Affective responses of an infant chimpanzee reared in isolation from its kind.

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Abstract
An infant chimpanzee, reared in isolation from other animals, was presented with a variety of stimulus objects in a food-approach situation. When 7 mos. of age, the subject showed affective disturbance to moving objects only, most of this disturbance being identified as avoidance, and a small portion of it as aggression. When tested again at 15 mos., the subject showed no differentiation on the basis of movement; exhibited more intense disturbance, extended it to a larger range of objects; and exhibited much more aggression. In both tests, those objects which elicited greatest aggression ranked intermediate in respect to capacity to elicit avoidance responses. The performance of the subject was compared with that of other, socialized chimpanzees in a comparable situation.

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