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Related Experiment Videos

The inverse base-rate effect is not explained by eliminative inference.

J K Kruschke1

  • 1Department of Psychology, Indiana University Bloomington, 47405-7007, USA. kruschke@indiana.edu

Journal of Experimental Psychology. Learning, Memory, and Cognition
|November 21, 2001
PubMed
Summary

The inverse base-rate effect occurs when people favor rare outcomes despite learning common ones. Eliminative inference does not explain this, but attentional theory does.

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Area of Science:

  • Cognitive Psychology
  • Decision Making
  • Human Behavior

Background:

  • The inverse base-rate effect describes predicting rare outcomes over common ones with conflicting cues.
  • Explanations include eliminative inference and attention-shifting theory.

Purpose of the Study:

  • To evaluate eliminative inference and attention-shifting theory as explanations for the inverse base-rate effect.
  • To test theoretical models against existing and new experimental data.

Main Methods:

  • Analysis of existing data and results from two new experiments.
  • Comparison of predictions from eliminative inference and connectionist attention models.
  • Evaluating ordinal discrepancies between models and empirical data.

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Main Results:

  • The eliminative inference model showed ordinal discrepancies with the data.
  • A connectionist implementation of attentional theory provided a good fit to the data.
  • Empirical data did not support eliminative inference as the sole explanation.

Conclusions:

  • While humans can employ eliminative inference, it does not fully account for the inverse base-rate effect.
  • Attention-shifting mechanisms, particularly as modeled by connectionist approaches, better explain the observed phenomenon.
  • Further research into attentional processes is warranted to understand this cognitive bias.