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Related Experiment Videos

Bias in conditional inference: implications for mental models and mental logic

J S Evans1, J Clibbens, B Rood

  • 1Department of Psychology, University of Plymouth, U.K.

The Quarterly Journal of Experimental Psychology. A, Human Experimental Psychology
|August 1, 1995
PubMed
Summary

This study on conditional reasoning found a robust negative conclusion bias, particularly in denial of the antecedent (DA) and modus tollens (MT) inferences. This suggests a difficulty with double negation in propositional reasoning.

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Area of Science:

  • Cognitive Psychology
  • Logic
  • Human Reasoning

Background:

  • Conditional statements are fundamental to logical reasoning.
  • Previous research suggested an 'affirmative premise bias' in drawing inferences.
  • The impact of negation placement on reasoning biases was unclear.

Purpose of the Study:

  • To investigate the generality and robustness of polarity biases in conditional reasoning.
  • To examine how systematic rotation of negative components affects inference patterns.
  • To test the 'affirmative premise bias' and identify other potential biases.

Main Methods:

  • Three experiments were conducted using conclusion evaluation and production tasks.
  • Varied conditional statement forms: 'if (not) p then (not) q', '(not) p only if (not) q', and '(not) q if (not) p'.

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  • Experiment 3 used thematic conditionals with and without preceding scenarios.

    • Main Results:

    • The 'affirmative premise bias' was not supported by the experimental data.
    • A robust negative conclusion bias was consistently observed across all experiments.
    • This bias was predominantly linked to denial of the antecedent (DA) and modus tollens (MT) inferences.

    Conclusions:

    • The findings do not support the 'affirmative premise bias'.
    • A significant negative conclusion bias suggests difficulties with double negation in reasoning.
    • Current mental logic and mental model theories require revision to fully account for these results.