Interest
Evolution of Cooperation, Social Dilemma, Social Simulation, Agent-Based Modeling, Social Infomatics, Internet Sociology
Evolution of Cooperation, Social Dilemma, Social Simulation, Agent-Based Modeling, Social Infomatics, Internet Sociology
| Mar. 1995 | B. Eng., University of Electro-Communications | 
|---|---|
| Mar. 1997 | M. Eng., University of Electro-Communications | 
| Sep. 2003 | Ph. D., University of Electro-Communications | 
| Apr. 1997 | Mar. 2000 | The Japan Research Institute, Limited | 
|---|---|
| Apr. 2000 | Sep. 2003 | Research Associate, Faculty of Engineering, Tokyo University of Science | 
| Oct. 2003 | Mar. 2005 | Research Associate, Graduate School of Information Systems, University of Electro-Communications | 
| Apr. 2005 | Mar. 2009 | Lecturer, Faculty of Business Administration, Rissho University | 
| Apr. 2009 | Mar. 2014 | Associate Professor, Faculty of Business Administration, Rissho University | 
| Apr. 2014 | now | Professor, Faculty of Business Administration, Rissho University | 
Umetani, R., Yamamoto, H., & Akiyama, E. (2025) . Partner selection biases induced by resource inequality. Social Sciences & Humanities Open, 12, 101907. https://doi.org/10.1016/j.ssaho.2025.101907
Yamamoto, H., Okada, I., & Suzuki, T. (2025). Gradual reputation dynamics evolve and sustain cooperation in indirect reciprocity. PLoS One, 20(8), e0329742. https://doi.org/10.1371/journal.pone.0329742
Yamamoto, H., Okada, I., & Suzuki, T. (2025). Tolerant integrated reciprocity sustains cooperation in a noisy environment. Scientific Reports, 15(1), 28912. https://doi.org/10.1038/s41598-025-14538-3
Yamamoto, H., Suzuki, T. (2025). Exploring condition in which people accept AI over human judgements on justified defection. Scientific Reports 15, 3339. https://doi.org/10.1038/s41598-025-87170-w
Yamamoto, H., Okada, I., Sasaki, T., & Uchida, S. (2024). Clarifying social norms which have robustness against reputation costs and defector invasion in indirect reciprocity. Scientific Reports, 14, 25073. https://doi.org/10.1038/s41598-024-76168-5
Yamamoto, H., & Goto, A. (2024). Behavioural strategies in simultaneous and alternating prisoner's dilemma games with/without voluntary participation. Scientific Reports, 14, 21890. https://doi.org/10.1038/s41598-024-73353-4
Uchida, S., Sasaki, T., Yamamoto, H., & Okada, I. (2024). Evolution of "Pay-It-Forward" in the Presence of the Temptation to Free-Ride. Games, 15(3), 16. https://doi.org/10.3390/g15030016
Sasaki, T., Uchida, S., Okada, I., & Yamamoto, H. (2024). The Evolution of Cooperation and Diversity under Integrated Indirect Reciprocity. Games, 15(2), 15. https://doi.org/10.3390/g15020015
Yamamoto, H., Suzuki, T., Ogawa, Y. & Umetani, R. (2023). The effects of psychological attitudes on voluntary cooperation against COVID-19: an analysis using a social dilemma framework. Journal of Socio-Informatics, 16(1) pp.17-31. https://doi.org/10.14836/jsi.16.1_17
Umetani, R., Yamamoto, H., Goto, A., Okada, I., & Akiyama, E. (2023). Individuals reciprocate negative actions revealing negative upstream reciprocity. PLoS One, 18(7), e0288019. https://doi.org/10.1371/journal.pone.0288019
Suzuki, T., Yamamoto, H., Ogawa, and Umetani, R. (2023). Effects of media on preventive behaviour during the COVID-19 pandemic. Humanities and social sciences communications, 10, 58. https://doi.org/10.1057/s41599-023-01554-9
Yamamoto, H., Okada, I., Uchida, S., & Sasaki, T. (2022). Exploring norms indispensable for both emergence and maintenance of cooperation in indirect reciprocity. Frontiers in Physics, 10(September), 1–9. https://doi.org/10.3389/fphy.2022.1019422
Hackel, J., Yamamoto, H., Okada, I., Goto, A., & Taudes, A. (2021). Asymmetric effects of social and economic incentives on cooperation in real effort based public goods games. PLoS One, 16(4), e0249217. https://doi.org/10.1371/journal.pone.0249217
Okada, I., Yamamoto, H., Akiyama, E., & Toriumi, F. (2021). Cooperation in spatial public good games depends on the locality effects of game, adaptation, and punishment. Scientific Reports, 11(1), 7642. https://doi.org/10.1038/s41598-021-86668-3
