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The discriminative performance of students was assessed on a delayed-matching-to-sample task (DMST) using disks, presented by a computer, as stimuli. The size of the non-matching comparison stimuli was changed, for each participant, until each was 100% correct at 0.05 s delay. Then delays of 0.05, 2, 4, 8 and 16 s were paired with each of one, four, eight, 16, and 32 sample stimuli. Accuracy generally...