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  Coding and binding of colour and form in visual cortex

Seymour, K., Clifford, C., Logothetis, N., & Bartels, A. (2010). Coding and binding of colour and form in visual cortex. Cerebral Cortex, 20(8), 1946-1954. doi:10.1093/cercor/bhp265.

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Seymour, K1, Author           
Clifford, CWG2, Author           
Logothetis, NK1, Author           
Bartels, A1, Author           
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              

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 Abstract: The processing of color and form is largely segregated within the visual brain. But there is also evidence to suggest that these features are coded in combination early in visual processing. Here, we combined high-resolution functional magnetic resonance imaging (fMRI) together with multivariate pattern classification to examine where in the visual cortex specific color form "conjunctions" are represented. Human subjects viewed visual displays containing colored spiral patterns. The spiral patterns could be red or green, and oriented either clockwise or counterclockwise, leading to 4 possible stimulus configurations. Two additional displays combined 2 of the above single color-form pairings, leading to double conjunctions. We applied linear classifiers to voxel activation patterns obtained while subjects viewed such displays. Our findings not only show that color and form information is coded across retinotopically defined visual areas, but also that the 2 double-conjunction stimuli can be distinguished. The voxels most informative about conjunctions were distinct from those most informative about color or form alone. Our results indicate that conjunctions of form and color may be coded by separate functional units as early as primary visual cortex. The results of this study have implications for theories concerning the segregation and binding of color and form information.

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 Dates: 2010-08
 Publication Status: Issued
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Title: Cerebral Cortex
Source Genre: Journal
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Pages: - Volume / Issue: 20 (8) Sequence Number: - Start / End Page: 1946 - 1954 Identifier: -