The present study investigated how to improve responses to the question, "How many objects are there?", by a boy (CA 9 years 10 months) with moderate mental retardation. The child's errors included incorrect counting of the objects, and giving the response "6" to that question, even when "6" was an incorrect answer. Because the child occasionally counted correctly, differential reinforcement was employed to improve the accuracy of his counting. The boy's own stereotyped answers were used to decrease the stereotyped, incorrect response of "6". When the child answered "6", the trainer presented a card with "6" written on it. The results showed that the child's counting skills improved, mainly as a result of differential reinforcement. Applying positive reinforcement for giving correct answers about how many objects there were did not modify the stereotyped "6" response. However, when the child counted to 6 and the trainer presented a card with "6" on it, the stereotyped answers were slightly modified, suggesting that the coincidence between the number of objects counted and the number on the card had resulted in control over the response. After that, a delayed prompting procedure was added, and was successful in improving the correctness of the boy's answers.
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