Analysis of the effects of frontal lesions in monkey: II. Variations of delayed response.

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Abstract
Four monkeys (Macaca mulatta) with anterior frontal lesions performed as well as 4 control operates on delayed-response tasks whenever nonpositional pre-delay cues were substituted for the traditional pre-delay cues. The impairment of frontal operates may be on traditional delayed-response tasks therefore related not only to the delay, but to some aspect of the pre-delay cue as well.