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Related Experiment Videos

The conjunction fallacy?

G Wolford1, H A Taylor, J R Beck

  • 1Department of Psychology, Dartmouth College, Hanover, NH 03755.

Memory & Cognition
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

The conjunction fallacy occurs when people judge a conjunction of events as more likely than a single event. This study demonstrates that context can influence this cognitive bias, and statistical training can mitigate it.

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Area of Science:

  • Cognitive Psychology
  • Decision Science
  • Behavioral Economics

Background:

  • The conjunction fallacy, as described by Tversky and Kahneman (1983), is a common error in probability judgment where individuals deem a conjunction of events more likely than a single constituent event.
  • This fallacy is considered a violation of basic probability axioms, as the probability of a conjunction cannot exceed the probability of its components.
  • Prior research indicated that even training in probability theory does not significantly reduce the occurrence of this fallacy.

Purpose of the Study:

  • To investigate whether contextual framing can alter the perception of conjunction probabilities.
  • To determine if manipulating context influences the frequency of the conjunction fallacy.
  • To examine the effect of statistical training on conjunction fallacy rates when context is clearly defined.

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Main Methods:

  • Four experiments were conducted, systematically manipulating the contextual information presented to participants.
  • Participants were asked to rate the likelihood of various single and joint events under different contextual conditions.
  • The frequency of participants committing the conjunction fallacy was recorded and analyzed in relation to the manipulated context.

Main Results:

  • Contextual manipulation significantly affected the frequency with which participants committed the conjunction fallacy.
  • When context was clearly specified, participants with prior statistical training showed a reduced tendency to make the conjunction fallacy.
  • These findings suggest that the conjunction fallacy is not solely an inherent cognitive error but is also context-dependent.

Conclusions:

  • The conjunction fallacy is not always a fallacy; in certain contexts, a conjunction can indeed be more probable than a single event.
  • Contextual factors play a crucial role in probability judgments and the manifestation of cognitive biases.
  • Clear contextual specification, combined with statistical knowledge, can help individuals avoid the conjunction fallacy.