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Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: The organization of conspecific face space in nonhuman primates
Authors: Parr, Lisa A
Taubert, Jessica
Little, Anthony
Hancock, Peter J B
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Keywords: Face space
Multidimensional scaling
Face identity
Rhesus monkey
Species differences
Issue Date: Jun-2012
Publisher: Taylor and Francis
Citation: Parr LA, Taubert J, Little A & Hancock PJB (2012) The organization of conspecific face space in nonhuman primates, Quarterly Journal of Experimental Psychology, 65 (12), pp. 2411-2434.
Abstract: Humans and chimpanzees demonstrate numerous cognitive specializations for processing faces, but comparative studies with monkeys suggest that these may be the result of recent evolutionary adaptations. The present study utilized the novel approach of face space, a powerful theoretical framework used to understand the representation of face identity in humans, to further explore species differences in face processing. According to the theory, faces are represented by vectors in a multidimensional space, the centre of which is defined by an average face. Each dimension codes features important for describing a face's identity, and vector length codes the feature's distinctiveness. Chimpanzees and rhesus monkeys discriminated male and female conspecifics' faces, rated by humans for their distinctiveness, using a computerized task. Multidimensional scaling analyses showed that the organization of face space was similar between humans and chimpanzees. Distinctive faces had the longest vectors and were the easiest for chimpanzees to discriminate. In contrast, distinctiveness did not correlate with the performance of rhesus monkeys. The feature dimensions for each species' face space were visualized and described using morphing techniques. These results confirm species differences in the perceptual representation of conspecific faces, which are discussed within an evolutionary framework.
Type: Journal Article
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Rights: This is an Author's Accepted Manuscript of an article published in The Quarterly Journal of Experimental Psychology, Volume 65, Issue 12, 2012, pp.2411-2434 copyright Taylor & Francis, available online at:
Affiliation: Emory University
Emory University

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