Pictorial sti~uli were used to investigate implicit-and explicit-memory phenomena in 3 experiments: The genera) procedure involved the presentation of a series of pictures during a study phase, followed by an implicit-memory test and an explicit-memory test. In the implicit-memory test, participants were presented with picture fragments and were instructed to write down what the fragment looked like. In the explicit-memory test, participants were asked to make a yes/no recognition decision

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... ding each picture. For children, implicit memory for pictures was robust when they were tested after a 48-hr intervaJ, but that effect declined after I week; a similar implicit-memory effect for pictures was seen with college students; and the time course of the implicit-memory effect for pictures among college students (aU soon intervals of less than I week-I. 2, 3,4, and S days) produced a more elevated implicit-memory performance than during the immediate testing condition. Hypermnesia may have been the cause of the increase in memory performance over the short intervals.