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Compared the sensorimotor skills and play behaviors of 16 normal 16-25 mo old children, 16 mentally retarded children (CA 32-80 mo, MA 17-38 mo), and 16 autistic children (CA 39-74 mo, MA 18-38 mo) to identify deficits in object knowledge specific to autism. There were no differences in sensorimotor
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Sigman et al. (1984) studied this question.
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