Motivation-Reaction Units
Updated 2026-07-31
INTRODUCTION
English translation pending.
CORE DEFINITION
Motivation-Reaction Units, usually shortened to MRUs, were formalized by writing instructor Dwight Swain. An MRU pairs an external stimulus, the motivation, with the character's response, the reaction, which may be a feeling, a reflex, speech, or an action. The binding rule is order: motivation always precedes reaction, because the reader's causal understanding follows real-world physical sequence. The qualifier is scope, since MRUs govern micro-level sentence order and say nothing about whether a story may use flashbacks or a non-linear structure at the level of the whole narrative.
SCAFFOLDING EFFECT
Reduce cognitive load
- Order repair: Check that the external stimulus is stated before the character's response to it. - Causality scan: Find sentences where the reader must back-fill a cause that was withheld. - Chain building: Use each reaction as the setup for the next motivation in the scene.
Anchor fast decisions
Readers reconstruct cause and effect in the order the physical world delivers it. When a text shows the response first, the brain registers a small mismatch and must reverse-engineer the cause, which costs attention. Repeating that mismatch accumulates friction and breaks immersion. Putting motivation first lets comprehension run forward with no correction, so attention stays on the story instead of on the sentence.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
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