Visual defects resulting from prestriate cortical lesions in cats.

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Abstract
Cats were tested before and after lesions of the middle suprasylvian gyrus, and compared to nonoperate controls, on thresholds for brightness, size, and form discrimination. The lesions caused (a) essentially no effect on brightness, (b) a moderate and temporary increase in size threshold, and (c) a marked, persistent increase in the form-discrimination threshold. Postoperative learning of umweg problems was also impaired. " . . . prestriate lesions selectively impair visual form discriminations and retard the solution of new visual learning tasks . . . without apparent effect on trans-operative retention." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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