 | Johnson-Laird argues the mind reasons by constructing mental models — small internal simulations of how a situation could work — not by applying abstract logical rules alone. You test possibilities, discard contradictions, and update the sketch when reality pushes back. Johnson-Laird (1983) · Harvard University Press · ISBN 9780674568818 |
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Key principles
- Model-based inference — Reasoning runs on simulated states of affairs — what would be true if this picture held — not only on syntactic rules.
- Possibilities and counterexamples — You search for a model that fits the premises; one counterexample can falsify a conclusion — falsifiability lives in the sketch.
- Limited working models — The mind keeps one workable model in focus by default — reasoners overlook alternatives when the first story coheres (illusions of validity).
- Language and representation — Comprehension builds a mental model of described scenes — meaning is grounded in what could be true in the world, not word magic alone.
- Consciousness as model access — Awareness relates to which models are currently constructed and inspected — not a separate substance layered on top.
- Update on mismatch — When the world violates the model, revise the diagram — stubborn error is often an unrevised sketch, not low IQ.
Core science
Johnson-Laird’s program launched the mental-models branch of cognitive science — alternative to pure rule-based logic theories of reasoning. Later work on syllogistic errors, conditional reasoning, and scientific discovery extends the same spine: people often reason convincingly yet wrongly because their initial model was incomplete. Popular “mental models” in business borrow the phrase with less formal rigour — this volume is the academic anchor behind the Atlas Mental Model pillar. Pair with The Glassbox Mindset when the coaching move is to make the model inspectable.
Application
Reach when a member defends a prediction that collapses on one counterexample — or when I already know how this works is a frozen sketch. Open Mental Model on the Atlas shelf for the operational map; build one falsifiable diagram before the next strategy meeting.