Abstract
Nine Scottish terriers reared in a restricted environment from 4 wks. to 8 mos. of age were compared with normally-reared littermates for responses to seven innocuous but emotion-provoking objects. The sequence in appearance of emotional responses was: (1) diffuse excitement, (2) avoidance and (3) aggression. It appears that well-organized experience of the environment in which emotion-provoking objects will appear is necessary for the emergence of adaptive emotional behavior such as avoidance and aggression.
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