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The conjunction fallacy in rats.

Valeria V González1, Sowgol Sadeghi2, Linh Tran2

  • 1Department of Psychology, University of California Los Angeles, 1285 Franz Hall, Los Angeles, CA, 90095-1563, USA. vgonzalez@psych.ucla.edu.

Psychonomic Bulletin & Review
|February 16, 2023
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Summary
This summary is machine-generated.

Rats exhibit a conjunction fallacy, overestimating combined event likelihood. This reasoning error in animals was reduced by increasing element trials, suggesting cognitive mechanisms for probability estimation.

Keywords:
Conjunction fallacyHeuristicsRatsReasoning

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Area of Science:

  • Cognitive Science
  • Animal Behavior
  • Behavioral Economics

Background:

  • Humans and animals demonstrate reasoning abilities, but are prone to errors.
  • The conjunction fallacy, where combined events are deemed more likely than individual ones, is a known human cognitive bias.

Purpose of the Study:

  • To investigate if rats exhibit the conjunction fallacy, mirroring human cognitive errors.
  • To explore if modifying trial ratios can attenuate this fallacy in rats.

Main Methods:

  • Rats were trained using food reinforcement to associate auditory cues (A, B) with lever pressing under specific visual cue conditions (AX, BY).
  • Test sessions involved ambiguous trials where rats had to infer compound cues (AX, BY) versus element cues (A, B).
  • Experiment 2 manipulated the ratio of element to compound trials (50-50, 70-30, 90-10) to assess impact on fallacy occurrence.

Main Results:

  • Rats responded to ambiguous trials as if compound cues were more probable, indicating a conjunction fallacy.
  • The conjunction fallacy was observed across most conditions, except for the 90-10 ratio group, which showed a significant reduction.

Conclusions:

  • Rats demonstrate a conjunction fallacy, suggesting shared cognitive mechanisms for probability estimation errors with humans.
  • Adjusting the learning environment, specifically increasing the proportion of element trials, can mitigate this reasoning bias in rats.