“…In a number of previous studies, 5"s were required to tally mentally the number of occurrences of each of several different stimuli presented visually in sequences of varying length and to report their running mental tallies at the end of each sequence. In keeping-track tasks of this nature it has been found that memory processes, especially encoding and rehearsal strategies, are a major determinent of performance (Monty, 1968;Monty, Fisher, &Karsh, 1967;Taub, Monty, &Laughery, 1967).…”