Conditional versus trial-unique delayed matching-to-sample.
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.
University of Kansas, Parsons Research Center 67357, USA. williams@parsons.lsi.ukans.edu
D C
DC
Williams
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Dube
M D
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Johnston
K J
KJ
Saunders
D000293:Adolescent; D000328:Adult; D002648:Child; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology*; D008570:Memory, Short-Term; D009483:Neuropsychological Tests