Using between subject designs, Tversky and Sherman (1975) and Weaver (1974) demonstrated that increases in the blank interval (offtime) separating two successive pictures leads to improved performance on retention tests. If this improvement results from active rehearsal strategies, subjects should be able to differentially rehearse pictures cued as more valuable, and this differential rehearsal should be more effective with longer off-times. This question was investigated in a 2 x 2 design where a tone at offset was used to cue valuable pictures (within subjects) at two ISI values (across subjects). The main effects of both off-time and tone were significant, but there was no tone X off-time interaction. These results do not support the active rehearsal hypothesis. Alternative hypotheses are discussed. (Author)