MENTAL MODEL · M4442

Change Blindness

Learn & MetacognitionHigh supportCognitive Psychology

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Updated 2026-08-02

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INTRODUCTION

English translation pending.

CORE DEFINITION

A robust finding in visual cognition, studied by Daniel Simons and others. When a scene changes during a brief interruption such as a blink, a saccade, or a screen flicker, observers often fail to notice even large changes. The finding shows that visual experience is not a continuous recording but a sparse sampling filled in by memory and prediction. Detecting a change requires attention to the location and a representation stable enough to compare.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Guide attention: use motion, contrast, or highlighting to mark what has changed - Avoid masked updates: never change critical information during a flicker or transition - Assume missed: treat not seeing a change as weak evidence that it did not happen

anchor

Anchor fast decisions

The visual system samples the scene sparsely and fills the gaps with prediction rather than storing a detailed picture. When a change occurs during an interruption, no persistent representation exists to compare against, so the discrepancy is never registered. The change must fall within the focus of attention to be encoded at all, which is why large changes outside attention pass unnoticed.

MINIMUM ACTION

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Practice this model in one real situation:

Identify the interfaces or environments where critical information changes. 2. Avoid updating them during flickers or transitions. 3. Use motion or highlighting to draw attention to changes. 4. Train people to treat not seeing as no evidence of absence.

Check to track your progress (stored locally)

Learning progress0%

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Source support: Explicit

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