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  • Title: Developmental vs. difference theories of mental retardation: a new look.
    Author: Kamhi AG.
    Journal: Am J Ment Defic; 1981 Jul; 86(1):1-7. PubMed ID: 7270583.
    Abstract:
    Performance of three groups of children (retarded, nonretarded, and language-impaired) on nonlinguistic symbolic and conceptual cognitive tasks was measured. The performance of the retarded and nonretarded groups was essentially similar, while both of these groups generally performed at higher stage levels than did the language-impaired group. Several testable implications were suggested.
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