For each 3-digit number in a protracted sequence of such numbers, Ss responded "old" or "new" depending on whether they did or did not remember having seen that number at an earlier point in the sequence. Each number was presented twice; but the number of other 3-digit numbers intervening between the 1st and 2nd presentation of the same number was manipulated as the independent variable. A trace model yielded theoretical curves that were a close fit to the data obtained. "The fitted curves also made possible the estimation of a lower bound on the amount of information that Ss are able to carry along at any one time during an arbitrarily protracted sequence of three-digit numbers." (28 ref.) From Psyc Abstracts 36:04:4CL02S. (PsycINFO Database Record (c) 2006 APA, all rights reserved)