Abstract
The variability of color-selective neurons in human visual cortex is considered more diverse than cone-opponent mechanisms. We addressed this issue by deriving histograms of hue-selective voxels measured using fMRI with a novel stimulation paradigm, where the stimulus hue changed continuously. Despite the large between-subject difference in hue-selective histograms, individual voxels exhibited selectivity for intermediate hues, such as purple, cyan, and orange, in addition to those along cone-opponent axes. In order to rule the possibility out that the selectivity for intermediate hues emerged through spatial summation of activities of neurons selectively responding to cone-opponent signals, we further tested hue-selective adaptations in intermediate directions of cone-opponent axes, by measuring responses to 4 diagonal hues during concurrent adaptation to 1 of the 4 hues. The selective and unidirectional reduction in response to the adapted hue lends supports to our argument that cortical neurons respond selectively to intermediate hues.
Original language | English |
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Pages (from-to) | 4869-4884 |
Number of pages | 16 |
Journal | Cerebral Cortex |
Volume | 25 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- Color vision
- Functional MRI
- Hue selectivity
- Human visual cortex
- Population histogram
- fMRI adaptation
ASJC Scopus subject areas
- Cognitive Neuroscience
- Cellular and Molecular Neuroscience