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Effects of emotional information in trials on lay-judges' decision

Research Project

Project/Area Number 23330198
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Social psychology
Research InstitutionKeio University

Principal Investigator

ITOH Yuji  慶應義塾大学, 文学部, 教授 (70151545)

Co-Investigator(Kenkyū-buntansha) NAKA Makiko  北海道大学, 文学研究科, 教授 (00172255)
ITSUKUSHIMA Yukio  日本大学, 文理学部, 教授 (20147698)
Co-Investigator(Renkei-kenkyūsha) IBUSUKI Makoto  成城大学, 法学部, 教授 (70211753)
Project Period (FY) 2011-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
Fiscal Year 2013: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2012: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2011: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Keywords裁判員 / 感情 / バイアス / 被害者の意見陳述 / 事実認定判断 / 遅延時間の効果 / 二重過程理論
Research Abstract

In courtrooms, lay judges are exposed to a lot of inflammatory information. information. We examined if lay judges are influenced by their emotion and make biased decisions, and sought means to prevent such influences with mock lay-judge experiments. Results show that lay judges' emotions such as anger and sympathy correlates with guiltiness judgment. The possibility that lay judges' decisions are influenced by their emotions is shown. It is also shown that we could suppress the effects of emotion by the means like instruction on judicial procedures and/or principle of decision making in the courtroom and having the delay between the trials and decision.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (20 results)

All 2014 2013 2012 2011 Other

All Journal Article (1 results) Presentation (19 results) (of which Invited: 4 results)

  • [Journal Article] 情報処理の方法と刑事裁判の原則説明が裁判員の判断に及ぼす影響2012

    • Author(s)
      松尾加代
    • Journal Title

      慶應義塾大学大学院社会学研究科紀要

      Volume: 74 Pages: 127-130

    • Related Report
      2013 Final Research Report 2012 Annual Research Report
  • [Presentation] 手続き二分:裁判員の判断過程の心理学的研究から2014

    • Author(s)
      伊東裕司
    • Organizer
      法と心理学会理事第15回大会
    • Place of Presentation
      関西学院大学(兵庫県)
    • Related Report
      2013 Annual Research Report
  • [Presentation] Effects of systematic information processing on mock jurors' decisions2013

    • Author(s)
      Matsuo, K. & Itoh, Y
    • Organizer
      The 9th International Conference on Cognitive Science
    • Place of Presentation
      Kuching, Malaysia
    • Year and Date
      2013-08-28
    • Related Report
      2013 Final Research Report
  • [Presentation] Effects of victim impact statements and sympathetic photographs on mock jurors' decisions2013

    • Author(s)
      Matsuo, K. & Itoh, Y
    • Organizer
      The 10th Biannual Meeting of Society for Applied Research in Memory and Cognition
    • Place of Presentation
      Rotterdam, Netherlands
    • Year and Date
      2013-06-29
    • Related Report
      2013 Final Research Report
  • [Presentation] 模擬裁判員の認知欲求レベルによる事実認定判断と感情喚起の違い2012

    • Author(s)
      松尾加代
    • Organizer
      第2回日本情動学会大会
    • Place of Presentation
      東京慶應義塾大学
    • Year and Date
      2012-12-22
    • Related Report
      2013 Final Research Report
  • [Presentation] 裁判員のネガティブ感情と事実認定判断(2)2012

    • Author(s)
      伊東裕司
    • Organizer
      日弁連刑事弁護センター第1回供述分析研究会
    • Place of Presentation
      東京 弁護士会館
    • Year and Date
      2012-08-28
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] 裁判員のネガティブ感情と事実認定判断(1)2012

    • Author(s)
      松尾加代
    • Organizer
      日弁連刑事弁護センター第1回供述分析研究会
    • Place of Presentation
      東京 弁護士会館
    • Year and Date
      2012-08-28
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Influence of negative emotions on mock lay judges' verdict decisions2012

