The logic of fast and slow thinking

Anthia Solaki, Francesco Berto*, Sonja Smets

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)
3 Downloads (Pure)


We present a framework for epistemic logic, modeling the logical aspects of System 1 (“fast”) and System 2 (“slow”) cognitive processes, as per dual process theories of reasoning. The framework combines non-normal worlds semantics with the techniques of Dynamic Epistemic Logic. It models non-logically-omniscient, but moderately rational agents: their System 1 makes fast sense of incoming information by integrating it on the basis of their background knowledge and beliefs. Their System 2 allows them to slowly, step-wise unpack some of the logical consequences of such knowledge and beliefs, by paying a cognitive cost. The framework is applied to three instances of limited rationality, widely discussed in cognitive psychology: Stereotypical Thinking, the Framing Effect, and the Anchoring Effect.

Original languageEnglish
VolumeIn press
Early online date1 Jun 2019
Publication statusE-pub ahead of print - 1 Jun 2019


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