Effects of inferior temporal lesions on visual discrimination performance in monkeys with complete and incomplete striate cortex ablations

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Eight male cynomolgus monkeys (Macaca fascicularis) were retrained to perform 2 preoperatively acquired discriminations (brightness-flux and brightness-area) after receiving bilateral striate cortex lesions to determine whether the inferior temporal cortex participates in the relearning of visual discriminations following striatectomy. Ss were then retested in the same tasks after bilateral inferior temporal surgery. After inferior temporal surgery, Ss with histologically verified total ablation of the striate cortex showed little or no impairment in relearning the discriminations, whereas Ss with remnants of intact striate cortex were severely impaired. Findings suggest that the inferior temporal cortex is of minor importance in relearning brightness-flux and brightness-area discriminations in the absence of striate cortex. This interpretation is consistent with the view that the contribution of the inferior temporal cortex to visual discrimination performance depends on input from striate cortex. (31 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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