|
Reciprocal Altruism
In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar manner at a later time. The concept was initially developed by Robert Trivers to explain the evolution of cooperation as instances of mutually altruistic acts. The concept is close to the strategy of " tit for tat" used in game theory. In 1987 Trivers told a symposium on reciprocity that he had originally submitted his article under the title "The Evolution of Delayed Return Altruism", but reviewer W. D. Hamilton suggested that he change the title to "The Evolution of Reciprocal Altruism". Trivers changed the title, but not the examples in the manuscript, which has led to confusion about what were appropriate examples of reciprocal altruism for the last 50 years. In their contribution to that symposium, Rothstein and Pierotti (1988) ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reciprocal Altruism Summary
Reciprocal may refer to: In mathematics * Multiplicative inverse, in mathematics, the number 1/''x'', which multiplied by ''x'' gives the product 1, also known as a ''reciprocal'' * Reciprocal polynomial, a polynomial obtained from another polynomial by reversing its coefficients * Reciprocal rule, a technique in calculus for calculating derivatives of reciprocal functions * Reciprocal spiral, a plane curve * Reciprocal averaging, a statistical technique for aggregating categorical data In science and technology * Reciprocal aircraft heading, 180 degrees (the opposite direction) from a stated heading * Reciprocal lattice, a basis for the dual space of covectors, in crystallography * Reciprocal length, a measurement used in science * Reciprocating engine or piston engine * Reciprocating oscillation in physical wave theory Life sciences and medicine * Hybrid (biology), in genetics, the result of a reciprocal pair of crossings, forming ''reciprocal hybrids'' * Reciprocal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Primates (journal)
''Primates'' is a bimonthly peer-reviewed scientific journal of primatology, and an official journal of the Japan Monkey Center at Kyoto University. It publishes original papers that cover all aspects of the study of primates. The journal publishes original research articles, reviews, news and perspectives, and book reviews. It was established in 1957 by Kinji Imanishi. Although the first volume contained both articles in Japanese or English, subsequent volumes were published in English, thanks to a grant from the Rockefeller Foundation. It is now published by Springer Springer or springers may refer to: Publishers * Springer Science+Business Media, aka Springer International Publishing, a worldwide publishing group founded in 1842 in Germany formerly known as Springer-Verlag. ** Springer Nature, a multinationa ... and the current editor-in-chief is Masayuki Nakamichi ( Osaka University). According to the '' Journal Citation Reports'', the journal has a 2020 impact facto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reciprocity (social Psychology)
In social psychology, reciprocity is a social norm of responding to a positive action with another positive action, rewarding kind actions. As a social construct, reciprocity means that in response to friendly actions, people are frequently much nicer and much more cooperative than predicted by the self-interest model; conversely, in response to hostile actions they are frequently much more nasty and even brutal. Reciprocity makes it possible to build continuing relationships and exchanges. Francis Fukuyama states that “If the institutions of democracy and capitalism are to work properly, they must coexist within certain premodern cultural habits that ensure their proper functioning” (p. 11). He goes on to say “Law, contract, and economic rationality and prosperity…. must as well be leavened with reciprocity, moral obligation, duty toward community, and trust…. The latter are not anachronisms in a modern society but rather the sine qua non of the latter’s success� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Psychological Egoism
Psychological egoism is the view that humans are always motivated by self-interest and selfishness, even in what seem to be acts of altruism. 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 rather than normative 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 and rational egoism. 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 or to avoid pain. Immediate gratification can be sacrificed for a chance of greater, future pleasure. Further, humans are not motivated to strictly avoid pain and only pur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norm Of Reciprocity
The norm of reciprocity requires that we repay in kind what another has done for us.Whatley, M, A., Rhodes, A., Smith, R. H., Webster, J. M. (1999) ''The Effect of a Favor on Public and Private Compliance: How Internalized is the Norm of Reciprocity?''. Basic and Applied Social Psychology, 21(3), 251–259 It can be understood as the expectation that people will respond favorably to each other by returning benefits for benefits, and responding with either indifference or hostility to harms. The social norm of reciprocity often takes different forms in different areas of social life, or in different societies. All of them, however, are distinct from related ideas such as gratitude, the Golden Rule, or mutual goodwill. See reciprocity (social and political philosophy) for an analysis of the concepts involved. The norm of reciprocity mirrors the concept of reciprocal altruism in evolutionary biology. However, evolutionary theory and therefore sociobiology was not well received by mai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Factor Of Evolution
A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey a and single-storey ɑ. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English grammar, " a", and its variant " an", are indefinite articles. History The earliest certain ancestor of "A" is aleph (also written 'aleph), the first letter of the Phoenician alphabet, which consisted entirely of consonants (for that reason, it is also called an abjad to distinguish it f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Koinophilia
