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  • Title: Conditional versus trial-unique delayed matching-to-sample.
    Author: Williams DC, Dube WV, Johnston MD, Saunders KJ.
    Journal: Am J Ment Retard; 1998 Sep; 103(2):186-92. PubMed ID: 9779285.
    Abstract:
    We compared performance on conditional and trial-unique delayed identity matching-to-sample procedures. In Experiment 1, participants with moderate to severe mental retardation were exposed to both procedures under a single, brief delay value. Three of 5 subjects showed higher accuracy in the trial-unique sessions. In Experiment 2, participants with mild mental retardation were exposed to delay values of 0, 2, 4, 8, and 16 seconds, randomized within each session. For 3 of 4 subjects, accuracy was highest with trial-unique, and lowest on the conditional matching-to-sample, at longer delays. Across the two studies, 6 of 9 subjects showed lower delayed matching accuracy when fewer rather than more stimuli were included in a session.
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