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Introduction
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Forgetting can feel like a single event: information was available before and is unavailable now. In practice, several different processes can produce that experience.
The information may have been learned weakly. Similar information may compete with it. The current question may provide an unhelpful cue. Some information also becomes less accessible over time, especially when it is not revisited or used.
Understanding these possibilities helps you choose a useful response. It also prevents one unsuccessful attempt from becoming a sweeping conclusion about your memory.