Leila Beckwith, Sarale E. Cohen, Claire B. Kopp, Arthur H. Parmelee, Toni G. Marcy, Caregiver-Infant Interaction and Early Cognitive Development in Preterm Infants, Child Development, Vol. 47, No. 3 (Sep., 1976), pp. 579-587
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Beckwith et al. (1976) studied this question.
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