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Related Experiment Videos

Base rates versus sample accuracy: competition for control in human matching to sample.

A S Goodie1, E Fantino

  • 1Department of Psychology, University of Georgia, Athens 30602-3013, USA.

Journal of the Experimental Analysis of Behavior
|April 30, 1999
PubMed
Summary

People often ignore reliable statistical information (base rates) and focus too much on specific details (case cues), a bias known as base-rate neglect. This study confirms this neglect occurs even in nonverbal decision-making tasks.

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Area of Science:

  • Cognitive Psychology
  • Behavioral Economics
  • Decision Science

Background:

  • Base-rate neglect is a cognitive bias where individuals overweight specific case information while undervaluing general statistical information (base rates).
  • Previous research primarily used verbal or paper-and-pencil tasks to demonstrate base-rate neglect.
  • The occurrence and mechanisms of base-rate neglect in nonverbal, experiential learning contexts remained less understood.

Purpose of the Study:

  • To investigate the phenomenon of base-rate neglect in a nonverbal, matching-to-sample procedure.
  • To examine how individuals weigh case cues versus base rates when making probabilistic choices.
  • To determine if base-rate neglect persists in environments with direct experiential feedback.

Main Methods:

Related Experiment Videos

  • Two nonverbal experiments were conducted using a matching-to-sample procedure with probabilistic reinforcement.
  • Participants made discrete choices between two response options across hundreds of trials.
  • Experiment 1 manipulated the predictive accuracy of one sample while keeping the other unpredictive; Experiment 2 varied base rates and sample accuracy concurrently.

    • Main Results:

    • In Experiment 1, choices for the unpredictive sample were primarily dictated by the contingencies of the predictive sample, showing weak base-rate control.
    • Experiment 2 revealed that participants' choices were mainly influenced by overall sample accuracy, again demonstrating weak base-rate control.
    • The observed choice patterns persisted regardless of whether they increased or decreased the overall reinforcement rate.

    Conclusions:

    • The study provides empirical evidence of base-rate neglect in nonverbal, experiential decision-making.
    • Individuals exhibit a strong tendency to rely on specific cues over statistical base rates, even when base rates are highly predictive.
    • Findings highlight the robustness of base-rate neglect across different task formats and learning conditions.