Abstract
10 exceptional children ages 3 to 16 yr. matched-to-sample with either one response (single sample-response condition) or 5 or 10 responses (multiple sample-response condition) requited on the sample to produce the comparison stimuli. Accuracy increased going from the single to the multiple sample-response condition and decreased when the multiple sample-response requirement was changed to a single sample response. Acquisition of the task by two of the subjects was facilitated by the increased sample-response requirement.
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