Journal
CEREBRAL CORTEX
Volume 17, Issue 1, Pages 116-129Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhj131
Keywords
cytochrome oxidase stripes; functional imaging; luminance coding; macaque monkey; optical recording; visual cortex
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Funding
- NATIONAL EYE INSTITUTE [R01EY008372] Funding Source: NIH RePORTER
- NEI NIH HHS [EY-R01-08372] Funding Source: Medline
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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-pref erring 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-pref erring 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.
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