Contrast adaptation in striate cortex of macaque.
We have characterized the contrast-response relationships for simple and complex cells in striate cortex of macaque monkey, before and during adaptation to high-contrast sinusoidal gratings of the optimal spatial-frequency and orientation. Adaptation brings about systematic changes in the steepness of contrast-response curves and in the effective contrast of stimuli. Adaptation reduces the detectability of low-contrast gratings by almost a factor of three, but by extending the operating range of most cells it appears to improve the discriminability of high-contrast stimuli that previously gave rise to responses of saturating amplitude.
Sclar
G
G
Department of Psychology, University of Rochester, NY 14627.
Lennie
P
P
DePriest
D D
DD
D000221:Adaptation, Ocular / Q000502:physiology*; D000818:Animals; D015350:Contrast Sensitivity / Q000502:physiology*; D008252:Macaca fascicularis; D009474:Neurons / Q000502:physiology; D010364:Pattern Recognition, Visual; D014793:Visual Cortex / Q000166:cytology / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology