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A group of rats was tested 25 days in an activity cage. On the basis of preoperative activity scores they were divided into a control and 5 experimental groups. Controls were sham-operated and experimentals received bilateral ablation of either anterior, posterior, or medical parts of the cortex. Removal of frontal poles tended to produce considerable increase in activity; level of activity was not affected by other operations. Postoperative emotional changes reported by others were not found. 19 references.

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