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Effects of reinforced directed rehearsal on expressive sign language learning by persons with mental retardation

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Abstract

This study used a multielement design to compare standard training (prompting and reinforcement) with and without reinforced directed rehearsal as a correction procedure in teaching expressive sign language to 10 nonverbal students with moderate to severe mental retardation. Standard training consisted of either sequential prompting or graduated guidance and 5 students were randomly assigned to each condition. Directed rehearsal involved 10 practices of the correct sign contingent on an error or no response; praise was given during directed rehearsal for cooperation and attempted signing. A stimulus control analysis revealed that only 6 of the 10 students (3 from each standard training condition) completely discriminated the trained signs within the maximum training period of 160 trials (3 of the 4 students who failed the stimulus control test were hearing impaired; the remaining 6 who showed stimulus control were not). Using only these six students' data, we found that directed rehearsal increased: (a) accuracy (percent correct), (b) speed of learning (required fewer trials to criterion), (c) efficiency (decreased total instruction time), and (d) generalization (across trainers, objects, and settings). There were no obvious interactions between directed rehearsal and the type of prompting strategy employed. Very little agitated behavior occurred in any of the sessions, and a treatment acceptability survey indicated that 10 of 14 direct-care staff and the trainers in this study preferred corrective directed rehearsal (as used in this study) over standard training alone. The results indicate that directed rehearsal may be a valuable adjunct to sign language training with nonverbal students with mental retardation.

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Dalrymple, A.J., Feldman, M.A. Effects of reinforced directed rehearsal on expressive sign language learning by persons with mental retardation. J Behav Educ 2, 1–16 (1992). https://doi.org/10.1007/BF00947134

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