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Related Experiment Videos

Illusions in reasoning about consistency.

P N Johnson-Laird1, P Legrenzi, V Girotto

  • 1Department of Psychology, Princeton University, Princeton, NJ 08544, USA. phil@princeton.edu

Science (New York, N.Y.)
|April 25, 2000
PubMed
Summary
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People often misjudge logical consistency due to predictable illusions. This occurs because we focus on what

Area of Science:

  • Cognitive psychology
  • Human rationality
  • Computational complexity

Background:

  • Evaluating the consistency of logical assertions, known as the satisfiability problem, is a complex cognitive task.
  • Previous research suggests human reasoning can be prone to systematic errors and biases.

Purpose of the Study:

  • To investigate the predictable illusions that affect human judgment in satisfiability tasks.
  • To understand how the number of compatible possibilities influences task difficulty and reasoning strategies.

Main Methods:

  • Two studies were conducted on the computational task of satisfiability.
  • Participants evaluated the consistency of sets of assertions.

Main Results:

  • Task difficulty increases as the number of compatible possibilities grows.

Related Experiment Videos

  • Reasoners focus on representing true information, not false information, to manage cognitive load.
  • This selective representation leads to illusions of both consistency and inconsistency.

    • Conclusions:

    • Human reasoning in satisfiability tasks is susceptible to predictable illusions.
    • The strategy of representing only true information, while efficient, distorts judgments of logical consistency.
    • These findings necessitate a revision of our understanding of human rationality.