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The effect of experimenter absence and response delay on nonreinforced imitation.

Summary Present research attempted to demonstrate the effect of response delay and the presence or absence of the experimenter on the performance of nonreinforced imitative behaviors in retarded children. A multiple baseline design, counterbalanced for conditions, was used. The results indicated that the degree of control exercised by the experimenter's presence or absence was partially determined by the response delay. Other variables that may have affected the imitative performance were (a) other nonimitative behaivors displayed by the subject(s); (b) additional stimuli generated by the experimenter; and (c) the subject's pre-experimental history with the experimenter.