Abstract

Changes in orienting activity induced by lesions of the hippocampus were studied in 15 unrestrained cats. The orienting reflex was elicited by repetitive stimuli either “indifferent” or familiar to the animal. Electrocoagulations were followed by changes in spontaneous behavior of the animal (docility, reduced spontaneous affective manifestations), and by changes of orienting behavior (somatic reactions of small amplitude accompanied by poor vegetative-affective manifestations). The magnitude of behavioral change was a function of extent of lesions. These changes were due to the postlesion alterations of the control function exerted by the hippocampus upon the general behavior.

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