Itoh, Yuji

写真a

Affiliation

Faculty of Letters (Mita)

Position

Professor Emeritus

External Links
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Career 【 Display / hide 】

  • 1982.04
    -
    1988.03

    大学助手(文学部)

  • 1988.04
    -
    1992.03

    大学専任講師(文学部)

  • 1991.10
    -
    1993.09

    大学通信教育部学生部副部長

  • 1992.04
    -
    2000.03

    大学助教授(文学部)

  • 1993.10
    -
    1995.09

    大学通信教育部学習指導主任

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Academic Background 【 Display / hide 】

  • 1977.03

    Keio University, Faculty of Literature

    University, Graduated

  • 1979.03

    Keio University, Graduate School, Division of Sociology

    Graduate School, Completed, Master's course

  • 1982.03

    Keio University, Graduate School, Division of Sociology

    Graduate School, Withdrawal after completion of doctoral course requirements, Doctoral course

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Academic Degrees 【 Display / hide 】

  • Ph.D in Psychology, Keio University, Dissertation, 2005.02

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Research Areas 【 Display / hide 】

  • Humanities & Social Sciences / Experimental psychology (Experimental Psychology)

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Research Themes 【 Display / hide 】

  • Verbal overshadowing effect in face memory: analysis of conditions and mechanisms, 

    2006
    -
    2008

  • Memory conformity effect in eyewitnesses: Examination using MORI technique, 

    2004
    -
    2007

  • Indivisual differences in lay judges' decision: Relation with need for cognition, 

    2006
    -
    2008

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Books 【 Display / hide 】

  • Memory and Society: Psychological perspective

    ITOH YUJI, London, New York: Psychology Press, 2006

    Scope: 159-169

  • 目撃者の心理学

    S. L. Sporer, R. S. Malpass, and G. Koehnken, ブレーン出版, 2003

  • 日常認知の心理学

    伊東　裕司, 北大路書房, 2002

    Scope: 88-106

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Papers 【 Display / hide 】

  • A field experiment demonstrating person misidentification at an appointed meeting place

    Miura H., Shimane D., Itoh Y.

    Applied Cognitive Psychology 38 ( 3 )  2024.05

    ISSN  08884080

    　View Summary

    Mistaking a person for another sometimes occurs; however, few studies have examined it experimentally. Therefore, the reasons behind this kind of person misidentification and its occurrence rate remain unclear, and thus we aimed to demonstrate person misidentification occurs with a certain probability through a field experiment. We also sought to examine whether the similarity between two people affects the occurrence of person misidentification. When 66 undergraduate participants made a rendezvous with an acquaintance, another person who wore similar clothes to the acquaintance or had a similar face appeared. The results showed that in both the conditions, approximately half of the participants made the person misidentification error, and one-fourth even spoke to the person mistakenly. Moreover, the results indicated that clothing contributed to person misidentification just as much as the face at first sight but became less important over time. This suggests a dynamic shift in person identification depending on time.

  • Victim impact statement and lay judges’ decision making: exploring cross-cultural and individual differences in East Asia

    Huang K.J., Teoh Y.S., Itoh Y.

    Psychology, Crime and Law 30 ( 10 ) 1292 - 1312 2024

    ISSN  1068316X

    　View Summary

    Research has shown that emotional testimony given by victims or their family can affect jurors’ or lay judges’ decision-making processes, but little attention has been paid to cross-cultural and individual variations. The present study examined whether cultural and individual differences were associated with how victim impact statement (VIS) affected mock lay judges’ decision making in East Asian contexts. Participants from Japan (n = 74) and Taiwan (n = 64) reviewed a transcript of a lay participation (or Saiban-In) trial with or without an emotional VIS by the bereaved family and then made verdict and sentencing decisions individually. The results showed no main and interaction effects of VIS and culture on verdict decision, perceived strength of evidence, and sentence decision. Regression analyses showed that Need for Affect predicted higher perceived strength of evidence against the defendant and more guilty verdicts, and the effects were stronger in the VIS condition. We concluded that emotional VIS in a written format may not be biasing by nature in East Asian contexts; however, including a VIS could risk the possibility of bias in the fact-finding process of lay judges with a higher tendency to approach emotional information.

  • Familiarity with non-famous faces increases “person misidentification”

    Shimane D., Miura H., Itoh Y.

    Quarterly Journal of Experimental Psychology  2024

    ISSN  17470218

    　View Summary

    People sometimes mistakenly identify an unknown person they encounter as a known person. Previous studies have elucidated this phenomenon and revealed that it is a common experience. However, no experimental study has identified factors associated with its occurrence. We termed this relatively under-examined phenomenon as “person misidentification” and examined its factors. Specifically, we focused on (1) establishing experimental procedures to detect person misidentification in a laboratory context and (2) investigating the mechanism by which visual familiarity with the encountered unknown faces contributes to person misidentification. The results indicated that the developed procedure measured 247 misidentifications in 72 of 106 participants in all experiments. Although the effect of familiarity on person misidentification was not observed in Experiment 1, this effect was detected in Experiment 2, where the manipulation of familiarity was enhanced and confirmed. Concretely, unknown faces with familiarity enhanced by subliminal exposure were more frequently misidentified as another known person. This indicates that familiarity with an encountered face contributes to and induces person misidentification. In addition, the results demonstrated that similarities, especially in terms of hairstyle, between the encountered face and the misidentified known person might be related to its occurrence. These results have rich implications and expand the literature on face processing.

