Sep
21

Ig Nobel Price in Anatomy 2012: Frans de Waal and Jennifer Pokorny for discovering chimpanzees can identify other chimpanzees individually from seeing photographs of their rear ends (anogenital region). —- Photo: Pan troglodytes schweinfurthii Source (BioLib) —- More: Ceremony Paper from Advanced Science Letters.- Faces and Behinds: Chimpanzee Sex Perception. Abstract Six adult chimpanzees (Pan troglodytes) trained on computerized matching-to-sample were shown a sample behind (anogenital region) of a chimpanzee and rewarded for selecting a corresponding facial image. If the two faces were of the same sex, and one belonged to the same individual as the behind, subjects made the correct association for familiar individuals but not unfamiliar ones, suggesting whole-body knowledge of group mates. If the two faces were of opposite sex, subjects selected the same-sex face as the behind at first only for familiar individuals when face and behind belonged to the same individual. During subsequent exposures, however, they learned to associate the same-sex face with the behind even if the behind was generic” male or female (i.e., unmatched to any known individual) provided the depicted individuals were familiar. This suggests that sex perception is aided by a “gender construct” derived from firsthand experience with group mates, and which construct is unavailable for unfamiliar individuals.

Ig Nobel Price in Anatomy 2012: Frans de Waal and Jennifer Pokorny for discovering chimpanzees can identify other chimpanzees individually from seeing photographs of their rear ends (anogenital region).

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Photo: Pan troglodytes schweinfurthii

Source (BioLib)

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More:

Ceremony

Paper from Advanced Science Letters.- Faces and Behinds: Chimpanzee Sex Perception.

Abstract

Six adult chimpanzees (Pan troglodytes) trained on computerized matching-to-sample were shown a sample behind (anogenital region) of a chimpanzee and rewarded for selecting a corresponding facial image. If the two faces were of the same sex, and one belonged to the same individual as the behind, subjects made the correct association for familiar individuals but not unfamiliar ones, suggesting whole-body knowledge of group mates. If the two faces were of opposite sex, subjects selected the same-sex face as the behind at first only for familiar individuals when face and behind belonged to the same individual. During subsequent exposures, however, they learned to associate the same-sex face with the behind even if the behind was generic” male or female (i.e., unmatched to any known individual) provided the depicted individuals were familiar. This suggests that sex perception is aided by a “gender construct” derived from firsthand experience with group mates, and which construct is unavailable for unfamiliar individuals.

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    Identify individuals based on seeing only their rear ends? “Well. Yeah. Duh.” (Say any and all of us who have worked...
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    Love Frans de Waal.
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