2 pigtail monkeys with dorsolateral frontal lesions and 2 control Ss were observed pre- and postoperatively in social and isolation conditions. Behavior was exhaustively classified into 10 discrete categories. In both observation situations the distribution of behavior was consistent over time for controls. In the social observation condition, however, frontals increased slow locomotion and decreased behaviors involving visual stimulation. No changes in behavior patterns were produced by the isolation condition.
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