Abstract
Results previously obtained by the method of electrical stimulation indicate that the frontal pole and adjacent cortex of the rat can have an inhibitory influence on the rate of barpressing for food. The effects of bilateral lesions in this cortical area of the rat on the rate of barpressing were investigated. When lesioned rats were hungry, neither their rate of barpressing for food nor their rate of responding during extinction was increased as compared with control rats. When lesioned rats were allowed ad-lib feeding in the home cage, the rate of barpressing for food was also not increased, but the rate of responding during extinction was increased. Stabilimeter activity of these rats was increased when they were hungry, but not when they were allowed ad-lib feeding in the home cage. It is concluded that these frontally lesioned rats displayed a perseveration tendency in their operant behavior, but that this tendency was counteracted by the effects of increased general activity when they were hungry.
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