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Science 12 January 1990:
Vol. 247. no. 4939, pp. 214 - 217
DOI: 10.1126/science.2294602
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Articles

Science, Vol 247, Issue 4939, 214-217
Copyright © 1990 by American Association for the Advancement of Science

articles

Perceptual deficits and the activity of the color-opponent and broad-band pathways at isoluminance

NK Logothetis, PH Schiller, ER Charles, and AC Hurlbert

Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139.

The deficits in texture, motion, and depth perception incurred in monkeys at isoluminance were compared with the responses of neurons of the color-opponent and broad-band systems in the lateral geniculate nucleus. Texture perception, assumed to be carried by the color-opponent system, and motion and depth perception, ascribed to the broad-band pathway, were all found to be compromised but not abolished at isoluminance. Correspondingly, both the color-opponent and the broad-band systems were affected at isoluminance, but the activity of the neurons in neither system was abolished. These results suggest that impairment of visual capacities at isoluminance cannot be uniquely attributed to either of these systems and that isoluminant stimuli are inappropriate for the psychophysical isolation of these pathways.


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