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Confirmation bias in judicial procedures and method for overcoming: Interdisciplinary study of law and psychology

Research Project

Project/Area Number 17H02652
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

Itoh Yuji  慶應義塾大学, 文学部(三田), 教授 (70151545)

Co-Investigator(Kenkyū-buntansha) 厳島 行雄  日本大学, 文理学部, 教授 (20147698)
指宿 信  成城大学, 法学部, 教授 (70211753)
吉井 匡  香川大学, 法学部, 准教授 (20581507)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2017: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Keywords実験系心理学 / 刑事法学 / 確証バイアス / 目撃証言 / 映像バイアス / 裁判官・裁判員の心象形成 / 認知バイアス / 確信度 / 取り調べ録画 / 裁判官(員)の心象形成 / 司法的判断 / 批判的思考 / 目撃記憶 / 裁判員 / 裁判官の心証形成 / メタ記憶
Outline of Final Research Achievements

From legal and psychological perspectives, we examined the possibility that the presentation of inappropriate information, such as the video of interrogation of a suspect in a court or the feedback of an investigator to an eyewitness, causes the judges, lay-judges
(saiban-in), investigators, or witnesses to have strong hypotheses and to distort (to bias) their memories, their judgments, or decisions of the court in investigations and trials. We also clarified the factors that influence the effects of these information presentations, showed methods to prevent bias, and examined the legal validity of the methods.

Academic Significance and Societal Importance of the Research Achievements

捜査や裁判は公平に行われる必要があるが、人間の思考の癖、すなわち確証バイアスをはじめとする認知バイアスは意図せずにこの公平性を脅かす。本研究では、これがどのような状況でどのような要因により生じるのかを具体的に明らかにし、それに対しどのような対策が可能であるのかを示した。これにより、捜査や裁判が適切に行われるために、制度やその運用をどうすればよいのかを示すことができた。また、心理学における人間の思考研究の応用の場を示し、そこからの基礎研究へのフィードバックの道筋を示した。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (31 results)

All 2020 2019 2018 2017

All Journal Article (12 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 1 results) Presentation (16 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results) Book (3 results)

  • [Journal Article] How do we judge our confidence? Differential effects of meta‐memory feedback on eyewitness accuracy and confidence2020

    • Author(s)
      Iida Ryosuke、Itsukusima Yukio、Mah Eric Y.
    • Journal Title

      Applied Cognitive Psychology

      Volume: 34 Issue: 2 Pages: 397-408

    • DOI

      10.1002/acp.3625

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 治療的司法からみた大麻事犯者2020

    • Author(s)
      指宿信
    • Journal Title

      精神科治療学

      Volume: 35 Pages: 67-71

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Dark Side of Visual Recording in the Suspect Interview: An Empirical and Experiential Study of the Unexpected Impact of Video Image2019

    • Author(s)
      Makoto Ibusuki
    • Journal Title

      International Journal for the Semiotics of Law

      Volume: 32 Issue: 4 Pages: 831-847

    • DOI

      10.1007/s11196-019-09645-0

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 録音・録画記録媒体の証拠としての許容性・範囲に関する多角的検討(3)取調べ録音録画媒体の実質証拠化とその規律 : 新たな証拠法則の提案2019

    • Author(s)
      指宿信
    • Journal Title

      判例時報

      Volume: 2416 Pages: 112-119

    • NAID

      40022028787

    • Related Report
      2019 Annual Research Report
  • [Journal Article] 治療的司法とは何か2019

    • Author(s)
      指宿信
    • Journal Title

      法と精神医療

      Volume: 34 Pages: 43-52

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Difference in motivation influences mock jurors’ decision and emotion; Effects of need for cognition and accountability2019

    • Author(s)
      Matsuo Kayo、Itoh Yuji
    • Journal Title

      Studies in sociology, psychology and education: Inquiries into humans and societies

      Volume: 87 Pages: 65-78

    • NAID

      120006980368

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 目撃者の記憶を歪めるフィードバック:識別後フィードバック効果研究とその展望2019

    • Author(s)
      福島 由衣・厳島 行雄
    • Journal Title

      心理学評論

      Volume: 61 Pages: 407-422

    • NAID

      130007808751

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 被暗示性尺度(GSS2j)における迎合と内向化の保持時間の影響2019

    • Author(s)
      花田捺実・厳島行雄
    • Journal Title

      日本大学心理学研究

      Volume: 40 Pages: 20-26

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 控訴審において無罪判決を破棄し、有罪自判することと、事実取調べ2018

    • Author(s)
      吉井匡
    • Journal Title

      季刊刑事弁護

      Volume: 96 Pages: 152-157

    • Related Report
      2018 Annual Research Report
  • [Journal Article] 裁判所における直接的侮辱行為に対する制裁と公正な裁判2018

