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Related Experiment Videos

Do chimpanzees know what conspecifics know?

Brian Hare1, Josep Call, Michael Tomasello

  • 1Department of Psychology and Yerkes Regional Primate Research Center, Emory University

Animal Behaviour
|February 15, 2001
PubMed
Summary
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Chimpanzees use social problem-solving skills, understanding what competitors see to gain advantages. They strategically retrieve hidden food based on a dominant

Area of Science:

  • Primate cognition
  • Animal behavior
  • Social problem solving

Background:

  • Understanding the cognitive abilities of non-human primates is crucial for evolutionary psychology.
  • Social problem solving in chimpanzees (Pan troglodytes) involves complex interactions and competition.

Purpose of the Study:

  • To investigate whether chimpanzees can discern what competitors see or do not see.
  • To determine if chimpanzees use this knowledge to inform their competitive strategies.

Main Methods:

  • Three experiments were conducted involving subordinate and dominant chimpanzees competing for food.
  • Food placement and visibility to dominant individuals were manipulated.
  • Subordinate chimpanzees' approach and retrieval behaviors were observed.

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Main Results:

  • Subordinates preferentially retrieved food that dominant competitors had not seen hidden or moved.
  • Chimpanzees adjusted their behavior when the observer dominant changed, indicating tracking of visual access.
  • Performance varied in one experiment, likely due to altered competitive dynamics rather than cognitive deficit.

Conclusions:

  • Chimpanzees possess the ability to understand the visual perspective of conspecifics in competitive contexts.
  • This understanding is applied to develop effective social-cognitive strategies.
  • Findings suggest sophisticated theory of mind-like abilities in chimpanzees.