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Related Experiment Videos

Thinking about low-probability events. An Exemplar-Cuing theory.

Jonathan J Koehler1, Laura Macchi

  • 1McCombs School of Business and School of Law, The University of Texas at Austin, TX 78712-1175, USA. koehler@mail.utexas.edu

Psychological Science
|July 24, 2004
PubMed
Summary

People weigh unlikely events more when they can easily imagine them happening. This impacts legal judgments, like DNA evidence, showing how event descriptions influence perceived probability.

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Area of Science:

  • Cognitive Psychology
  • Legal Psychology
  • Decision Science

Background:

  • The perceived likelihood of unlikely events is influenced by descriptive framing.
  • Cognitive biases can affect judgment, particularly in legal contexts.

Purpose of the Study:

  • To investigate how the ease of imagining unlikely events affects their perceived weight.
  • To examine the impact of event description on mock juror decision-making regarding DNA evidence.

Main Methods:

  • Two experiments were conducted using mock jurors presented with written murder scenarios.
  • The difficulty of imagining alternative explanations for DNA matches was manipulated by varying statistical descriptions.
  • Juror responses to the defendant's claim of coincidence were measured.

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Main Results:

  • Mock jurors assigned more weight to the defendant's coincidence claim when it was easier to imagine other individuals with matching DNA.
  • The ease of generating examples of coincidental matches significantly influenced jurors' perceptions.
  • Normatively irrelevant variations in statistical descriptions affected juror judgments.

Conclusions:

  • The ability to easily imagine unlikely events increases their perceived probability and influence on decisions.
  • Descriptive framing of statistical evidence, even irrelevant details, can sway legal judgments.
  • Understanding these cognitive biases is crucial for ensuring fair legal proceedings.