Kinnell, A.Dennis, S.2013-03-252013-03-252012Memory and Cognition, 2012; 40(3):311-3250090-502X1532-5946http://hdl.handle.net/2440/76220While many studies have investigated the list length effect in recognition memory, few have done so with stimuli other than words. This article presents the results of four list length experiments that involved word pairs, faces, fractals, and photographs of scenes as the stimuli. A significant list length effect was identified when faces and fractals were the stimuli, but the effect was nonsignificant when the stimuli were word pairs or photographs of scenes. These findings suggest that the intrastimulus similarity is what dictates whether list length has a significant effect on recognition performance. As is the case with words, word pairs and photographs of scenes are not sufficiently similar to generate detectable item interference.en© Psychonomic Society, Inc. 2011RecognitionList length effectJournal article002011878610.3758/s13421-011-0164-20003034517000012-s2.0-8486448619624674