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Related Experiment Videos

Typicality and reasoning fallacies.

E B Shafir1, E E Smith, D N Osherson

  • 1Department of Psychology, Princeton University, NJ 08544.

Memory & Cognition
|May 1, 1990
PubMed
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People often judge probability based on typicality, leading to conjunction and inclusion fallacies. This research explores how typicality influences probability judgments and decision-making in cognitive psychology.

Area of Science:

  • Cognitive Psychology
  • Decision Science
  • Behavioral Economics

Background:

  • Tversky and Kahneman's research highlights heuristics in intuitive probability judgment.
  • Typicality of an instance in a category often influences perceived probability.

Purpose of the Study:

  • To test the prediction that judged probability increases with instance typicality.
  • To investigate conjunction and inclusion fallacies in probability assessment.

Main Methods:

  • Experiment 1: Subjects rated typicality and probability for descriptions and categories, including conjunctive categories.
  • Experiment 2 & 3: Investigated the inclusion fallacy using conditional statements about categories.

Main Results:

Related Experiment Videos

  • Subjects showed a conjunction effect (more typical of conjunctive categories) and a conjunction fallacy (higher probability for conjunctive categories).
  • The conjunction effect and fallacy were strongly correlated.
  • An inclusion fallacy was observed, where specific subsets were judged less probable than broader categories.

    • Conclusions:

    • Typicality strongly influences probability judgments, often leading to systematic errors like conjunction and inclusion fallacies.
    • These findings underscore the role of cognitive heuristics in decision-making and probability assessment.