Journal
AMERICAN JOURNAL OF PRIMATOLOGY
Volume 71, Issue 2, Pages 175-181Publisher
WILEY
DOI: 10.1002/ajp.20639
Keywords
inequity aversion; social cognition; prosocial behavior; other regarding preferences; fairness
Categories
Funding
- American Society of Primatologists (ASP)
- Ethical Treatment of Non-Human Primates
- Psychology of the Max Planck Institute for Evolutionary Anthropology
- Leipzig Zoo. Furthermore
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Recent studies have produced mixed evidence about inequity aversion in nonhuman primates. Brosnan et al. [Proceedings of the Royal Society of London. Series B. Biological Sciences 272:253-258, 2005] found inequity aversion in chimpanzees and argued that effort is crucial, if subjects are to evaluate how they are rewarded in comparison to a competitor for an identical performance. In this study we investigated inequity aversion with chimpanzees, bonobos and orangutans, using the method of Brosnan et al. [Proceedings of the Royal Society of London. Series B. Biological Sciences 272:253-258, 2005] after introducing some methodological improvements. Subjects always received a less-preferred food in exchange for a token, whereas the competitor received either the same type of food for their token (equity) or a more favored food for it (inequity). Apes did not refuse more of the less-preferred food when a competitor had received the more favored food. Thus, with an improved methodology we failed to reproduce the findings of Brosnan et al. [Proceedings of the Royal Society of London. Series B. Biological Sciences 272:253-258, 2005] that apes show inequity aversion. Am. J. Primatol. 71:175-181, 2009. (C) 2008 Wiley-Liss, Inc.
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