OpenAccessBelV2, Main, Exploration, bibRecord, 001480

Distinct and Convergent Visual Processing of High and Low Spatial Frequency Information in Faces

Identifieur interne : 001480 ( Main/Exploration ); précédent : 001479; suivant : 001481

Distinct and Convergent Visual Processing of High and Low Spatial Frequency Information in Faces

Auteurs : Pia Rotshtein [Royaume-Uni] ; Patrik Vuilleumier [Suisse] ; Joel Winston [Royaume-Uni] ; Jon Driver [Royaume-Uni] ; Ray Dolan [Royaume-Uni]

Source :

Cerebral Cortex [ 1047-3211 ] ; 2007-02-05.

RBID : ISTEX:7D012D7A5C8C5682ED9700F06EEF2AC7FDF2F56D

Abstract

We tested for differential brain response to distinct spatial frequency (SF) components in faces. During a functional magnetic resonance imaging experiment, participants were presented with hybrid faces containing superimposed low and high SF information from different identities. We used a repetition paradigm where faces at either SF range were independently repeated or changed across consecutive trials. In addition, we manipulated which SF band was attended. Our results suggest that repetition and attention affected partly overlapping occipitotemporal regions but did not interact. Changes of high SF faces increased responses of the right inferior occipital gyrus (IOG) and left inferior temporal gyrus (ITG), with the latter response being also modulated additively by attention. In contrast, the bilateral middle occipital gyrus (MOG) responded to repetition and attention manipulations of low SF. A common effect of high and low SF repetition was observed in the right fusiform gyrus (FFG). Follow-up connectivity analyses suggested direct influence of the MOG (low SF), IOG, and ITG (high SF) on the FFG responses. Our results reveal that different regions within occipitotemporal cortex extract distinct visual cues at different SF ranges in faces and that the outputs from these separate processes project forward to the right FFG, where the different visual cues may converge.

Url:

https://api.istex.fr/document/7D012D7A5C8C5682ED9700F06EEF2AC7FDF2F56D/fulltext/pdf

DOI: 10.1093/cercor/bhl180

Affiliations:

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Le document en format XML

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<front><div type="abstract">We tested for differential brain response to distinct spatial frequency (SF) components in faces. During a functional magnetic resonance imaging experiment, participants were presented with hybrid faces containing superimposed low and high SF information from different identities. We used a repetition paradigm where faces at either SF range were independently repeated or changed across consecutive trials. In addition, we manipulated which SF band was attended. Our results suggest that repetition and attention affected partly overlapping occipitotemporal regions but did not interact. Changes of high SF faces increased responses of the right inferior occipital gyrus (IOG) and left inferior temporal gyrus (ITG), with the latter response being also modulated additively by attention. In contrast, the bilateral middle occipital gyrus (MOG) responded to repetition and attention manipulations of low SF. A common effect of high and low SF repetition was observed in the right fusiform gyrus (FFG). Follow-up connectivity analyses suggested direct influence of the MOG (low SF), IOG, and ITG (high SF) on the FFG responses. Our results reveal that different regions within occipitotemporal cortex extract distinct visual cues at different SF ranges in faces and that the outputs from these separate processes project forward to the right FFG, where the different visual cues may converge.</div>
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Distinct and Convergent Visual Processing of High and Low Spatial Frequency Information in Faces

Distinct and Convergent Visual Processing of High and Low Spatial Frequency Information in Faces

Source :

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri