Two Implications and Dual-Process Theories of Reasoning

Angelina Bobrova and Ahti Pietarinen


Dual-process theories of reasoning assume a fundamental difference between two cognitive systems: fast and intuitive System 1, and slow and rational System 2, grounded on rules of logical inference. Peirce’s diagrammatic logic challenges the dichotomy. Both systems are based on similar inferential connections, but the former draws its conclusions as modelled in positive implicational fragment of the latter. This logical connection between two systems explains empirical results from Wason’s card selection task without appeal to confirmation bias.

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