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A series of observations, made on several litters of cats, demonstrate the hypothesis that early infantile traumata have lasting effects which can be observed in adult behavior. These experiments illustrated the effects of early separation from the mother on such activities as: reaction to novel situations, goal-directed behavior, recovery from intense stimulation, feeding behavior, and reaction to feeding conflict. The results tended to confirm the thesis that the earlier the separation from the mother, the more pervasive the effects produced in adult behavior.