Conditions Influencing Vocal Responsiveness of Infant Chimpanzees

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Science  13 Jul 1962:
Vol. 137, Issue 3524, pp. 127-128
DOI: 10.1126/science.137.3524.127


Infant chimpanzees were tested to determine the effects on distress vocalizations (whimpering, screaming) of stimulus conditions approximating the physical relationship to the mother. Under such conditions spontaneous vocalizations were infrequent, and vocal responsiveness to a painful stimulus was substantially reduced.