THE SPERLING PROCEDURE OF PARTIAL REPORT WAS USED WITH TACHISTOSCOPICALLY PRESENTED DIGIT SLIDES OF 50-MSEC DURATION. 1 SLIDE WAS REPEATED 54 TIMES WITH A DIGIT SLIDE OF A NONREPEAT SERIES INTERPOLATED BETWEEN REPETITIONS. NO CUMULATIVE EFFECT IN TERMS OF PERCENTAGE OF RECALL WAS OBTAINED. A 2ND EXPERIMENT USING INTERPOLATED LETTER SLIDES REPLICATED THIS OBSERVATION. AN INTERPRETATION IN TERMS OF THE LACK OF A STRUCTURAL CHANGE WITH REPETITION OF A NONENCODED STIMULUS WAS OFFERED. (PsycINFO Database Record (c) 2006 APA, all rights reserved)