Received: JanuAccepted: SeptemPublished: October 3, 2018Ĭopyright: © 2018 Gao, Tomonaga. PLoS ONE 13(10):Įditor: Elsa Addessi, Consiglio Nazionale delle Ricerche, ITALY The results also revealed the functions of faces and body contours in configural processing by chimpanzees.Ĭitation: Gao J, Tomonaga M (2018) The body inversion effect in chimpanzees ( Pan troglodytes). The results show that chimpanzees share configural body processing with humans and that bodies are special to them compared with other objects. Our results reflected the body inversion effect for intact chimpanzee bodies, bodies with complete body contours, and bodies with clear faces but not for the objects and other conditions that did not present complete body contours and clear faces. We tested seven chimpanzees using upright and inverted chimpanzee body stimuli and other stimuli in matching-to-sample tasks to examine the body inversion effect and the body parts that invoke it. However, it is not known if this type of body processing exists in non-human primates. This inversion effect suggests the configural processing of bodies, which is different from the processing used for other objects. Body recognition in humans is deteriorated by inversion. Bodies are important social cues for animals.
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