Ss were required to keep track of the number of occurrences of each of three pure tones presented at a constant rate in sequences (trials) of various lengths. With trial lengths of 8 and 12 tones, as practice progressed the shorter the stimulus exposure duration, the better the performance. This effect was not obtained with trial lengths of 16 and 20 tones. White noise presented during interstimulus intervals did not affect performance. Implications for a model of keeping-track behavior are examined.
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