1. In a situation of visually controlled behavior a lesion of the projection area of the forelimb in the sensomotor cortex and total extirpation of the parietal cortex leads to a reduction in the number of correct test performances, lengthening of the searching time, and the change in the character of searching. 2. Partial injury to the parietal association cortex does not affect the number of correct test performances, and this is also true of removal of the frontal pole. In both cases changes in the character of searching and lengthening of the time required to achieve a position of the stimuli rewarded by reinforcement are observed. 3. Extirpation of the striate cortex has no effect on the ability of the animal to learn how to perform the test and causes no change in the strategy of searching.
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