The face inversion effect in non-human primates revisited-an investigation in chimpanzees (Pan troglodytes)

Christoph D. Dahl, Malte J. Rasch, Masaki Tomonaga, Ikuma Adachi

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19 Citations (Scopus)

Abstract

Faces presented upside-down are harder to recognize than presented right-side up, an effect known as the face inversion effect. With inversion the perceptual processing of the spatial relationship among facial parts is disrupted. Previous literature indicates a face inversion effect in chimpanzees toward familiar and conspecific faces. Although these results are not inconsistent with findings from humans they have some controversy in their methodology. Here, we employed a delayed matching-to-sample task to test captive chimpanzees on discriminating chimpanzee and human faces. Their performances were deteriorated by inversion. More importantly, the discrimination deterioration was systematically different between the two age groups of chimpanzee participants, i.e. young chimpanzees showed a stronger inversion effect for chimpanzee than for human faces, while old chimpanzees showed a stronger inversion effect for human than for chimpanzee faces. We conclude that the face inversion effect in chimpanzees is modulated by the level of expertise of face processing.

Original languageEnglish
Article number2504
JournalScientific Reports
Volume3
DOIs
Publication statusPublished - Sep 5 2013
Externally publishedYes

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Pan troglodytes
Primates
Age Groups

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The face inversion effect in non-human primates revisited-an investigation in chimpanzees (Pan troglodytes). / Dahl, Christoph D.; Rasch, Malte J.; Tomonaga, Masaki; Adachi, Ikuma.

In: Scientific Reports, Vol. 3, 2504, 05.09.2013.

Research output: Contribution to journalArticle

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