A different, yet perhaps complementary, answer is forthcoming in the research tradition of cognitive psychology. Here, a variety of studies suggest that gaps in one's rehearsal or study schedule are so helpful because, counterintuitively, they create the opportunity for a salutary bit of forgetting.To understanding how forgetting can be useful, it's important to first recognise that a memory is never simply strong or weak. Rather, the ease with which you can summon up a memory (its retrieval strength) is different from how fully represented it is in your mind (its storage strength).
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