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Cerebral Cortex Advance Access published online on February 8, 2006
Cerebral Cortex, doi:10.1093/cercor/bhj131
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Article

V2 Thin Stripes Contain Spatially Organized Representations of Achromatic Luminance Change

Yi Wang 1, Youping Xiao 2, and Daniel J. Felleman 3 *

1 Department of Neurobiology and Anatomy, University of Texas Medical School-Houston, Houston, TX 77030, USA; Current address: Institute of Biophysics, Chinese Academy of Science, Beijing 100101, PR China
2 Department of Neurobiology and Anatomy, University of Texas Medical School-Houston, Houston, TX 77030, USA; Current address: Department of Neuroscience, Mount Sinai School of Medicine, New York, NY, USA
3 Department of Neurobiology and Anatomy, University of Texas Medical School-Houston, Houston, TX 77030, USA

* To whom correspondence should be addressed.
Daniel J. Felleman, E-mail: daniel.felleman{at}uth.tmc.edu


  Abstract

A considerable amount of research over the last decades has focused on the apparent specialization of V2 thin stripes for the processing of color in diurnal primates. However, because V2 thin stripes are functionally heterogeneous in that they consist of largely separate color- and luminance-preferring domains and because the color-preferring domains contain a systematic representation of hue, we hypothesized that they contained functional maps that subserve luminance processing. Here we show, using optical imaging of intrinsic cortical signals and microelectrode recording, that the V2 thin stripe luminance-preferring domains contain spatially segregated modules that encode the direction of relative luminance change. Quantitative analysis of the cortical responses to luminance increments or decrements indicates that these luminance-sensitive modules also encode the magnitude of the luminance change by the magnitude of the evoked cortical response. These results demonstrate an important role of V2 thin stripes in the processing of luminance and thus suggest that thin stripes are involved in the overall processing of the surface properties of objects rather than simply the processing of color.

Keywords: cytochrome oxidase stripes; functional imaging; luminance coding; macaque monkey; optical recording; visual cortex.
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