Discrimination reversal after lateral frontal lesions in monkeys

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Monkeys impaired on delayed response following midlateral frontal lesions, control operatees, and unoperated Ss were tested on 2 discrimination reversals. In Experiment 1 Ss were repeatedly tested for reversal of a discrimination within a session and retention of the same discrimination over 24 hr. Each reversal phase and each retention phase consisted of 30 trials. The frontal operatees made more errors than the other Ss in the reversal phases but not in the retention phases. In Experiment 2 Ss were trained to reverse a previously well-established visual habit. The groups overlapped on this task; each required a mean of over 100 trials to reach criterion. The results suggest that midlateral frontal lesions produce a discrimination deficit that is inversely related to the number of trials per problem. (16 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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