• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Cognitive and social influences on lay judges' decision processes

Planned Research

Project AreaLaw and Human Behavior
Project/Area Number 23101008
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Humanities and Social Sciences
Research InstitutionKeio University

Principal Investigator

Itoh Yuji  慶應義塾大学, 文学部, 教授 (70151545)

Co-Investigator(Renkei-kenkyūsha) FUCHINO Takao  立命館大学, 法務研究科, 教授 (20271851)
MURAYAMA Aya  近畿大学, 国際学部, 特任講師 (10609936)
Research Collaborator MATSUO Kayo  慶應義塾大学, 先導研究センター, 研究員
HINE Kyoko  理科学研究所, 研究員
MIURA Hiroshi  慶應義塾大学, 先導研究センター, 研究員
Project Period (FY) 2011-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥21,840,000 (Direct Cost: ¥16,800,000、Indirect Cost: ¥5,040,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2012: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2011: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Keywords裁判員制度 / 事実認定 / 感情 / 被害者の意見陳述 / 説示 / 裁判員裁判 / 模擬裁判員実験 / 生理指標 / 模擬裁判実験 / 裁判員 / 判断バイアス / 模擬評議 / 情動
Outline of Final Research Achievements

We examined the influences of inflammatory information in courts on lay judges' verdict decisions with a series of mock lay judge experiments. Inflammatory information such as victim's family's statements of opinion or photographs of dead bodies made the mock lay judges' negative emotions stronger and increased guilty verdicts. However, for mock lay judges with high need for cognition, inflammatory information did not elicit negative emotions nor increase guilty verdicts. Careful legal instructions, pressure for rational decision, and enough thinking time seemed to remove the influences of inflammatory information in courts. However, our data suggested the possibilities that pressure for rational thinking caused irrational judgments or excessive suppression of negative emotions. More psychological experiments are required for the reexamination on Japanese lay judge system and its proper applications.

Report

(6 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Annual Research Report
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (23 results)

All 2016 2015 2014 2012 2011 Other

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (16 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Book (1 results)

  • [Journal Article] The effect of suggestibility on eyewitness identifications: A comparison between showups and lineups2016

    • Author(s)
      三浦大志・ 伊東裕司
    • Journal Title

      The Japanese journal of psychology

      Volume: 87 Issue: 1 Pages: 32-39

    • DOI

      10.4992/jjpsy.87.14073

    • NAID

      130005147560

    • ISSN
      0021-5236, 1884-1082
    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of emotional testimony and gruesome photographs on mock jurors’ decisions and negative emotions2015

    • Author(s)
      Matsuo, K. and Itoh, Y.
    • Journal Title

      Psychiatry, Psychology and Law

      Volume: 23 Issue: 1 Pages: 85-101

    • DOI

      10.1080/13218719.2015.1032954

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 被害者の意見陳述は裁判員の事実認定に影響を与えるか?2015

    • Author(s)
      伊東裕司
    • Journal Title

      法と心理

      Volume: 15 Pages: 10-15

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 直前の課題が再認判断に及ぼす影響 -リベレーション効果の分類と挿入効果の解明に向けて-2014

    • Author(s)
      三浦大志・伊東裕司
    • Journal Title

      心理学評論

      Volume: 57 Pages: 511-528

    • NAID

      130007404470

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Carryover Effects in Face Recognition: Processing Mode or Attentional Window?2014

    • Author(s)
      Hine, K. and Itoh, Y.
    • Journal Title

      Journal of Cognitive Psychology, 26, 98-109

      Volume: 26 (1) Issue: 1 Pages: 98-109

    • DOI

      10.1080/20445911.2013.845193

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of frustration and temporal distance on altruistic behavior2011

    • Author(s)
      Matsuo, K.
    • Journal Title

      慶應義塾大学大学院社会学研究科紀要

      Volume: 71 Pages: 65-80

    • NAID

      120005255669

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Presentation] Effects of emotional materials on lay judges' fact-findings2016

    • Author(s)
      Itoh, Y.
    • Organizer
      31st International Congress of Psychology
    • Place of Presentation
      パシフィコ横浜(神奈川県横浜市)
    • Year and Date
      2016-07-24
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 人間の判断と合理性2015

    • Author(s)
      伊東裕司
    • Organizer
      法と心理学会
    • Place of Presentation
      獨協大学(埼玉県草加市)
    • Year and Date
      2015-10-24
    • Related Report
      2015 Annual Research Report
  • [Presentation] 裁判員裁判における事実認定判断に影響を及ぼす要因の検討2015

