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The majority of research with children has been in the preschool and infant school age range. Preschool children of 3 to 5 years of age have been the principal subjects of investigation in areas of research such as types of play, deficits in play, training, and the effects of toys and the physical environment on Children were observed, and later asked whether the activities they engaged in were play or work. However few details were presented, and it seems unlikely that children cannot conceive of adults playing with them, even if the teachers in these kindergartens did not do so in a way that the children thought of as play. At a more detailed level, intrinsic motivation does not seem to distinguish from other activities in a reliable fashion, so far as young children are concerned. Rough-and-tumble was neglected until interest was revived by primate and child ethologists.
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Smith et al. (1985) studied this question.
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