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# Quantum Cognition
- URL: https://www.saraburke.net/quantum-cognition/
- Published: 2014-06-03T00:00:00.000Z
- Updated: 2022-12-29T06:50:38.000Z
- Author: Sara Burke

> In contrast to a two-valued (yes/no) logic of classical binary alternatives, where the complement of a proposition is identical with its negation, the complement of a quantum proposition typically deviates from its negation. A nice colloquial example is due to William James (1890b, p. 284): “The true opposites of belief… are doubt and inquiry, not disbelief.” **In the Boolean sense, the complement and negation of belief is disbelief; in the quantum non-Boolean sense, doubt and inquiry are complements but not negations of belief.**

From [The potential of using quantum theory to build models of cognition](http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list%5Fuids=24027215&ref=saraburke.net).