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Related Experiment Videos

Are apes really inequity averse?

Juliane Bräuer1, Josep Call, Michael Tomasello

  • 1Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany. jbraeuer@eva.mpg.de

Proceedings. Biological Sciences
|October 4, 2006
PubMed
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Great apes do not show inequity aversion. Instead, observing a conspecific receive better food triggers a food expectation hypothesis, leading to increased begging and attention, not rejection.

Area of Science:

  • Primate behavior
  • Comparative psychology
  • Animal cognition

Background:

  • Previous research suggested chimpanzees exhibit inequity aversion, rejecting unequal food distribution.
  • Inequity aversion was hypothesized as a driver for fairness in social interactions.

Purpose of the Study:

  • To investigate inequity aversion in other great ape species.
  • To examine the influence of competitor relationships on fairness-related behaviors.
  • To test alternative explanations for observed food distribution responses.

Main Methods:

  • Controlled experiments presenting unequal food rewards to different great ape subjects.
  • Observational analysis of food rejection, attention, and begging behaviors.
  • Comparison of responses across different ape species and competitor relationships.

Related Experiment Videos

Main Results:

  • Apes showed decreased food rejection compared to previous studies.
  • Subjects exhibited increased attention and begging when a conspecific received better food.
  • Results contradicted the inequity aversion hypothesis.

Conclusions:

  • The food expectation hypothesis provides a more plausible explanation for observed behaviors.
  • Great apes' responses are driven by the expectation of receiving similar rewards, not aversion to inequity.
  • Social dynamics and individual expectations influence fairness-related behaviors in great apes.