Abstract
Distances between closest playmates were measured during free play in mentally retarded and normal grade school children. Unobtrusive observation techniques minimized interference and a spacious playground environment was chosen to avoid effects of confining walls on spatial behavior. Younger children (grades 1–3) kept closer distances than older children (grades 4–6), independent of clinical history or sex (p<.0001). Parallels are drawn with findings of previous observational studies in adults and non-human primates; two hypotheses, based on cognitive development and social disturbance, are proposed to explain the findings.
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