In the experiment, chimpanzees had to pick the face, butt or foot that that they had seen earlier. Leiden University and Primate Research Institute/Kyoto Univ.
Humans displayed the inversion effect for human faces only, while chimps did so for chim...hinds and, perhaps, faces (though the evidence isn’t a strong for that), Kret and Tomonaga report November 30 in PLOS ONE.







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They started by gathering a group of more than 100 university students and giving them a matching game. The student would be shown a picture of a human or chimp face, butt or foot. Then they would be shown two pictures of the same body part (from the same species) and have to choose the one that matched the first image. Some of those images were right side up and others were turned upside down. The researchers then repeated the experiment with images in black and white and then repeated both experiments again with a group of four female chimps and one male chimp living at the Primate Research Institute.
Given the evidence that chimps could use both face and behind for recognition, Mariska Kret of Leiden University in the Netherlands and Masaki Tomonaga of the Primate Research Institute at Kyoto University in Japan wanted to know if, like us, chimpanzees display the inversion effect when it comes to these body parts — and how humans might compare.



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