Three experiments are reported investigating the relationship between response recall and the spacing of repetitions as a function of the retention interval. The results of the experiments support the theory which emphasizes the nature of the cues available for retrieval. (Author/RM)

Two experiments tested what happens to learning performance as serial location of a word list is removed as a consistent source of associations across trials. Serial recall produced a stable level of performance and little learning. Serial recall learning may require certain memory factors in combination. (CHK)