Abstract
Electrical activity was recorded from various cortical and subcortical loci in monkeys during the learning of visual pattern discriminations. Potentials evoked by the discriminative stimuli were found to change during learning in the striate and prestriate cortex, the lateral geniculate body and the inferior pulvinar. No changes were evident in the medial pulvinar, midbrain reticular formation or hippocampus. In the inferior pulvinar and prestriate cortex the greatest changes were evident during the acquisition of the discrimination, while in the lateral geniculate nucleus and striate cortex the most marked changes were observed following attainment of criterion performance. These results are interpreted as showing a functional differentiation of the pulvinar-prestriate system from the geniculostriate system, and suggest that the inferior pulvinar is involved in the acquisition of visual pattern discriminations.
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