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Base rates: both neglected and intuitive.

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Area of Science:

  • Cognitive Psychology
  • Decision Making
  • Behavioral Economics

Background:

  • Base-rate neglect is the tendency to underweight base-rate probabilities in favor of diagnostic information.
  • This neglect is often attributed to the effortful (Type 2) processing required for base-rates versus the intuitive (Type 1) processing of diagnostic information.

Purpose of the Study:

  • To investigate whether base-rate information requires effortful (Type 2) processing or can be accessed by intuitive (Type 1) processing.
  • To challenge the prevailing theory that base-rate neglect stems solely from the cognitive demands of processing base-rate data.

Main Methods:

  • Participants responded to base-rate problems, presented with either conflicting or coinciding stereotypes and base-rate probabilities.
  • Experiments were conducted with both ample time and under time constraints to assess processing demands.
  • Response times and confidence levels were measured to index cognitive interference.

Main Results:

  • Base-rates interfered with belief-based judgments similarly to how stereotypes interfered with statistical judgments.
  • This interference was evidenced by increased response times and decreased confidence in conflict conditions.
  • The findings indicate that base-rates do not exclusively require Type 2 processing.

Conclusions:

  • Base-rate information is not necessarily computationally demanding and can be processed via intuitive (Type 1) cognitive processes.
  • The typical underweighting of base-rates may occur for reasons other than the cognitive effort required for their processing.
  • This research reframes our understanding of cognitive biases in decision-making and probability assessment.