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Representation of color stimuli in awake macaque primary visual cortex.
Wachtler T, Sejnowski TJ, Albright TD.
Center for Theoretical Neurobiology and Howard Hughes Medical Intitute,
The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
We investigated the responses
of single neurons in primary visual cortex (area V1) of awake monkeys
to chromatic stimuli. Chromatic tuning properties, determined for
homogeneous color patches presented on a neutral gray background,
varied strongly between cells. The continuum of preferred
chromaticities and tuning widths indicated a distributed representation
of color signals in V1. When stimuli were presented on colored
backgrounds, chromatic tuning was different in most neurons, and the
changes in tuning were consistent with some degree of sensitivity of
the neurons to the chromatic contrast between stimulus and background.
Quantitatively, the average response changes matched the magnitudes of
color induction effects measured in human subjects under corresponding
PMID: 12597864 [PubMed - indexed for MEDLINE]