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  • Title: Effects of imitation training on immediate and delayed imitation by severely retarded children.
    Author: Hekkema N, Freedman PE.
    Journal: Am J Ment Defic; 1978 Sep; 83(2):129-34. PubMed ID: 696761.
    Abstract:
    Contingent reinforcement was used in training eight severely retarded children who were previously judged to be nonimitative. A yoked control group was given comparable training, but with noncontingent reinforcement. Posttests of imitation of new behavior of a reinforced model showed significant immediate and delayed (15 minutes) imitation only in the contingent-reinforcement group.
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