    • Author(s)
      松尾加代
    • Organizer
      公開シンポジウム「論理と感性の新たな学際研究に向けて」
    • Place of Presentation
      慶應義塾大学・東京都港区
    • Year and Date
      2015-02-01
    • Related Report
      2014 Annual Research Report
  • [Presentation] 被害者の意見陳述は裁判員の事実認定に影響を与えるか?2014

    • Author(s)
      伊東裕司
    • Organizer
      法と心理学会第15回大会
    • Place of Presentation
      関西学院大学・兵庫県西宮市
    • Year and Date
      2014-10-25 – 2014-10-26
    • Related Report
      2014 Annual Research Report
  • [Presentation] 審理からの時間経過が模擬裁判員の感情と判断に及ぼす影響2014

    • Author(s)
      伊東裕司
    • Organizer
      法と心理学会第15回大会
    • Place of Presentation
      関西学院大学・兵庫県西宮市
    • Year and Date
      2014-10-25 – 2014-10-26
    • Related Report
      2014 Annual Research Report
  • [Presentation] 情報処理方略が模擬裁判員の判断および記憶に及ぼす影響:統制的処理は記憶を促進するか2014

    • Author(s)
      松尾加代・伊東裕司・三浦大志
    • Organizer
      法と心理学会第15回大会
    • Place of Presentation
      関西学院大学・兵庫県西宮市
    • Year and Date
      2014-10-25 – 2014-10-26
    • Related Report
      2014 Annual Research Report
  • [Presentation] ニオイの再認記憶における言語隠蔽効果2014

    • Author(s)
      伊東裕司
    • Organizer
      日本認知心理学会第12回大会
    • Place of Presentation
      仙台国際センター・宮城県仙台市
    • Year and Date
      2014-06-28 – 2014-06-29
    • Related Report
      2014 Annual 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 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
      2012 Annual Research Report
    • Invited
  • [Presentation] 恐怖感情の除去が想起に及ぼす影響2012

    • Author(s)
      伊東裕司
    • Organizer
      日本認知心理学会第10回大会
    • Place of Presentation
      岡山大学
    • Year and Date
      2012-06-03
    • Related Report
      2012 Annual Research Report
  • [Presentation] リベレーション効果のメカニズム:メタ認知が引き起こす基準のシフト2012

    • Author(s)
      三浦大志
    • Organizer
      日本認知心理学会第10回大会
    • Place of Presentation
      岡山大学
    • Year and Date
      2012-06-02
    • Related Report
      2012 Annual 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] Individual differences in guiltiness decision and sentencing2011

    • Author(s)
      Itoh, Y.
    • Organizer
      16th World Congress of the International Society for Criminology
    • Place of Presentation
      神戸
    • Year and Date
      2011-08-08
    • Related Report
      2011 Annual Research Report
  • [Presentation] The automatic activation of retributive motive indetermination of punishment2011

    • Author(s)
      Watamura, E.
    • Organizer
      The 9th Biennial Meeting of the Society for Applied Research in Memory and Cognition
    • Place of Presentation
      New York
    • Year and Date
      2011-06-27
    • Related Report
      2011 Annual Research Report
  • [Presentation] 事前の思い込みがラインナップ手続きと単独面通し手続きに及ぼす影響の比較2011

    • Author(s)
      三浦大志
    • Organizer
      日本認知心理学会第9回大会
    • Place of Presentation
      学習院大学(東京)
    • Year and Date
      2011-05-28
    • Related Report
      2011 Annual Research Report
  • [Presentation] 裁判員の怒り感情と有罪無罪判断:二重過程理論からの検討

    • Author(s)
      松尾加代
    • Organizer
      日本心理学会第77回大会
    • Place of Presentation
      札幌コンベンションセンター(北海道)
    • Related Report
      2013 Annual Research Report
  • [Presentation] 模擬裁判員の同情と怒りの喚起が事実認定に及ぼす影響

    • Author(s)
      松尾加代
    • Organizer
      法と心理学会第14回大会
    • Place of Presentation
      九州大学(福岡県)
    • Related Report
      2013 Annual Research Report
  • [Book] Two modes of processing in visual memory, category learning, and judicial judgment. In Logic and Sensibility(S.Watanabe (Ed.))2012

    • Author(s)
      Itoh, Y.
    • Publisher
      Keio University
    • Related Report
      2011 Annual Research Report

URL: 

Published: 2011-08-01   Modified: 2019-07-29  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi