Comparison of the effects of frontal and caudate lesions on discrimination learning in monkeys.

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Abstract
Monkeys with destructions of lateral frontal cortex or of the head of the caudate nucleus were inferior to unoperated controls on an auditory discrimination and two visual discriminations, all presented with the differentiation procedure; frontals appeared to show the greater impairment. When correction trials were excluded from analysis of the auditory learning, there was little difference between the groups in the rate of improvement. It is thought that operated animals have difficulty in overcoming normal response preferences. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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