  • A descriptive study on misidentifications of a person as a familiar person in an everyday situation

    Itoh Y., Miura H., Shimane D.

    Scientific Reports 13 ( 1 )  2023.12

    　View Summary

    The purpose of this study is to show the characteristics of person misidentifications, that is, experiences in which persons are misidentified as known persons. A total of 121 participants were asked how many times they misidentified persons in the last year and details of a recent person misidentification were recorded through a traditional questionnaire. Additionally, they answered questions in a diary method questionnaire, about the details of person misidentification each time they experienced it, during the two-week survey period. The questionnaires revealed that the participants misidentified both known and unknown persons as familiar persons approximately six (traditional questionnaire) or 19 (diary method) times a year on average, regardless of whether they expected the persons to be there. They were more likely to misidentify a person as a familiar than as a less familiar person. It was also shown that the similarity of the faces of the person actually seen and the person they were mistaken for was not as high as the similarities of build and clothing. This study is expected to provide suggestions for models of person identification and enhance the research on errors.

  • A Motor Task, Not Working Memory, Causes the Revelation Effect

    Miura H., Itoh Y.

    Canadian Journal of Experimental Psychology 78 ( 2 ) 81 - 87 2023.11

    ISSN  11961961

    　View Summary

    Performing a cognitive task prior to making a recognition judgment increases the probability of old responses, which is known as the revelation effect. The criterion shift account (Niewiadomski & Hockley, 2001) proposes that occupation of working memory causes the revelation effect. However, we proposed that working memory does not cause it. Two experiments were conducted to disconfirm the relationship between working memory and the revelation effect and to consider an alternative explanation that metacognition causes the effect. In Experiment 1, the revelation effect was caused by a finger movement task, which puts little or no load on working memory. In Experiment 2, a metacognitive instruction that a cognitive task would make subsequent recognition easier induced a conservative criterion shift. The finding that a simple motor task caused the revelation effect in Experiment 1 disconfirms the relationship between working memory and the revelation effect and extends the boundaries of the occurrence of the effect. The findings in Experiment 2 suggest that metacognition may be related to the occurrence of the revelation effect. This study implies a paradoxical aspect of human cognition in that metacognition, which usually makes cognition more effective and rational, may also cause an irrational phenomenon, the revelation effect.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Presentations 【 Display / hide 】

  • 心理学における実証的研究とガイドライン

    伊東　裕司

    法と心理学会第4回大会 (東北大学（仙台）) , 

    2003.10
    , 

    法と心理学会

  • 話し合い，および同調に対する注意が目撃者の記憶に与える影響

    伊東　裕司

    法と心理学会第4回大会 (東北大学（仙台）) , 

    2003.10
    , 

    法と心理学会

  • 証拠の採用・不採用が他の証拠の理解・判決に及ぼす影響

    山崎優子・伊東裕司

    法と心理学会第4回大会 (東北大学（仙台）) , 

    2003.10
    , 

    法と心理学会

  • 情動的ストレスが記憶に及ぼす影響：空間的中心性と内容的中心性

    伊東裕司・佐山玲子

    第1回日本認知心理学会大会 (日本大学（東京）) , 

    2003.06
    , 

    日本認知心理学会

  • 組み合わせ情報の記憶における注意分割の効果

    村瀬周子・伊東裕司

    第1回日本認知心理学会大会 (日本大学（東京）) , 

    2003.06
    , 

    日本認知心理学会

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 視覚情報による人違い現象の解明：人違いの心理学の創生に向けて

    2018.06
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory) , Principal investigator

  • 司法手続きにおける確証バイアスの解明と克服方法の検討：法学・心理学の学際的研究

    2017.04
    -
    2020.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

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Courses Taught 【 Display / hide 】

  • SPECIAL STUDIES IN EXPERIMENTAL PSYCHOLOGY 4

    2021

  • FORENSIC PSYCHOLOGY

    2021

  • FORENSIC AND CRIMINAL PSYCHOLOGY

    2021

  • EXPERIMENT:ADVANCED STUDY OF PSYCHOLOGY 4

    2021

  • SEMINAR IN COGNITIVE PSYCHOLOGY 2

    2020

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Memberships in Academic Societies 【 Display / hide 】

  • The Society for Applied Research in Memory and Cognition, 

    2004
    -
    Present

  • The Japanese Society for Cognitive Psychology, 

    2003
    -
    Present

  • Japanese Society for Law and Psychology, 

    2000
    -
    Present

  • The Japanese Psychological Association, 

    1977
    -
    Present
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Committee Experiences 【 Display / hide 】

  • 2004
    -
    Present

    Member, The Society for Applied Research in Memory and Cognition

  • 2003
    -
    Present

    Director, The Japanese Society for Cognitive Psychology

  • 2000
    -
    Present

    Editor, Japanese Society for Law and Psychology

  • 1977
    -
    Present

    Member, The Japanese Psychological Association

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