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Journal of Neuroscience, Vol 12, 408-424, Copyright © 1992 by Society for Neuroscience
Color selectivity of neurons in the inferior temporal cortex of the awake macaque monkey
H Komatsu, Y Ideura, S Kaji and S Yamane
Neuroscience Section, Electrotechnical Laboratory, Ibaraki, Japan.
We tested the color selectivity of neurons in the inferior temporal (IT)
cortex of two awake macaque monkeys. A color stimulus was presented at the
center of the visual field while the animal performed a fixation task. The
responses of single units to various colors were recorded and were plotted
in a color space. The color space was based on the CIE (Commission
Internationale de l'Eclairage) chromaticity diagram. Quantitative analysis
of the color selectivity was performed using a standard set of colors that
were evenly distributed in the color space. Sixty-five neurons recorded
from eight guide tubes implanted in anterior part of IT cortex were tested
quantitatively, and their color selectivity was statistically evaluated.
Forty-six of them (71%) were classified as color selective. Color-selective
cells responded to some colors but not to others, and we called the
responsive region in the color space the "color field." The location and
the size of a cell's color field were largely independent of the luminance
of the stimulus. About 80% of the color-selective neurons had color fields
consisting of a single responsive region that were restricted in some part
of the color space, and the remaining cells had more than one responsive
region within the color space. Preferred hues of the color-selective
neurons differed from cell to cell. The population of cells together
covered nearly all of the color space. There was a tendency for more
color-selective cells to be less sensitive to white and desaturated cyans.
Some of the cells with color fields that consisted of more than one
responsive region were more sensitive to saturation of the stimulus than to
its hue. Although previous electrophysiological studies in IT cortex
emphasized the pattern selectivity of the neurons, our results suggest that
color is an important factor in the role that IT cortex plays in the object
recognition.
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