. It operates in more than 20 countries around the world.(Jun 27, 2014Global Publishing Leaders ...
,
2008 File:2008 Events Collage.png, From left, clockwise: Lehman Brothers went bankrupt following the Subprime mortgage crisis; Cyclone Nargis killed more than 138,000 in Myanmar; A scene from the opening ceremony of the 2008 Summer Olympics in Beijing; ...
. * Kaplan, J. T., & Iacoboni, M. (2006). Getting a grip on other minds: Mirror neurons, intention understanding, and cognitive empathy. Social Neuroscience, 1(3/4), 175–183. doi:10.1080/17470910600985605 * Krebs, Dennis (1982). "Psychological Approaches to Altruism: An Evaluation". ''Ethics'', 92, pp. 447–58. * Lloyd, Sharon A. & Sreedhar, Susanne. (2008). "Hobbes's Moral and Political Philosophy", ''The Stanford Encyclopedia of Philosophy'', Edward N. Zalta (ed.).
link
* May, Joshua (2011). "Psychological Egoism", ''The Internet Encyclopedia of Philosophy'', J. Fieser & B. Dowden (eds.).
link
* Mehiel, R. (1997). The consummatory rat: The psychological hedonism of Robert C. Bolles. In M. E. Bouton & M. S. Fanselow (Eds.), Learning, motivation, and cognition: The functional behaviorism of Robert C. Bolles. (Vol. xiii, pp. 271–280). Washington, DC, US: American Psychological Association. * Moseley, Alexander (2006). "Egoism", ''The Internet Encyclopedia of Philosophy'', J. Fieser & B. Dowden (eds.).
link
* O'Keefe, T. (2005). Epicurus. Internet Encyclopedia of Philosophy. Retrieved from http://www.iep.utm.edu/epicur/#SH5a * Shaver, Robert (2002). "Egoism", ''The Stanford Encyclopedia of Philosophy'' (Winter Edition), Edward N. Zalta (ed.).
link
* Sober, E., & Wilson, D. S. (1999). Unto others: the evolution and psychology of unselfish behavior. Cambridge, Mass.: Harvard University Press. * Mees, U., & Schmitt, A. (2008). Goals of action and emotional reasons for action. A modern version of the theory of ultimate psychological hedonism. Journal for the Theory of Social Behaviour, 38(2), 157–178. doi:10.1111/j.1468-5914.2008.00364.x *Sweet, W. (2004). Spencer, Herbert. Internet Encyclopedia of Philosophy. Retrieved from http://www.iep.utm.edu/spencer/ * Wallwork, E. (1991). Psychoanalysis and Ethics. Yale University Press. * Young, P. T. (1936). Motivation of behavior: The fundamental determinants of human and animal activity. (Vol. xviii). Hoboken, NJ, US: John Wiley & Sons Inc.


Further reading

* Baier, Kurt (1990). "Egoism" in ''A Companion to Ethics'', Peter Singer (ed.), Blackwell: Oxford. * Batson, C.D. & L. Shaw (1991). "Evidence for Altruism: Toward a Pluralism of Prosocial Motives," ''Psychological Inquiry'' 2: 107–122. * Broad, C. D. (1971). "Egoism as a Theory of Human Motives," in his ''Broad's Critical Essays in Moral Philosophy'', London: George Allen and Unwin. * Hobbes, Thomas (1651). ''Leviathan'',
C. B. Macpherson Crawford Brough Macpherson (1911–1987) was an influential Canadian political scientist who taught political theory at the University of Toronto. Life Macpherson was born on 18 November 1911 in Toronto, Ontario. After graduating from the Univ ...
(ed.), Harmondsworth: Penguin. * Hobbes, Thomas (1654). ''Of Liberty and Necessity'', public domain. * Krebs, Dennis (1982). "Psychological Approaches to Altruism: An Evaluation". ''Ethics'', 92, pp. 447–58. * May, Joshua (2011). "Psychological Egoism", ''The Internet Encyclopedia of Philosophy'', J. Fieser & B. Dowden (eds.).
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* * * {{DEFAULTSORT:Psychological Egoism Individualism Narcissism Theory of mind