Faculty of Letters, Arts and Sciences, School of Humanities and Social Sciences

Job title

Assistant Professor(without tenure)

Homepage URL

Degree 【 display / non-display

  • 2014.03   学習院大学   学士 (心理学)

  • 2016.03   早稲田大学   修士 (文学)

  • 2020.07   早稲田大学   博士 (文学)


Research Areas 【 display / non-display

  • Social psychology   パーソナリティ心理学

  • Educational psychology   パーソナリティ心理学

  • Clinical psychology   パーソナリティ心理学

Research Interests 【 display / non-display

  • 心理尺度

  • 個人差

  • 性格

  • 性格心理学

  • 人格心理学

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Papers 【 display / non-display

  • The association between personality traits and hoarding behavior during the COVID-19 pandemic in Japan.

    Shinya Yoshino, Tadahiro Shimotsukasa, Yasuhiro Hashimoto, Atsushi Oshio

    Personality and individual differences   179   110927 - 110927  2021.09  [International journal]

     View Summary

    The purpose of this study was to investigate the relationship between personality traits and hoarding behavior during the coronavirus disease (COVID-19) pandemic. An online survey was conducted among 530 Japanese adults (274 women; M age = 44.26, SD age = 8.43) who were living in Tokyo when a state of emergency was declared. Personality traits were assessed using measures of the Big Five personality traits and dispositional greed. They also responded to measures of tendencies to hoard essential and countermeasure products during the COVID-19 pandemic. Correlation analysis revealed that Extraversion, Neuroticism, Openness, and dispositional greed were positively associated with hoarding behavior. Multiple regression analysis revealed that individuals with high Agreeableness, Neuroticism, Openness, and dispositional greed tended to hoard products. The present findings suggest that personality traits account for behavioral responses to the COVID-19 pandemic in Japan. The emergent relationship between hoarding behavior and each personality trait is discussed in relation to the existing literature.

    DOI PubMed

  • Cross-Sectional Age Differences in the Dark Triad Traits in Two Japanese Samples

    Tetsuya Kawamoto, Tadahiro Shimotsukasa, Atsushi Oshio

    PSYCHOLOGY AND AGING   35 ( 1 ) 91 - 96  2020.02  [Refereed]

     View Summary

    This study investigated the age differences in the Dark Triad (DT) traits with 2 independent samples. Personality was measured using the Short Dark Triad and the Dark Triad Ditty Dozen. Results showed a significant negative correlation between age and DT traits except for narcissism, which differed between the samples. Significant age-by-sex interaction effects were observed for Macitiavellianism and the DT composite score, indicating that women showed a steeper downward age trend in dark personalities.


  • Dark Triadと向社会性:向社会的な社会に向けて

    下司忠大, 小塩真司

    心理学評論   63 ( 4 ) 422 - 432  2020  [Refereed]

    Authorship:Lead author

  • Development and Validation of a General Group Identification Tendency Scale

    Matsuki Yuma, Shimotsukasa Tadahiro

    The Japanese Journal of Personality   29 ( 2 ) 47 - 49  2020  [Refereed]

     View Summary

    <p>The purpose of this study is to develop the General Group Identification Tendency (GGIT) scale that measures individual tendency to identify with ingroups regardless of the type of group and examine its reliability and validity. Results of questionnaire surveys that were conducted with university students showed sufficient internal consistency and validity, which was estimated in terms of the relationship with contextualism, degree of identification with the university, collective self-esteem, and allocentric tendency. These results indicated that the GGIT scale is valid.</p>

    DOI CiNii

  • Sunshine Duration and Personality Traits:Regional Differences of Extraversion and Neuroticism in Japan

    Yoshino Shinya, Shimotsukasa Tadahiro, Oshio Atsushi

    The Japanese Journal of Personality   28 ( 3 ) 256 - 259  2020  [Refereed]

     View Summary

    <p>The present study examined the relationships of sunshine duration with extraversion and neuroticism. Previous studies suggested that individuals living in regions that receive little direct sunlight tend to experience depression and lack of sleep, which are associated with particular personality traits. Moreover, they are associated with increases in the amount of serotonin with longer daylight durations. We used a Japanese dataset including 18,922 adults (9,227 females; mean age: 47.74) and conducted a prefecture-level analysis. Results of multiple regression analysis indicated that neuroticism was negatively associated with sunshine duration while extraversion was not. The results showed that sunshine duration may explain the variance of regional differences in personality traits.</p>

