Discriminative choice in normal and prefrontal rhesus monkeys.

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Abstract
Performance of 2-choise, simultaneous discrimination problems was analyzed for normal rhesus monkeys and for those with bilateral lesions of the dorsolateral frontal granular cortex. The rewarded, the nonrewarded or both discriminanda were kept constant or were varied frequently. The Ss could achieve and maintain successful performance as long as 1 discriminandum of a pair remained the same in its stimulus characteristics and in its association with a particular kind of outcome. Frontal monkeys were relatively impaired whenever the solution demanded that they abandon reacting to a nonrewarded discriminandum. No abnormally strong tendency to choose novel stimulus objects was present in either group under the conditions of this study.

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