Required 18 female undergraduates to memorize a list of 30 words (LT set) before participating in a recognition memory task. Test sessions were divided into pure and mixed trial blocks. During pure blocks, 1-4 words (ST set) were presented to S on each trial immediately before exposure of the test stimulus. The S made a positive response if the test stimulus was from the ST set and a negative response if it was a distractor. During mixed blocks the procedure was similar except that test stimuli were also drawn from the LT set; the S made a positive response if the test stimulus was from either the ST set or the LT set, and a negative response otherwise. Results indicate that in the mixed blocks reaction time to positive test stimuli from the LT set or to negative test stimuli did not depend on ST set size; for all other test stimuli, reaction time was an increasing function of ST set size. Findings are consistent with the view that Ss can search a long-term store and a short-term store simultaneously. (PsycINFO Database Record (c) 2006 APA, all rights reserved)