Yamamoto, H., Suzuki, T., & Umetani, R. (2020). Justified defection is neither justified nor unjustified in indirect reciprocity. PLoS One, 15(6), e0235137. https://doi.org/10.1371/journal.pone.0235137Toriumi, F., Yamamoto, H., & Okada, I. (2020). A belief in rewards accelerates cooperation on consumer-generated media. Journal of Computational Social Science, Vol.3, pp.19-31. https://doi.org/10.1007/s42001-019-00049-5
Okada, I., Yamamoto, H., & Uchida, S. (2020). Hybrid Assessment Scheme Based on the Stern-Judging Rule for Maintaining Cooperation under Indirect Reciprocity. Games, 11(1), 13. https://doi.org/10.3390/g11010013
Yamamoto, H., Okada, I., Taguchi, T., & Muto, M. (2019). Effect of voluntary participation on an alternating and a simultaneous prisoner's dilemma. Physical Review E, 100(3), 032304. https://doi.org/10.1103/PhysRevE.100.032304
Kobayashi, T., Ogawa, Y., Suzuki, T., & Yamamoto, H. (2019). News audience fragmentation in the Japanese Twittersphere. Asian Journal of Communication, 29(3), 274–290. https://doi.org/10.1080/01292986.2018.1458326
Uchida, S., Yamamoto, H., Okada, I., & Sasaki, T. (2019). Evolution of Cooperation with Peer Punishment under Prospect Theory. Games, 10(1), 11. https://doi.org/10.3390/g10010011
Yamamoto, H., & Suzuki, T. (2018). Effects of beliefs about sanctions on promoting cooperation in a public goods game. Palgrave Communications, 4(1), 148. https://doi.org/10.1057/s41599-018-0203-8
Okada, I., Yamamoto, H., Sato, Y., Uchida, S., & Sasaki, T. (2018). Experimental evidence of selective inattention in reputation-based cooperation. Scientific Reports, 8(1), 14813. https://doi.org/10.1038/s41598-018-33147-x
Uchida, S., Yamamoto, H., Okada, I. & Sasaki, T. (2018). A Theoretical Approach to Norm Ecosystems : Two Adaptive Architectures of Indirect Reciprocity Show Different Paths to the Evolution of Cooperation. Frontiers in Physics, 6:14. https://doi.org/10.3389/fphy.2018.00014
Yamamoto, H., Okada, I., Uchida, S., & Sasaki, T. (2017). A norm knockout method on indirect reciprocity to reveal indispensable norms. Scientific Reports, 7, 44146. https://doi.org/10.1038/srep44146
Sasaki, T., Yamamoto, H., Okada, I., & Uchida, S. (2017). The Evolution of Reputation-Based Cooperation in Regular Networks. Games, 8(1), 8. http://doi.org/10.3390/g8010008
Toriumi, F., Yamamoto, H., & Okada, I. (2016). Exploring an Effective Incentive System on a Groupware. Journal of Artificial Societies and Social Simulation, 19(4). http://doi.org/10.18564/jasss.3166
Yamamoto, H., & Okada, I. (2016). How to keep punishment to maintain cooperation: Introducing social vaccine. Physica A, 443, 526-536. http://doi.org/10.1016/j.physa.2015.08.053
Okada, I., Yamamoto, H., Toriumi, F., & Sasaki, T. (2015). The Effect of Incentives and Meta-incentives on the Evolution of Cooperation. PLOS Computational Biology, 11(5), e1004232. doi:10.1371/journal.pcbi.1004232
Miyata, K., Yamamoto, H., & Ogawa, Y. (2015). What Affects the Spiral of Silence and the Hard Core on Twitter? An Analysis of the Nuclear Power Issue in Japan. American Behavioral Scientist, vol.59,No.9,pp.1129-1141, doi:10.1177/0002764215580618
Yamamoto, H., Okada, I., & Ogawa, Y. (2014). Analysis of a Public Good Game Permitted New Entries : a Role of Defectors to Maintain Cooperation. Journal of Advanced Computational Intelligence and Intelligent Informatics, 18(4), 624-631.
Toriumi, F., Yamamoto, H., & Okada, I. (2014). Influence of Payoff in Meta-Rewards Game. Journal of Advanced Computational Intelligence and Intelligent Informatics, 18(4), 616-623.
Isamu Okada, Hitoshi Yamamoto,"Mathematical description and analysis of adaptive risk choice behavior", ACM Transactions on Intelligent Systems and Technology, 14(1), 17:1--17:21,2013(1)
Isamu Okada and Hitoshi Yamamoto, "Effects of Information Diffusion in OnlineWord-of-Mouth Communication Among Consumers", Journal of Advanced Computational Intelligence and Intelligent Informatics, Vol.15 No.2, pp.197-203,2011(3)
Yamamoto, H., K., Ishida and T., Ohta,"Modeling Reputation Management System on Online C2C Market", Computational & Mathematical Organization Theory, Vol. 10,No. 2, pp.165-178,2004.