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Journal of Neuroscience, Vol 10, 649-669, Copyright © 1990 by Society for Neuroscience
Chromatic mechanisms in striate cortex of macaque
P Lennie, J Krauskopf and G Sclar
Department of Psychology, University of Rochester, New York 14627.
We measured the responses of 305 neurons in striate cortex to moving
sinusoidal gratings modulated in chromaticity and luminance about a fixed
white point. Stimuli were represented in a 3-dimensional color space
defined by 2 chromatic axes and a third along which luminance varied. With
rare exceptions the chromatic properties of cortical neurons were well
described by a linear model in which the response of a cell is proportional
to the sum (for complex cells, the rectified sum) of the signals from the 3
classes of cones. For each cell there is a vector passing through the white
point along which modulation gives rise to a maximal response. The
elevation (theta m) and azimuth (phi m) of this vector fully describe the
chromatic properties of the cell. The linear model also describes neurons
in l.g.n. (Derrington et al., 1984), so most neurons in striate cortex have
the same chromatic selectivity as do neurons in l.g.n. However, the
distributions of preferred vectors differed in cortex and l.g.n.: Most
cortical neurons preferred modulation along vectors lying close to the
achromatic axis and those showing overt chromatic opponency did not fall
into the clearly defined chromatic groups seen in l.g.n. The neurons most
responsive to chromatic modulation (found mainly in layers IVA, IVC beta,
and VI) had poor orientation selectivity, and responded to chromatic
modulation of a spatially uniform field at least as well as they did to any
grating. We encountered neurons with band-pass spatial selectivity for
chromatically modulated stimuli in layers II/III and VI. Most had complex
receptive fields. Neurons in layer II/III did not fall into distinct groups
according to their chromatic sensitivities, and the chromatic properties of
neurons known to lie within regions rich in cytochrome oxidase appeared no
different from those of neurons in the interstices. Six neurons, all of
which resembled simple cells, showed unusually sharp chromatic selectivity.
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