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Threshold point utilisation in juror decision-making.

Lee J Curley1, Rory MacLean1, Jennifer Murray1

  • 1School of Applied Sciences, Edinburgh Napier University, Edinburgh, Scotland.

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|January 28, 2020
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Summary
This summary is machine-generated.

A flexible diffusion model best describes juror decision-making, integrating rational and intuitive processes. This model offers a new framework for understanding how jurors process evidence and reach verdicts.

Keywords:
courtroomcue utilisationdecision-makingheuristicsinformation integrationjurorslawnot proven verdictpsychologystopping rule

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Area of Science:

  • Cognitive Psychology
  • Legal Psychology
  • Decision Science

Background:

  • Juror decision-making models often focus on either rational or intuitive processes.
  • A comprehensive model encompassing both is needed to accurately reflect real-world jury deliberations.

Purpose of the Study:

  • To investigate the existence of a juror decision-making model that integrates both rational and intuitive cognitive processes.
  • To determine if the threshold point model or a diffusion model better explains how jurors integrate evidence.

Main Methods:

  • Sixty Scottish jury-eligible participants evaluated nine vignettes.
  • Evidence was categorized as guilty, not guilty, or not proven.
  • Participants rated suspect guilt likelihood (1-100) after each piece of information.

Main Results:

  • Data analysis indicated that a flexible diffusion model provides a superior fit for juror decision-making.
  • The diffusion model effectively captures the integration of information over time.

Conclusions:

  • The diffusion model is a promising framework for understanding juror information integration.
  • Future research should explore the diffusion model's capacity to explain cognitive biases like confirmation bias in legal decision-making.