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4a. Frequency (means +/− SEM) of infants’ lipsmacking in response to mother’s lipsmack (blue) and other females’ lipsmack (red) during the infants’ first two months of life. 4b. Frequency (means +/− SEM) of infants’ lipsmacking directed at the mother (blue) or other females (red) without prior lipsmacking by adult monkeys during the infants’ first two months of life.
