MENTAL MODEL · M0214

The Forgetting Curve

Learn & MetacognitionHigh supportCognitive Psychology

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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

The Forgetting Curve is a curve used to describe the rate of forgetting in long-term memory. It was first proposed by psychologist Hermann Ebbinghaus based on his experiments conducted from 1880 to 1885. In these experiments, Ebbinghaus used meaningless letter combinations. By memorizing these combinations and checking the forgetting rate after a series of time intervals, he obtained this curve. Therefore, this curve is also called the Ebbinghaus Forgetting Curve.

SCAFFOLDING EFFECT

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Ebbinghaus used nonsense syllables in self-experiments and found that memory retention decays exponentially with a negative acceleration over time: forgetting is rapid initially (most severe on the first day), then slows down. The mechanism is the natural decay of memory traces and interference (proactive/retroactive inhibition). The key is that 'relearning is faster than initial learning', and each review resets and flattens the curve.

MINIMUM ACTION

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Practice this model in one real situation:

Schedule the first review immediately after learning (e.g., the same day). 2. Review at increasing intervals (1, 2, 4, 7, 15 days), i.e., spaced repetition. 3. Use active recall (self-testing) rather than rereading. 4. Review before the forgetting threshold for maximum efficiency. 5. Use tools (e.g., Anki) to automatically schedule intervals.

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Source support: Explicit

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zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E9%81%97%E5%BF%98%E6%9B%B2%E7%BA%BFZH · Explicit
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