    DOI CiNii

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Books and Other Publications 【 display / non-display

  • たのしいベイズモデリングーー事例で拓く研究のフロンティアーー

    豊田 秀樹, 下司 忠大, 清水 裕士, 平川 真, 鈴木 朋子, 坂本 次郎, 小杉 孝司, 武藤 拓之, 紀ノ定 保礼, 岡田 謙介, 徳岡 大, 難波 修史, 後藤 崇志, 国里 愛彦, 井上 和哉, 鬼田 崇作, 草薙 邦広, 竹林 由武, 仙取 恵太, 北條 大樹( Part: Contributor, 第2章 血液型と性格には関連がある?──ベイズ的アプローチによる再分析──, pp13-20))

    北大路書房  2018.09 ISBN: 9784762830402

Misc 【 display / non-display

Other 【 display / non-display

  • 2016-2018年度 早稲田大学大学院博士後期課程若手研究者養成奨学金 採用

Awards 【 display / non-display

  • 奨励賞

    2020.08   日本パーソナリティ心理学会   日照時間とパーソナリティ-外向性と神経症傾向の地域差に注目して-

    Winner: 吉野伸哉 下司忠大 小塩真司

  • 奨励賞

    2019.08   日本パーソナリティ心理学会   サディズムとスポーツにおける競技成績との関連―駆け引き上手を媒介変数として―

    Winner: 下司忠大, 陶山智, 小塩真司, 大束忠司

  • s

    2018.03   Society for Tokyo Young Psychologists (STYP)  

    Winner: Tadahiro Shimotsukasa

Research Projects 【 display / non-display

  • 日米間におけるダークパーソナリティ特性の文化的等価性の検討


    Project Year :


    下司 忠大

  • 高ダークパーソナリティ傾向者の非道徳的社会化プロセスの検討

    Project Year :


    下司 忠大

    Authorship: Principal investigator

Presentations 【 display / non-display

  • 日常社会の中のパーソナリティ特性

    小塩真司, 下司忠大, 吉野伸哉, 西田裕紀子, 髙橋雄介, 谷伊織


    Presentation date: 2020.10

    Event date:
  • パーソナリティ尺度構成の現在 ―多様な尺度構成の現場から― (日本パーソナリティ心理学会第27回大会準備委員会企画シンポジウム)

    川本 静香, 小塩 真司, 橋本 泰央, 下司 忠大, 外山 美樹, 箕浦 有希久, 稲垣 勉, 村井 潤一郎


    Presentation date: 2018.09

  • Dark Triadによるゴミのポイ捨て行動の予測 (口頭発表)

    下司 忠大, 吉野 伸哉, 小塩 真司


    Presentation date: 2018.09

  • 個人内過程および対人関係におけるDark Triadの諸相 (自主企画シンポジウム)

    喜入 暁, 下司 忠大, 田村 紋女, 田崎 優里, 川本 哲也, 谷 伊織


    Presentation date: 2018.09

  • Dark Triadと対人関係――「ダークな人」の戦略性・適応性―― (自主企画シンポジウム)

    下司 忠大, 増井 啓太, 田村 紋女, 喜入 暁, 川本 哲也, 阿部 晋吾


    Presentation date: 2017.09

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Syllabus 【 display / non-display

Teaching Experience 【 display / non-display

  • 心理学調査実習


  • パソコン応用


  • 心理学I


  • 行動心理学入門


  • 実験心理学入門


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Committee Memberships 【 display / non-display

  • 2020.09

    日本パーソナリティ心理学会  広報委員会 委員

  • 2020.09

    日本パーソナリティ心理学会  機関紙編集委員会 委員

  • 2018.02

    日本パーソナリティ心理学会  ヤングサイコロジストプログラム 企画担当代表

  • 2016.02

    日本パーソナリティ心理学会  ヤングサイコロジストプログラム 企画担当

Social Activities 【 display / non-display

  • 高等部講義 - 先輩の授業 -「心理学入門」

    埼玉平成高等学校 (中高一貫コース)