In addition to the simple demonstration of forgetting, it was found in Experiment 1 that the amount of forgetting progressively increased, in a negatively accelerated fashion, over intervals of 1, 10 and 20 days. Also, it was found that more forgetting occurred for a reverse discrimination than for a single discrimination. In Experiment 2 it was found that acquisition was retarded and more forgetting occurred for discriminations which involved highly similar stimuli. It was argued that these data represent the first reported instance of intraproblem similarity effects on retention in animals. In Experiment 3 the role of contextual cues on forgetting was examined. It was found that a change in contextual cues between acquisition and retention testing enhanced forgetting, when the contextual cues present during original acquisition were conspicuous; when these cues were relatively inconspicuous, a change in context had no effect on forgetting.
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