To assess the effect of stimulus duration and interstimulus interval on memory for pictures, an experiment was performed. Subjects were instructed to memorize a list of 24 line drawings of familiar objects to be recalled. The facilitative effect on recall memory for pictures was obtained when given a longer (5-sec.) rather than a shorter (1-sec.) stimulus duration, with interstimulus interval held constant 1 sec. There was facilitative effect on recall memory for pictures when interstimulus interval was increased from 1 to 5 sec. if stimulus duration was 1 sec. When two groups were given the same total time (6 sec. for stimulus duration plus interstimulus interval), the group given the longer (5-sec.) stimulus duration was significantly superior to a group given a longer (5-sec.) interstimulus interval in the middle trial.