The purpose of the present study was to examine the relationship between the number of rehearsals and long-term recall performance by means of an overt rehearsal procedure. Subjects were induced to concentrate their rehearsal activity on specific items in free recall tasks. In Experiment 1, both the primacy and the recency items that had received additional rehearsals were recalled with higher probability than were the ordinarily rehearsed items in immediate recall but not in final recall. Experiment 2 was designed to extend the occasions for subjects' rehearsal by manipulating the rate ofitem presentation. The overall pattern of resulting data showed that for neither recency items nor primacy items does the additional overt rehearsal reliably lead to facilitative effects on long-term recall performance. The possibility of a qualitative change in rehearsal is discussed.The multistore model of human memory, which postulates that there are several memory-storage systems, such as short-term and long-term stores, is based mainly on analyses of serial position curves resulting from free recall tasks (Atkinson & Shiffrin, 1968, 1971). AU-shaped serial position curve in immediate free recall is consistently obtained, and according to this model, the high recall probability of the first few items (primacy effect) and of the last few items (recency effect) reflects output from the long-term and short-term stores, respectively. Presumably, the nearer to the beginning of a list an item is, the more frequently it will be rehearsed. It has been suggested that this can account for the so-called primacy effect, since in this model it is assumed that the probability of information transfer to long-term storage increases with rehearsal frequency of an item. This possibility was supported by experimental data from Rundus and Atkinson (1970) and Rundus (1971), who examined the relationship between free recall performance and the number of rehearsals by means of an overt rehearsal procedure. The subjects were instructed to study a word list by repeating items aloud during presentation, and their overt rehearsals were taperecorded. The resulting free recall performance showed a typical U-shaped curve, in which the mean number of rehearsals was highest for the beginning items and gradually decreased with items' serial positions. Hence, for prerecency items the number of rehearsals correlated highly with the probability of recall.Further support for the role of rehearsal in long-term storage came from Craik (1970), who gave an unexpectedThe author is greatly indebted to Associate Professor Ryozo Yukawa of Osaka City University for his advice and guidance. Requests for reprints should be sent to Hiroyulci Shimizu at Department of Psychology. Faculty of Letters, Osaka City University. Sumiyoshi-lru. Osaka 558. Japan.final free recall test on all items from a previous series of immediately recalled lists. In contrast with the immediate recall tests, in final recall, recency items were found to be recalled most poorly (subsequently dubbed...