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Cerebral Cortex Advance Access published online on May 28, 2009
Cerebral Cortex, doi:10.1093/cercor/bhp111
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Separate Processing of Texture and Form in the Ventral Stream: Evidence from fMRI and Visual Agnosia

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

Department of Psychology, Durham University, Durham DH1 3LE, UK

Address correspondence to Dr C. Cavina-Pratesi, Department of Psychology, Science Laboratories, Durham University, South Road, Durham DH1 3LE, UK. Email: cristiana.cavina-pratesi{at}durham.ac.uk.

Real-life visual object recognition requires the processing of more than just geometric (shape, size, and orientation) properties. Surface properties such as color and texture are equally important, particularly for providing information about the material properties of objects. Recent neuroimaging research suggests that geometric and surface properties are dealt with separately within the lateral occipital cortex (LOC) and the collateral sulcus (CoS), respectively. Here we compared objects that differed either in aspect ratio or in surface texture only, keeping all other visual properties constant. Results on brain-intact participants confirmed that surface texture activates an area in the posterior CoS, quite distinct from the area activated by shape within LOC. We also tested 2 patients with visual object agnosia, one of whom (DF) performed well on the texture task but at chance on the shape task, whereas the other (MS) showed the converse pattern. This behavioral double dissociation was matched by a parallel neuroimaging dissociation, with activation in CoS but not LOC in patient DF and activation in LOC but not CoS in patient MS. These data provide presumptive evidence that the areas respectively activated by shape and texture play a causally necessary role in the perceptual discrimination of these features.

Key Words: fMRI • humans • shape discrimination • texture discrimination • visual agnosia


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