Mental models and human reasoning

Proc Natl Acad Sci U S A. 2010 Oct 26;107(43):18243-50. doi: 10.1073/pnas.1012933107. Epub 2010 Oct 18.

Abstract

To be rational is to be able to reason. Thirty years ago psychologists believed that human reasoning depended on formal rules of inference akin to those of a logical calculus. This hypothesis ran into difficulties, which led to an alternative view: reasoning depends on envisaging the possibilities consistent with the starting point--a perception of the world, a set of assertions, a memory, or some mixture of them. We construct mental models of each distinct possibility and derive a conclusion from them. The theory predicts systematic errors in our reasoning, and the evidence corroborates this prediction. Yet, our ability to use counterexamples to refute invalid inferences provides a foundation for rationality. On this account, reasoning is a simulation of the world fleshed out with our knowledge, not a formal rearrangement of the logical skeletons of sentences.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • Brain / physiology
  • Cognition* / physiology
  • Humans
  • Logic
  • Magnetic Resonance Imaging
  • Memory
  • Models, Neurological
  • Models, Psychological*