Decay Theory

Decay Theory suggests that memories fade and disappear over the natural passage of time, especially if they are not accessed frequently. Although there are other factors that are suspected to cause memory disappearance, decay theory encompasses the broad loss and decay of memories over time. It affects mostly short term memories and if a memory isn't recalled frequently it is more likely to be lost or lessened in strength.

See also: Forgetting

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History of Psychology
History of Psychology