Abstract
12 rhesus monkeys[long dash]6 normal animals and 6 which had been subjected to bilateral prefrontal lobectomy[long dash]were tested on spatial delayed reactions, using a direct method. The performance of 2 of the operated subjects was comparable to that of the normal monkeys; these subjects solved delayed reaction of at least 20 sec. duration. The other 4 operated animals adapted poorly to the delayed reaction tests and gave little evidence of solving the problems. Analyses of the data indicated that monkeys, following destruction of the prefrontal association areas, suffer deficit in attending and fixating limited aspects of a test situation, and that this deficit underlies the impairment found in delayed reaction tests.

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