    • Author(s)
      吉井匡
    • Journal Title

      刑法雑誌

      Volume: 57(2) Pages: 248-270

    • NAID

      40021541447

    • Related Report
      2017 Annual Research Report
  • [Journal Article] 岡崎事件最高裁判決を読む : その射程とインパクト2017

    • Author(s)
      指宿信
    • Journal Title

      季刊刑事弁護

      Volume: 90 Pages: 65-68

    • Related Report
      2017 Annual Research Report
  • [Journal Article] The Effects of Limiting Instructions about Emotional Evidence Depend on Need for Cognition2017

    • Author(s)
      Matsuo Kayo、Itoh Yuji
    • Journal Title

      Psychiatry, Psychology and Law

      Volume: 24 Issue: 4 Pages: 516-529

    • DOI

      10.1080/13218719.2016.1254588

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] The effects of other lay judges’ opinions given in the middle of trial on Japanese law judges’ judgment2019

    • Author(s)
      Itoh Yuji
    • Organizer
      Psychiatry, Psychology and Law: Collaboration and Challenges Across the Global South 2019 Joint Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 裁判員の有罪無罪判断を左右する心理的要因2019

    • Author(s)
      伊東裕司
    • Organizer
      日本科学哲学会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 裁判員の有罪無罪判断を左右する心理的要因2019

    • Author(s)
      伊東裕司
    • Organizer
      日本認知科学会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 裁判所で確証バイアスが生じうる一例について-わが国の裁判所における『直接侮辱』への対応-2019

    • Author(s)
      吉井匡
    • Organizer
      日本心理学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 内容か年齢か:高齢者の目撃証言の信頼性2019

    • Author(s)
      飯田諒介・厳島行雄
    • Organizer
      法と心理学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Confirmation bias in Japanese layjudges: The effects of intermittent deliberation2018

    • Author(s)
      Itoh, Y., Tokunaga, H., & Ujiie, H.
    • Organizer
      12st East Asian Association of Psychology and Law Annual Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Confirmation bias affects evaluations and judgements of lay judges2018

    • Author(s)
      Shimane, D., Matsuo, K., & Itoh, Y.
    • Organizer
      12st East Asian Association of Psychology and Law Annual Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Non-experts’ beliefs about eyewitness, police interview and expert testimony: A survey of college students2018

    • Author(s)
      Yui Fukushima, & Yukio Itsukushima
    • Organizer
      Association for Psychological Science
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 事前情報の有無による模擬裁判の量刑判断に及ぼす影響2018

    • Author(s)
      三上苑子・厳島行雄
    • Organizer
      第19回法と心理学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 詳細な情報を含む証言が確信度の一貫性に与える影響2018

    • Author(s)
      飯田涼介・厳島行雄
    • Organizer
      第19回法と心理学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 認知心理学を司法に活かす:記憶・感情・思考研究からのアプローチ2018

    • Author(s)
      伊東裕司
    • Organizer
      日本認知心理学会公開シンポジウム「認知心理学のフロンティアⅩ ~司法・医療への貢献~」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] The dark side of Visual Recording in the Suspect Interview: a study of the unexpected impact of video images and the legal regulation2018

    • Author(s)
      Ibusuki, M.
    • Organizer
      12st East Asian Association of Psychology and Law Annual Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 裁判所における直接的侮辱行為に対する制裁と公正な裁判2017

    • Author(s)
      吉井匡
    • Organizer
      日本刑法学会
    • Related Report
      2017 Annual Research Report
  • [Presentation] アリバイ供述の内容と提示方法が第3者の印象評価に及ぼす影響2017

    • Author(s)
      小林千也・厳島行雄
    • Organizer
      法と心理学会第18回大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] メタ記憶の操作が目撃証言に与える影響の検討2017

    • Author(s)
      飯田涼介・厳島行雄
    • Organizer
      法と心理学会第18回大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] メタ記憶の操作が目撃証言に与える影響の検討2017

    • Author(s)
      三上苑子・黒田浩司・厳島行雄
    • Organizer
      法と心理学会第18回大会
    • Related Report
      2017 Annual Research Report
  • [Book] 裁判員の判断の心理2019

    • Author(s)
      伊東 裕司
    • Total Pages
      106
    • Publisher
      慶應義塾大学出版会
    • ISBN
      9784766426052
    • Related Report
      2019 Annual Research Report
  • [Book] 法と心理学への招待2019

    • Author(s)
      サトウ タツヤ、若林 宏輔、指宿 信、松本 克美、廣井 亮一
    • Total Pages
      274
    • Publisher
      有斐閣
    • ISBN
      9784641174504
    • Related Report
      2019 Annual Research Report
  • [Book] シリーズ刑事司法を考える 第4巻2017

    • Author(s)
      指宿信、木谷明
    • Total Pages
      301
    • Publisher
      岩波書店
    • ISBN
      9784000265041
    • Related Report
      2017 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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