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Journal of Neuroscience, Vol 10, 2223-2237, Copyright © 1990 by Society for Neuroscience
Color and contrast sensitivity in the lateral geniculate body and primary visual cortex of the macaque monkey
DH Hubel and MS Livingstone
Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115.
We tested color and contrast sensitivity in the magnocellular and
parvocellular subdivisions of the lateral geniculate body and in layers 2,
3, 4B, and 4C alpha of visual area 1 to obtain physiological data on the
degree of segregation of the 2 pathways and on the fate of the color and
contrast information as it is transmitted from the geniculate to the
cortex. On average, magnocellular geniculate cells were much less
responsive than parvocellular cells to shifts between 2 equiluminant
colors. Nevertheless, many magnocellular cells (though not all) continued
to give some response at equiluminance. As expected from previous studies,
luminance contrast sensitivity differed markedly between magnocellular and
parvocellular layers. In V-1, the properties of cells in the magnorecipient
layers 4C alpha and 4B faithfully reflected the properties of magnocellular
geniculate cells, showing no evidence of any parvocellular input. Like
magnocellular geniculate cells, they showed high contrast sensitivity, and
with color contrast stimuli they showed large response decrements at
equiluminance. In the interblob regions of cortical layers 2 and 3, which
anatomically appear to receive most of their inputs from parvorecipient
layer 4C beta, contrast sensitivities of some of the cells were compatible
with a predominantly parvocellular input. Other interblob cells had
sensitivities intermediate between magno- and parvocellular geniculate
cells, suggesting a possible contribution from the magnocellular system.
Many cells in cortical layers 2 and 3 responded to color- contrast borders
equally well at all relative brightnesses of the 2 colors, including
equiluminance. We recorded from many direction- and disparity-selective
cells in V-1: most of the direction-selective and all of the clearly
stereo-selective cells were located in layer 4B.
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