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J Neurophysiol 87: 3138-3151, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 87 No. 6 June 2002, pp. 3138-3151
Copyright ©2002 by the American Physiological Society

Color Processing in Macaque Striate Cortex: Electrophysiological Properties

Carole E. Landisman and Daniel Y. Ts'O

The Rockefeller University, New York, New York 10021 and Baylor College of Medicine, Houston, Texas 77030

Landisman, Carole E. and Daniel Y. Ts'O. Color Processing in Macaque Striate Cortex: Electrophysiological Properties. J. Neurophysiol. 87: 3138-3151, 2002. We have shown in the accompanying paper that optical imaging of macaque striate cortex reveals patches that are preferentially activated by equiluminant chromatic gratings compared with luminance gratings. These imaged color patches are highly correlated, although not always in one-to-one correspondence, with the cytochrome-oxidase (CO) blobs. In the present study, we have investigated the electrophysiological properties of neurons in the imaged color patches and the CO blobs. Our results indicate that individual blobs tend to contain cells of only one type of color opponency: either red/green or blue/yellow. Individual imaged color patches, however, can bridge blobs of similar opponency or differing opponency. When imaged color patches contain two blobs of differing opponency, the cells in the bridge region exhibit mixed color properties that are not opponent along the two cardinal color axes (either red/green or blue/yellow). Two blobs within a single imaged color patch receive input from the same eye or from different eyes. In the latter case, the bridge region between blobs contains binocular cells that are color selective. Because the cells recorded in imaged color patches were more color selective and unoriented than cells outside of color patches, color properties appear to be organized in a clustered and segregated fashion in primate V1.




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