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Science 4 July 1969:
Vol. 165. no. 3888, pp. 69 - 71
DOI: 10.1126/science.165.3888.69
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Articles

Uncus and Amiygdala Lesions: Effects on Social Behavior in the Free-Ranging Rhesus Monkey

Dennis Dicks 1, Ronald E. Myers 1, and Arthur Kling 1

1 Department of Psychiatry, University of Illinois College of Medicine, Chicago, and National Institute of Neurological Diseases and Stroke, San Juan, Puerto Rico

The eflect of uncinectomny on the social behavior of free-ranging rhesus monkeys was observed on Cayo Santiago Island. Operated subjects showed social indifjerence, failed to display appropriate aggressive and submissive gestures. were expelled from their social group, and evenitlually died. Two juvenile subjects with the lesion restricted to amygdala survived and have rejoinied their social group. Size of lesion and age at operation were major factors in determniting the degree of behavioral change.


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