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MENTAL MODEL · M11966

Decay Theory

Decay Theory
Learn & MetacognitionHigh supportCognitive Psychology
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Updated 2026-09-11

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INTRODUCTION

English translation pending.

CORE DEFINITION

Decay theory proposes that memory traces weaken automatically over time unless they are reactivated, an idea commonly traced to Edward Thorndike's law of disuse, with Ivan Pavlov's conditioning work often cited as support and Donald Hebb later giving it a neural formulation. Its core claim is that forgetting is a function of elapsed time rather than of what intervenes. The key limitation is testability: apparent time-based forgetting is often explained just as well by interference from other material or by missing retrieval cues, so decay is rarely treated as the sole cause.

SCAFFOLDING EFFECT

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- Diagnose the cause: separate elapsed time, interfering material, and missing cues before choosing an intervention. - Schedule rehearsal: use spaced review and active recall to counteract fading of important content. - Restore cues: when material feels familiar but irretrievable, add retrieval cues instead of restudying.

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A memory trace is a pattern of neural activity that must be reactivated to persist, so without rehearsal its strength declines and the threshold for retrieval rises. Time itself is not the active agent, which is why the theory is hard to isolate from interference and cue failure. In practice this means strengthening the trace through retrieval, and supplying the right cue at recall, offset decay more effectively than mere exposure.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Decay_theoryZH · Explicit
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