Category Mistakes
Updated 2026-09-10
INTRODUCTION
English translation pending.
CORE DEFINITION
Category mistakes are sentences such as the number two is blue, relativity theory is eating breakfast, or the green idea sleeps angrily. They are distinctly odd: unlike plain falsehoods such as two plus two equals five, and unlike ungrammatical strings. Gilbert Ryle made the notion central in The Concept of Mind. Contemporary debate asks where the oddity comes from, whether from semantics, pragmatics, or presupposition failure.
SCAFFOLDING EFFECT
Reduce cognitive load
- Detect predicate mismatch: check whether the predicate demands a property the subject could not possibly have. - Separate nonsense from falsehood: decide whether a sentence is false or fails at the level of combination. - Clarify category ascription: use the oddity to infer which category the speaker assigned to the object.
Anchor fast decisions
These sentences give something a property it could not possibly have: only spatiotemporal particulars have colors, and numbers do not; only things that can eat can eat breakfast. Because predicates impose categorical applicability requirements on their subjects, violating those requirements makes the sentence fail at the level of combination rather than simply be false, yielding either meaninglessness or presupposition failure.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- plato.stanford.eduhttps://plato.stanford.edu/entries/category-mistakes/verified
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