Unified histogram for the population of hue-selective voxels in human visual cortex

Abstract

We have reported the population histograms of the hue selective voxels in human visual cortex, measured using functional magnetic resonance imaging (fMRI) [1]. Each histogram was obtained by investigating blood-oxygenation level dependent (BOLD) signal time course during continuous changes in stimulus hue under isoluminance, and the most selective hue of each voxel was estimated [1]. Unexpectedly, red-green selective voxels scarcely appear together with blue-yellow selective voxels in a histogram when various radius ratios (RR) between the two opponent color axes for the elliptic hue locus were tested. In an attempt of unifying the histograms, differences in hue sampling density was compensated before averaging across all RR conditions. The combined histogram exhibited relatively uniform distributions, and it lends support to our hypothesis that the population of hue-selective neurons is likely more isotropic and anisotropy [1] may be a small fluctuation atop a uniform distribution.

Meeting abstract presented at the 2016 OSA Fall Vision Meeting

Footnotes

 This study was supported by JSPS KAKENHI Grant numbers JP20300114 and JP25242079 to KC and JP24330205 and JP15H03460 to IK.