Further studies of the striate and extrastriate visual cortex in the tree shrew.

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Abstract
Trained 9 tree shrews (3 normal, 3 with striate cortex lesions, and 3 with temporal cortex lesions) to choose between 2 stimuli on the basis of orientation of stripes. The stimuli also differed in hue. When Ss reached criterion, hue became the relevant dimension, and shifts between orientation and hue continued. Normal Ss learned the original task and showed evidence of a learning set. Ss with temporal lesions were retarded in initial learning and reverted to chance level with each shift. Ss with striate lesions failed to master the initial problem. The temporal group was also impaired on daily intradimensional reversals. Results are interpreted as evidence for complementary functions of the 2 areas. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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