Basic Information

Email Address

• Email Address

  iki.sakumi.5xkyoto-u.ac.jp

Professional Memberships

• To Present

  日本動物心理学会
• To Present

  日本認知科学会
• To Present

  日本霊長類学会

Academic Degree

• 22 Mar. 2018

  東京大学修士（学術）
• 24 Mar. 2022

  総合研究大学院大学博士（理学）

Academic Resume (Undergraduate School/Majors)

• 東京大学, 工学部システム創成学科, 卒業

Research History

• From Apr. 2025, To Present

  京都大学 白眉センター/ヒト行動進化研究センター, 特定助教
• From Apr. 2025, To Present

  Aichi University, 非常勤講師
• From Apr. 2022, To Mar. 2025

  京都大学ヒト行動進化研究センター, 特定研究員（日本学術振興会特別研究員PD）

ID,URL

• ORCID ID

  0000-0003-4863-4179

• J-Global ID

  202201000634502913

• Researcher number

  90971218

researchmap URL

• https://researchmap.jp/sakumi_iki

Research

Papers

• Monkeys increase scratching when encountering unexpected good fortune

  Sakumi Iki; Ikuma Adachi

  Scientific Reports, 11 Mar. 2025, Peer-reviewed, Lead author, Corresponding author

  Access this paper :

  
• From curiosity to play: re‐evaluating the evolutionary origins of play (read-only version: https://onlinelibrary.wiley.com/share/author/TKUGAMVTM76UPXY4ECRU?target=10.1111/brv.70009)

  Sakumi Iki

  Biological Reviews, 05 Mar. 2025, Peer-reviewed, Lead author, Corresponding author

  Access this paper :

  
• Affective bodily responses in monkeys predict subsequent pessimism, but not vice versa

  Sakumi Iki; Ikuma Adachi

  Proceedings of the Royal Society B: Biological Sciences, 05 Feb. 2025, Peer-reviewed, Lead author, Corresponding author

  Access this paper :

  
• How to ʻplay togetherʼ: the opening and closing phases of play fighting in Japanese macaques

  Sakumi IKI

  Primate Research, Dec. 2024, Peer-reviewed, Invited, Lead author, Corresponding author

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• Fearful snake pictures make monkeys pessimistic

  Sakumi Iki; Ikuma Adachi

  iScience, Aug. 2023, Peer-reviewed, Lead author, Corresponding author

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• Play face in Japanese macaques reflects the sender’s play motivation

  Sakumi Iki; Nobuyuki Kutsukake

  Animal Cognition, Jun. 2023, Peer-reviewed, Lead author, Corresponding author

  Access this paper :

  
• Victims of Play Escalation Rank Below Aggressors in Japanese Macaques (Macaca fuscata)

  Sakumi Iki; Nobuyuki Kutsukake

  INTERNATIONAL JOURNAL OF PRIMATOLOGY, Jun. 2022, Peer-reviewed, Lead author, Corresponding author

  
• Face-to-face configuration in Japanese macaques functions as a platform to establish mutual engagement in social play.

  Sakumi Iki; Toshikazu Hasegawa

  Animal cognition, Nov. 2021, Peer-reviewed, Lead author, Corresponding author

  
• Japanese macaques relax vigilance when surrounded by kin

  Sakumi Iki; Nobuyuki Kutsukake

  ANIMAL BEHAVIOUR, Sep. 2021, Peer-reviewed, Lead author, Corresponding author

  
• Social bias affects vigilance contagion in Japanese macaques

  Sakumi Iki; Nobuyuki Kutsukake

  ANIMAL BEHAVIOUR, Aug. 2021, Peer-reviewed, Lead author, Corresponding author

  
• Face-to-face opening phase in Japanese macaques' social play enhances and sustains participants' engagement in subsequent play interaction.

  Sakumi Iki; Toshikazu Hasegawa

  Animal cognition, Jan. 2020, Peer-reviewed, Lead author, Corresponding author

  
• ニホンザルの闘争遊びにおける行動協調メカニズムの検討

  壹岐朔巳; 長谷川寿一

  認知科学, 2019, Invited, Lead author

  

Misc.

• ニホンザルの闘争遊び:インタラクションの非対称性は文脈に基づいて調整される

  壹岐朔巳; 長谷川寿一

  霊長類研究, 2018

  
• Perceptual Alternation Induced in the Act of Rotating and Observing a Wireframe Object

  壹岐朔巳; 大澤理恵; 今福翔太; 白山晋

  電子情報通信学会技術研究報告, 2016

  

Books and Other Publications

• The encyclopedia of primatology

  日本霊長類学会, Contributor, 攻撃, 敵対的行動

  丸善出版, Jul. 2023

  Find Kyoto University's collection of books :

  
• 愛犬家の動物行動学者が教えてくれた秘密の話

  Bekoff, Marc; 森, ゆみ, Others, 監訳

  エクスナレッジ, Aug. 2019

  Find Kyoto University's collection of books :

  

Awards

• Apr. 2025

  京都大学, 京都大学白眉研究者

  Others
• Oct. 2024

  日本動物心理学会, 日本動物心理学会 第84回大会 優秀発表奨励賞

  Does self-scratching predict pessimistic cognitive biases in Japanese macaques? Revisiting the James-Lange theory

  Sakumi Iki
• Jul. 2023

  日本霊長類学会, 2023年度日本霊長類学会高島賞（第32回学術奨励賞）

  地獄谷野猿公苑のニホンザルにおける社会的な遊び等の研究, Japan society
• Mar. 2022

  総合研究大学院大学, 先導科学研究科研究科長賞

  Others
• Sep. 2021

  ANIMAL BEHAVIOUR, September 2021 Editors' Choices

  Official journal

  Sakumi Iki, Nobuyuki Kutsukake
• Dec. 2018

  日本認知科学会, 日本認知科学会第35回大会大会発表賞

  Japan society
• Mar. 2018

  東京大学, 広域科学専攻奨励賞

  Others

External funds: Kakenhi

• 霊長類の好奇心と遊びを喚起する認知エンリッチメント用ビデオゲームの開発と効果測定

  Grant-in-Aid for Early-Career Scientists

  Basic Section 90030:Cognitive science-related

  Kyoto University

  壹岐 朔巳

  From 01 Apr. 2025, To 31 Mar. 2029, Granted

  認知エンリッチメント;好奇心;遊び;ビデオゲーム;比較認知科学

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25K21531/

Academic, Social Contribution

Committee Memberships

• From 2025, To Present

  庶務幹事（第19期）, 日本霊長類学会
• From 2024

  第84回日本動物心理学会大会準備委員会

Academic Contribution

• Behaviour (2026)

  Peer review

  
• 動物心理学研究 (2025)

  Peer review

  
• Folia Primatologica (2025)

  Peer review

  
• International Journal of Primatology (2025)

  Peer review

  
• Animal Behaviour (2024 × 2, 2025)

  Peer review

  
• Ecology and Evolution (2024)

  Peer review

  
• Scientific Reports (2023, 2025)

  Peer review

  
• Animal Cognition (2021, 2022)

  Peer review

  
• Journal of Ethology (2019)

  Peer review