Abstract
The social responses of isolate-reared and control adult males were compared in a situation where each subject was allowed visual and auditory contact but no physical contact with two different stimulus animals. The isolates displayed significantly more selfdirected hostility and significantly more masturbation than did controls. Isolates did not habituate or adapt to the presence of an adult stimulus animal as readily as did the controls. A juvenile stimulus animal vocalized significantly more frequently in the presence of an isolate than she did in the presence of a control male. Visual (facial, postural) and auditory (vocal) communication in adult isolate-reared monkeys is abnormal even when no physical contact is permitted between the isolate and another animal.
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