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Separate channels for processing form, texture, and color: Evidence from fMRI adaptation and visual object agnosia

Cavina-Pratesi, C.; Kentridge, R.W.; Heywood, C.A.; Milner, A.D.

Separate channels for processing form, texture, and color: Evidence from fMRI adaptation and visual object agnosia Thumbnail


Authors

C. Cavina-Pratesi

C.A. Heywood

A.D. Milner



Abstract

Previous neuroimaging research suggests that although object shape is analyzed in the lateral occipital cortex, surface properties of objects, such as color and texture, are dealt with in more medial areas, close to the collateral sulcus (CoS). The present study sought to determine whether there is a single medial region concerned with surface properties in general or whether instead there are multiple foci independently extracting different surface properties. We used stimuli varying in their shape, texture, or color, and tested healthy participants and 2 object-agnosic patients, in both a discrimination task and a functional MR adaptation paradigm. We found a double dissociation between medial and lateral occipitotemporal cortices in processing surface (texture or color) versus geometric (shape) properties, respectively. In Experiment 2, we found that the medial occipitotemporal cortex houses separate foci for color (within anterior CoS and lingual gyrus) and texture (caudally within posterior CoS). In addition, we found that areas selective for shape, texture, and color individually were quite distinct from those that respond to all of these features together (shape and texture and color). These latter areas appear to correspond to those associated with the perception of complex stimuli such as faces and places.

Citation

Cavina-Pratesi, C., Kentridge, R., Heywood, C., & Milner, A. (2010). Separate channels for processing form, texture, and color: Evidence from fMRI adaptation and visual object agnosia. Cerebral Cortex, 20(10), 2319-2332. https://doi.org/10.1093/cercor/bhp298

Journal Article Type Article
Online Publication Date Jan 25, 2010
Publication Date Oct 1, 2010
Deposit Date Feb 23, 2012
Publicly Available Date Mar 28, 2024
Journal Cerebral Cortex
Print ISSN 1047-3211
Electronic ISSN 1460-2199
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 20
Issue 10
Pages 2319-2332
DOI https://doi.org/10.1093/cercor/bhp298
Keywords Color processing, fMRA, Shape processing, Texture processing, Visual agnosia.

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Copyright Statement
This is a pre-copyedited, author-produced version of an article accepted for publication in Cerebral Cortex following peer review. The version of record Cavina-Pratesi, C., Kentridge, R.W., Heywood, C.A. & Milner, A.D. (2010). Separate channels for processing form, texture, and color: Evidence from fMRI adaptation and visual object agnosia. Cerebral Cortex 20(10): 2319-2332 is available online at: https://doi.org/10.1093/cercor/bhp298.





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