An inversion effect modified by expertise in capuchin monkeys |
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Authors: | Jennifer J Pokorny Christine E Webb Frans B M de Waal |
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Institution: | (1) Department of Psychology, Living Links, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road, Atlanta, GA 30329, USA |
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Abstract: | The face inversion effect may be defined as the general impairment in recognition that occurs when faces are rotated 180°.
This phenomenon seems particularly strong for faces as opposed to other objects and is often used as a marker of a specialized
face-processing mechanism. Four brown capuchin monkeys (Cebus apella) were tested on their ability to discriminate several classes of facial and non-facial stimuli presented in both their upright
and inverted orientations in an oddity task. Results revealed significantly better performance on upright than inverted presentations
of capuchin and human face stimuli, but not on chimpanzee faces or automobiles. These data support previous studies in humans
and other primates suggesting that the inversion effect occurs for stimuli for which subjects have developed an expertise. |
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