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An inversion effect modified by expertise in capuchin monkeys.

Jennifer J Pokorny¹, Christine E Webb, Frans B M de Waal

¹Department of Psychology, Living Links, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road, Atlanta, GA 30329, USA. jpokorn@emory.edu

Animal Cognition

|May 17, 2011

Summary

This summary is machine-generated.

The face inversion effect impairs recognition of rotated faces. Capuchin monkeys showed this effect for familiar faces, suggesting expertise influences face processing.

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Area of Science:

Cognitive Psychology
Neuroscience
Primate Behavior

Background:

The face inversion effect, a deficit in recognizing faces rotated 180°, is often linked to specialized face-processing mechanisms.
This effect is typically more pronounced for faces than other objects, indicating unique perceptual processing for facial stimuli.

Purpose of the Study:

To investigate the face inversion effect in brown capuchin monkeys (Cebus apella).
To determine if the face inversion effect is specific to stimuli with which subjects have developed expertise.

Main Methods:

Four brown capuchin monkeys were presented with upright and inverted stimuli in an oddity task.
Stimuli included capuchin faces, human faces, chimpanzee faces, and automobiles.

Main Results:

Monkeys performed significantly better when recognizing upright capuchin and human faces compared to inverted ones.
No significant difference in performance was observed for inverted versus upright chimpanzee faces or automobiles.

Conclusions:

The findings support the hypothesis that the face inversion effect is related to perceptual expertise.
This suggests that specialized processing for faces, including the inversion effect, may extend to non-human primates with sufficient experience.