The effect of legal professional opinion on lay citizens' judgment during deliberation : Focusing on changes and confidence in the judgment(<Featured articles>For the re-examination on Saiban-in System: From the perspective of Law and Psychology (I))

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  • MURAYAMA Aya
    Department of Psychological Science, Center for Applied Psychological Science, Kwansei Gakuin University
  • IMAZATO Uta
    Department of Psychological Science, Kwansei Gakuin University
  • MIURA Asako
    Department of Psychological Science, Kwansei Gakuin University

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  • 評議における法専門家の意見が非専門家の判断に及ぼす影響 : 判断の変化および確信度に注目して(<サブ特集>裁判員制度の見直しに向けて:法と心理学の視点からI)
  • 評議における法専門家の意見が非専門家の判断に及ぼす影響 : 判断の変化および確信度に注目して
  • ヒョウギ ニ オケル ホウ センモンカ ノ イケン ガ ヒセンモンカ ノ ハンダン ニ オヨボス エイキョウ : ハンダン ノ ヘンカ オヨビ カクシンド ニ チュウモク シテ

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Abstract

This study investigated whether professional opinion during deliberations influenced changes in jurors' opinions. Three jurors (naive participants) and one judge (a confederate who claimed guilty throughout the experiment) discussed guilt or innocence using a scenario that was based on an actual case. A total of 93 university students (31 groups) participated in the study. Opinion distributions (guilty as majority, tie votes, or innocent as majority) and forms of deliberation (either verdict-driven or evidence-driven) were manipulated. The results revealed that jurors tended to change their opinion in accordance with the judge. Moreover, jurors whose opinions coincided with the judge's opinion were more confident of their final decisions than jurors whose final decisions were different from the judge's. Finally, the suggestions about the lay judge system and deliberation process were made based on the results of the study.

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