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Published in: Brain Structure and Function 9/2017

01-12-2017 | Original Article

The occipital face area is causally involved in the formation of identity-specific face representations

Authors: Géza Gergely Ambrus, Maria Dotzer, Stefan R. Schweinberger, Gyula Kovács

Published in: Brain Structure and Function | Issue 9/2017

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Abstract

Transcranial magnetic stimulation (TMS) and neuroimaging studies suggest a role of the right occipital face area (rOFA) in early facial feature processing. However, the degree to which rOFA is necessary for the encoding of facial identity has been less clear. Here we used a state-dependent TMS paradigm, where stimulation preferentially facilitates attributes encoded by less active neural populations, to investigate the role of the rOFA in face perception and specifically in image-independent identity processing. Participants performed a familiarity decision task for famous and unknown target faces, preceded by brief (200 ms) or longer (3500 ms) exposures to primes which were either an image of a different identity (DiffID), another image of the same identity (SameID), the same image (SameIMG), or a Fourier-randomized noise pattern (NOISE) while either the rOFA or the vertex as control was stimulated by single-pulse TMS. Strikingly, TMS to the rOFA eliminated the advantage of SameID over DiffID condition, thereby disrupting identity-specific priming, while leaving image-specific priming (better performance for SameIMG vs. SameID) unaffected. Our results suggest that the role of rOFA is not limited to low-level feature processing, and emphasize its role in image-independent facial identity processing and the formation of identity-specific memory traces.
Footnotes
1
Note, however that the neural mechanisms of RS are under heavy discussion (see Barron et al. 2016; Kar and Krekelberg 2016; Vogels 2016 for recent reviews).
 
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Metadata
Title
The occipital face area is causally involved in the formation of identity-specific face representations
Authors
Géza Gergely Ambrus
Maria Dotzer
Stefan R. Schweinberger
Gyula Kovács
Publication date
01-12-2017
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 9/2017
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-017-1467-2

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