Inferior temporal lesions do not impair discrimination of rotated patterns in monkeys

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Ablation of inferior temporal cortex in the rhesus monkey produces a visual discrimination learning deficit. The severity of this deficit has often been found to be a function of task difficulty. The present paper reports 2 experiments with 25 Macaca mulatta and M. fascicularis on a type of visual discrimination problem that, although difficult, is not sensitive to inferior temporal lesions. Ss with anterior, posterior, and complete inferior temporal lesions were repeatedly unimpaired or only slightly impaired in learning to discriminate a pattern from the same pattern rotated 90| or 180|; yet they were very severely impaired in learning equally or more difficult discriminations of 2 different patterns. This demonstration that discrimination of orientation of patterns is relatively spared after inferior temporal lesions helps specify the pattern-rcognition processes that require inferior temporal cortex. (16 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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