Robert H. MacTurk, Peter M. Vietze, Mary E. McCarthy, Susan McQuiston, Leon J. Yarrow, The Organization of Exploratory Behavior in Down Syndrome and Nondelayed Infants, Child Development, Vol. 56, No. 3 (Jun., 1985), pp. 573-581
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MacTurk et al. (1985) studied this question.
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