Abstract
Two experiments examined the effects of repetition on the short-term retention of order information. A partial report procedure was coupled with the distractor paradigm to vary which one of two 4-letter sequences was tested after a digit-filled retention interval. Repeatedly presenting the stimulus but not its testing did not increase recall, but recall did increase when both presentation and testing were repeated. Recall was also improved by precues that informed subjects in advance which sequence was to be recalled. The perturbation model of Estes (1972; Lee & Estes, 1981) was able to account for the qualitative and quantitative aspects of the results by making an explicit distinction between two types of rehearsal: the reactivation process, which corresponds to a passive, automatic rehearsal process; and an active, conscious rehearsal process that crystallizes the memory structure and makes perturbations less likely.
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