About Hiro

Hiro is an associate professor at Royal Holloway, University of London, and a visiting associate professor at the Research Institute for Future Design at the Kochi University of Technology. He earned a PhD from the University of Kent in 2022 (PhD supervisors: Prof. Tim Hopthrow, Prof. Dominic Abrams, and Dr. Jim Everett).

His academic interests lie in social and evolutionary psychology and he is interested in understanding cooperation, in particular, in intergroup contexts. He has been undertaking a wide range of projects and he addresses questions such as how indirect reciprocity guides (intergroup) cooperation, why people gossip and how it facilitates prosociality within/across group boundaries, and how we can promote intergenerational and post-disaster cooperation.

He likes talking and doing nonsense with his friends and he also enjoys playing jazz. When he was younger, he traveled abroad by himself with his trumpet and hit local jam sessions in many countries. He currently plays for the Runnymede Jazz Orchestra and a regular participant of the Woods Shed Jazz Club.

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What’s on

Sep 22 2026
Stevie Wonder Night Hersham Music Club · 21:30

Recent papers

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*Xiao, Q., & Imada, H. (2026). The co-occurrence of ingroup and outgroup prosociality requires cross-group partner choice. Proceedings of the National Academy of Sciences, 123(24), e2606967123. https://doi.org/10.1073/pnas.2606967123 View →
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*Tateishi, W., & *Imada, H. (2026). Social norms and group-bounded indirect reciprocity. Evolutionary Human Sciences, 8, e13. https://doi.org/10.1017/ehs.2026.10045 View →
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*Takei, M., Moon, C., & Imada, H. (2026). Audience costs in the eyes of an adversary. Research & Politics, 13(1), 20531680261428603. https://doi.org/10.1177/20531680261428603 View →
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*Fan, L., Molho, C., Imada, H., Tybur, J. M., & van Leeuwen, F. (2025). Anger, disgust, and their link to aggressive punishments in the East: Testing the socio-functional account of condemning moral emotions in Japan. Cognition and Emotion. https://doi.org/10.1080/02699931.2025.2572709 View →
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*Gligorić, V., Jost, J. T., Pezzia, A. E., Balabanova, A., Carlevari, A. V., Lazar, A., Kende, A., … Imada, H., … Khosrowtaj, Z. (2025). Macro-economic inequality and national stereotypes in 45 non-Western countries. Social Psychological and Personality Science. 19485506251370424. https://doi.org/10.1177/19485506251370424 View →
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*Takahashi, R., Imada, H., & Mifune, N. Cross-temporal replication of the relationship between SDO and political attitudes in Japan: SDO and attitudes shifted but the relationship holds. (2025). The Journal of Social and Political Psychology, 13(2), 210-222. https://doi.org/10.5964/jspp.16589 View →

Cooperation and Intergroup Processes Lab (CIP Lab)

Hiro leads the Cooperation and Intergroup Processes Lab (CIP Lab) and is recruiting undergraduate, postgraduate, and postdoctoral researchers. Visit the lab page to read about the team, current projects, recent papers, and how to join.

Visit the CIP Lab →