Primate Research Supplement
The 39th Congress Primate Society of Japan
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Poster Presentation
Body part categorization in chimpanzees
Jie GAOIkuma ADACHI
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CONFERENCE PROCEEDINGS FREE ACCESS

Pages 51

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Abstract

Knowledge about body part categorizations could potentially help with animals’ individual and species discrimination, gesture and action understanding, and other important processes involving body perception. In this study, we tested whether humans’ closest living relatives, chimpanzees, are able to categorize body parts as humans do. Six chimpanzees were first trained to perform a body-part matching-to-sample task. After passing the criterion, they received test trials, which included both same-individual and different-individual matching, using novel stimuli that were different from those in the training phase. Overall, the participants showed significantly better performances than the chance level in the task. For each body part, they have better performances than the chance level as well. They made the most errors in the arm-leg pair, and a multi-dimensional scaling analysis showed the same result, with the torso, head, and limbs being apart, but arms and legs being close to each other. The results suggest that chimpanzees are able to match body parts even across different chimpanzee individuals, and that their body categorization is likely to be torso, heads, and limbs. This indicates that the knowledge about body parts may play an important role in their lives. We hope this study could shed light on investigations on the evolution of body perception in primates.

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© 2023 by Primate Society of Japan
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