Evolution of indirect reciprocity by image scoring

Darwinian evolution has to provide an explanation for cooperative behaviour. Theories of cooperation are based on kin selection (dependent on genetic relatedness),, group selection and reciprocal altruism. The idea of reciprocal altruism usually involves direct reciprocity: repeated encounters between the same individuals allow for the return of an altruistic act by the recipient. Here we present a new theoretical framework, which is based on indirect reciprocity and does not require the same two individuals ever to meet again. Individual selection can nevertheless favour cooperative strategies directed towards recipients that have helped others in the past. Cooperation pays because it confers the image of a valuable community member to the cooperating individual. We present computer simulations and analytic models that specify the conditions required for evolutionary stability of indirect reciprocity. We show that the probability of knowing the ‘image’ of the recipient must exceed the cost-to-benefit ratio of the altruistic act. We propose that the emergence of indirect reciprocity was a decisive step for the evolution of human societies.

[1]  W. Hamilton The Evolution of Altruistic Behavior , 1963, The American Naturalist.

[2]  W. Hamilton The genetical evolution of social behaviour. I. , 1964, Journal of theoretical biology.

[3]  R. Trivers The Evolution of Reciprocal Altruism , 1971, The Quarterly Review of Biology.

[4]  George Williams Group Selection , 1971 .

[5]  I. Eshel On the neighbor effect and the evolution of altruistic traits. , 1972, Theoretical population biology.

[6]  J M Smith,et al.  Evolution and the theory of games , 1976 .

[7]  J. Krebs,et al.  An introduction to behavioural ecology , 1981 .

[8]  W. Hamilton,et al.  The Evolution of Cooperation , 1984 .

[9]  Marcus W. Feldman,et al.  The Evolution of Helping Behavior in Large, Randomly Mixed Populations , 1986, American Naturalist.

[10]  R. D. Alexander The biology of moral systems , 1989 .

[11]  L. Buss,et al.  The evolution of individuality , 1987 .

[12]  R. May More evolution of cooperation , 1987, Nature.

[13]  M. Milinski TIT FOR TAT in sticklebacks and the evolution of cooperation , 1987, Nature.

[14]  Carol Barner-Barry,et al.  The Biology of Moral Systems Richard D. Alexander New York: Aldine De Gruyter, 1987 , 1988, Politics and the Life Sciences.

[15]  P. Richerson,et al.  The evolution of indirect reciprocity , 1989 .

[16]  Lee Alan Dugatkin,et al.  Reciprocity and the emergence of reputation , 1992 .

[17]  Ken Binmore,et al.  Fun and games : a text on game theory , 1992 .

[18]  A I Houston,et al.  Beyond the prisoner's dilemma: Toward models to discriminate among mechanisms of cooperation in nature. , 1992, Trends in ecology & evolution.

[19]  M. Nowak,et al.  Evolutionary games and spatial chaos , 1992, Nature.

[20]  M. Nowak,et al.  Tit for tat in heterogeneous populations , 1992, Nature.

[21]  M. Nowak,et al.  A strategy of win-stay, lose-shift that outperforms tit-for-tat in the Prisoner's Dilemma game , 1993, Nature.

[22]  E. Sober,et al.  Reintroducing group selection to the human behavioral sciences , 1994 .

[23]  The origin of synergistic symbiosis. , 1995, Journal of theoretical biology.

[24]  Amots Zehavi,et al.  The Handicap Principle: A Missing Piece of Darwin's Puzzle , 1997 .

[25]  Josef Hofbauer,et al.  Evolutionary Games and Population Dynamics , 1998 .

[26]  M A Nowak,et al.  The dynamics of indirect reciprocity. , 1998, Journal of theoretical biology.