Conducted 2 experiments in which pitch recognition was required after a 4-sec delay during which 4 other tones were played. Ss were 18 and 22 undergraduates in Exp I and II, respectively. When the standard (S) and comparison (C) tones were identical in pitch, the inclusion of a tone in the intervening sequence that was a semitone higher or lower than the S tone produced an increase in errors. Including tones both a semitone higher and a semitone lower in the same intervening sequence produced a further increase in errors. Analogous results were obtained when the S and C tones differed in pitch. However, when the critical intervening tone was identical in pitch to the C tone, errors were further increased. (PsycINFO Database Record (c) 2006 APA, all rights reserved)