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Jones, Sandra J.; Moss, Howard A. – Child Development, 1971
The relation between maternal presence and infant's vocalization depended upon the infant's state: when the infant was in the active awake state, he vocalized less in the presence of the mother than when alone, thus indicating that the majority of early vocalizations are associated with a non-social situation. (Authors/RY)
Descriptors: Behavioral Science Research, Correlation, Data Analysis, Environmental Influences