Document Detail

V2 thin stripes contain spatially organized representations of achromatic luminance change.
MedLine Citation:
PMID:  16467565     Owner:  NLM     Status:  MEDLINE    
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.
Yi Wang; Youping Xiao; Daniel J Felleman
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2006-02-08
Journal Detail:
Title:  Cerebral cortex (New York, N.Y. : 1991)     Volume:  17     ISSN:  1047-3211     ISO Abbreviation:  Cereb. Cortex     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2006-12-12     Completed Date:  2007-01-23     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  9110718     Medline TA:  Cereb Cortex     Country:  United States    
Other Details:
Languages:  eng     Pagination:  116-29     Citation Subset:  IM    
Department of Neurobiology and Anatomy, University of Texas Medical School-Houston, Houston, TX 77030, USA.
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MeSH Terms
Brain Mapping
Cytochromes c / metabolism
Evoked Potentials / physiology
Macaca fascicularis
Neurons / physiology
Photic Stimulation
Visual Cortex / cytology,  physiology*
Visual Perception / physiology*
Grant Support
Reg. No./Substance:
9007-43-6/Cytochromes c

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