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40 infants, divided into 10 evenly spaced age groups between the ages of 7.5 and 21 mo, were observed playing with 2 sets of toys in their own homes for up to 30 min. Narrative records of Ss' behavior were coded in terms of a 12-step sequence of play development. Analysis of individual performance i
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Belsky et al. (1981) studied this question.
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