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Dissociable Neural Patterns of Facial Identity across Changes in Viewpoint

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Natu, Vaidehi S. Jiang, Fang [UCL] Narvekar, Abhijit Keshvari, Shaiyan Blanz, Volker O'Toole, Alice J.

We examined the neural response patterns for facial identity independent of viewpoint and for viewpoint independent of identity. Neural activation patterns for identity and viewpoint were collected in an fMRI experiment. Faces appeared in identityconstant blocks, with variable viewpoint, and in viewpoint-constant blocks, with variable identity. Pattern-based classifiers were used to discriminate neural response patterns for all possible pairs of identities and viewpoints. To increase the likelihood of detecting distinct neural activation patterns for identity, we tested maximally dissimilar "face"-"antiface" pairs and normal face pairs. Neural response patterns for four of six identity pairs, including the "face"-"antiface" pairs, were discriminated at levels above chance. A behavioral experiment showed accord between perceptual and neural discrimination, indicating that the classifier tapped a high-level visual identity code. Neural activity patterns across a broad span of ventral temporal (VT) cortex, including fusiform gyrus and lateral occipital areas (LOC), were required for identity discrimination. For viewpoint, five of six viewpoint pairs were discriminated neurally. Viewpoint discrimination was most accurate with a broad span of VT cortex, but the neural and perceptual discrimination patterns differed. Less accurate discrimination of viewpoint, more consistent with human perception, was found in right posterior superior temporal sulcus, suggesting redundant viewpoint codes optimized for different functions. This study provides the first evidence that it is possible to dissociate neural activation patterns for identity and viewpoint independently.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2010
Language Anglais
Journal information "Journal of Cognitive Neuroscience" - Vol. 22, no. 7, p. 1570-1582 (2010)
Peer reviewed yes
Publisher M I T Press (Cambridge)
issn 0898-929X
e-issn 1530-8898
Publication status Publié
Affiliation UCL
Links
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Bibliographic reference Natu, Vaidehi S. ; Jiang, Fang ; Narvekar, Abhijit ; Keshvari, Shaiyan ; Blanz, Volker ; et. al. Dissociable Neural Patterns of Facial Identity across Changes in Viewpoint. In: Journal of Cognitive Neuroscience, Vol. 22, no. 7, p. 1570-1582 (2010)
Permanent URL http://hdl.handle.net/2078.1/34678