    • Author(s)
      Matsuo, K
    • Organizer
      2012 International Conference on Law and Society
    • Place of Presentation
      Honolulul, Hawaii
    • Year and Date
      2012-06-06
    • Related Report
      2013 Final Research Report
  • [Presentation] 事実認定の原則説明方法と認知欲求レベルが裁判員の判断に及ぼす影響2011

    • Author(s)
      松尾加代
    • Organizer
      法と心理学会第12回大会
    • Place of Presentation
      名古屋
    • Year and Date
      2011-10-01
    • Related Report
      2011 Annual Research Report
  • [Presentation] How do instructions and Need for Cognition influence mock lay judges' decision?2011

    • Author(s)
      Matsuo, K.
    • Organizer
      The 12th European Congress of Psychology
    • Place of Presentation
      Istanbul, Turky
    • Year and Date
      2011-07-04
    • Related Report
      2011 Annual Research Report
  • [Presentation] Comparing college student and adult mock jurors in decision and emotion2011

    • Author(s)
      Matsuo, K.
    • Organizer
      The 9th Biennial Meeting of the Society for Applied Research in Memory and Cognition
    • Place of Presentation
      New York
    • Year and Date
      2011-06-28
    • Related Report
      2011 Annual Research Report
  • [Presentation] Effects of victim impact statements and sympathetic photographs on mock jurors’ decisions

    • Author(s)
      Matsuo, K., & Itoh, Y.
    • Organizer
      The 10th Biannual Meeting of Society for Applied Research in Memory and Cognition
    • Place of Presentation
      Rotterdam, Netherlands
    • Related Report
      2013 Annual Research Report
  • [Presentation] Effects of Systematic Information Processing on Mock Jurors’ Verdict Decisions

    • Author(s)
      Matsuo, K., & Itoh, Y.
    • Organizer
      The 9th International Conference on Cognitive Science
    • Place of Presentation
      Kuching, Malaysia
    • Related Report
      2013 Annual Research Report
  • [Presentation] Psychological Distance affect on Face Recognition: Generalized Activation Model

    • Author(s)
      Hine, K. and Itoh, Y.
    • Organizer
      The 9th International Conference on Cognitive science
    • Place of Presentation
      Kuching, Malaysia
    • Related Report
      2013 Annual Research Report
  • [Presentation] 想像課題から顔の再認課題への処理の持ち越し効果の検討

    • Author(s)
      日根恭子・伊東裕司
    • Organizer
      日本認知科学会第30回大会
    • Place of Presentation
      玉川大学(東京都)
    • Related Report
      2013 Annual Research Report
  • [Presentation] Influence of negative emotions on mock lay judges’ verdict decisions

    • Author(s)
      松尾加代
    • Organizer
      2012 International Conference on Law and Society
    • Place of Presentation
      Honolulu, Hawaii
    • Related Report
      2012 Annual Research Report
  • [Presentation] 裁判員のネガティブ感情と事実認定判断(1)

    • Author(s)
      松尾加代
    • Organizer
      日弁連刑事弁護センター 第1回供述分析研究会
    • Place of Presentation
      東京 弁護士会館
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] 裁判員のネガティブ感情と事実認定判断(2)

    • Author(s)
      伊東裕司
    • Organizer
      日弁連刑事弁護センター 第1回供述分析研究会
    • Place of Presentation
      東京 弁護士会館
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] 正確さに対する動機づけと認知欲求レベルが裁判員の判断に及ぼす影響

    • Author(s)
      松尾加代
    • Organizer
      法と心理学会第13回大会
    • Place of Presentation
      武蔵野美術大学
    • Related Report
      2012 Annual Research Report
  • [Presentation] 模擬裁判員の認知欲求レベルによる事実認定判断と感情喚起の違い

    • Author(s)
      松尾加代
    • Organizer
      第2回日本情動学会大会.
    • Place of Presentation
      慶應義塾大学
    • Related Report
      2012 Annual Research Report

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Published: 2011-04-06   Modified: 2019-07-29  

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