Koinophilia is an evolutionary hypothesis proposing that during sexual selection, animals preferentially seek mates with a minimum of unusual or mutant features, including functionality, appearance and behavior. Koinophilia intends to explain the clustering of sexual organisms into species and other issues described by Darwin's Dilemma. The term derives from the Greek word ''koinos'' meaning "common" or "that which is shared", and ''philia'', meaning "fondness". Natural selection causes beneficial inherited features to become more common at the expense of their disadvantageous counterparts. The koinophilia hypothesis proposes that a sexually-reproducing animal would therefore be expected to avoid individuals with rare or unusual features, and to prefer to mate with individuals displaying a predominance of common or average features. Mutants with strange, odd or peculiar features would be avoided because most mutations that manifest themselves as changes in appearance, functio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iterated Prisoner's Dilemma
The Prisoner's Dilemma is an example of a game analyzed in game theory. It is also a thought experiment that challenges two completely rational agents to a dilemma: cooperate with their partner for mutual reward, or betray their partner ("defect") for individual reward. This dilemma was originally framed by Merrill Flood and Melvin Dresher while working at RAND in 1950. Albert W. Tucker appropriated the game and formalized it by structuring the rewards in terms of prison sentences and named it "prisoner's dilemma". William Poundstone in his 1993 book ''Prisoner's Dilemma'' writes the following version:Two members of a criminal gang are arrested and imprisoned. Each prisoner is in solitary confinement with no means of speaking to or exchanging messages with the other. The police admit they don't have enough evidence to convict the pair on the principal charge. They plan to sentence both to two years in prison on a lesser charge. Simultaneously, the police offer each prisone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gift Economy
A gift economy or gift culture is a system of exchange where Anthropological theories of value, valuables are not sold, but rather given without an explicit agreement for immediate or future rewards. Social norms and customs govern giving a gift in a gift culture; although there is some expectation of reciprocity, gifts are not given in an explicit exchange of goods or services for money, or some other commodity or service.R. Kranton: ''Reciprocal exchange: a self-sustaining system'', American Economic Review, V. 86 (1996), Issue 4 (September), pp. 830–851 This contrasts with a barter economy or a market economy, where goods and services are primarily explicitly exchanged for value received. The nature of gift economies is the subject of a foundational debate in anthropology. Anthropological research into gift economies began with Bronisław Malinowski's description of the Kula ring in the Trobriand Islands during World War I. The Kula trade appeared to be gift-like since Trobri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolutionary Models Of Food Sharing
Evolutionary biologists have developed various theoretical models to explain the evolution of food-sharing behavior—"the unresisted transfer of food from one food-motivated individual to another"— among humans and other animals. Models of food-sharing are based upon general evolutionary theory. When applied to human behavior, these models are considered a branch of human behavioral ecology. Several types of food-sharing models have been developed, including kin selection, reciprocal altruism, tolerated theft, group cooperation, and costly signaling. Kin selection and reciprocal altruism models of food-sharing are based upon evolutionary concepts of kin selection and altruism. Since the theoretical basis of these models is formulated around reproductive fitness, one underlying assumption of these models is that greater resource accumulation increases reproductive fitness. Food-sharing has been theorized as an important development in early human evolution. Kin selection m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 simply expressed by the belief that an individual, group, or even a commercial entity will ''"do well by doing good"''. The term enlightened self-interest has been criticised as a mere ideological or semantic device of neoclassical economic theory to justify this type of behaviour. It has been considered at best a variant of self-interest that is unsuitable for the establishment of personal and public relations, because like the definition of self-interest in the standard rational choice model, it fails to characterise human behaviour ethically, psychologically and cognitivel Related and contrasting concepts Unenlightened self-interest In contrast to ''enlightened'' self-interest is simple greed, or the concept of "''unenlightened'' self- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Competitive Altruism
Competitive altruism is a possible mechanism for the persistence of cooperative behaviors, specifically those that are performed unconditionally. The theory of reciprocal altruism can be used to explain behaviors that are performed by a donor who receives some sort of benefit in the future. When no such compensation is received, however, reciprocity fails to explain altruistic behavior. Characteristics To explain competitive altruism, RobertsRoberts, G. 1998. Competitive altruism: from reciprocity to the handicap principle. Proc. R. Soc. Lond., B 265: 429-430. uses the example of preening among birds. Because certain birds cannot reach parasites on all parts of their bodies, particularly their necks, they benefit from preening one another. For any given bird, there is an entire flock of potential preeners, who compete in hopes of establishing a beneficial relationship. Cheaters, or those birds that try to be preened without preening others, do not compete and thus are excluded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
