According to decay theory, we forget memories because we don't use them and they fade away over time as a matter of normal brain processes.

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Decay theory proposes that forgetting occurs due to the gradual fading of the memory trace over time as a result of disuse. It suggests that memories that are not frequently accessed or rehearsed will eventually decay and become less available for retrieval.

According to Decay Theory, We Forget Memories Because We Don't