The interrelationships among three categories of objective measures of activity were investigated: (a) motor activity, (b) ambulatory activity, and (c) investigatory activity. Activities were assessed during a standardized free-play situation. A factor analysis of the activity measures yielded no unitary dimension of activity but rather multidimensional or specific components of activity. The results supported the theoretical position that activity should be viewed not as homogeneous but as a differentiated construct.
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