Our new paper is out.
Yamamoto, H., Suzuki, T., & Okada, I. (2026). Direct experience overrides reputation in evaluations of defection in indirect reciprocity. Evolution and Human Behavior, 47(6), 106980.
New paper!
Our new paper is now out!
Yamamoto, H., Suzuki, T., Ogawa, Y., & Umetani, R. (2026). Longitudinal predictors of vaccine conspiracy beliefs: findings from a five-wave panel study in Japan. Scientific Reports, 16(1), 23869. doi: 10.1038/s41598-026-57049-5
New papers!
Our new papers are out.
Yamamoto, H., Okada, I., & Suzuki, T. (2025). Gradual reputation dynamics evolve and sustain cooperation in indirect reciprocity. PLoS One, 20(8), e0329742.
Yamamoto, H., Okada, I., & Suzuki, T. (2025). Tolerant integrated reciprocity sustains cooperation in a noisy environment. Scientific Reports, 15(1), 28912.
Umetani, R., Yamamoto, H., & Akiyama, E. (2025) . Partner selection biases induced by resource inequality. Social Sciences & Humanities Open, 12, 101907.
New paper!
Our new paper is out!
Yamamoto, H., Suzuki, T. (2025). Exploring condition in which people accept AI over human judgements on justified defection. Scientific Reports 15, 3339.
New paper!
our new paper is now open!
Yamamoto, H., & Goto, A. (2024). Behavioural strategies in simultaneous and alternating prisoner’s dilemma games with/without voluntary participation. Scientific Reports, 14(1), 21890.
New papers!
Our two new papers out now!
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
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
New paper is now open!
A paper on the analysis of prosocial behavior in the COVID-19 pandemic has been published. Visit journal page!
New paper is out!
Our new paper is now published. Titled “Individuals reciprocate negative actions revealing negative upstream reciprocity.” in PLOS ONE.
Our new paper is now published.
Our new paper on COVID-19 has been published. Titled “Effects of media on preventive behaviour during the COVID-19 pandemic“.
A new paper was published
Our new paper on indirect reciprocity was published in Frontiers in Physics. Titled “Exploring norms indispensable for both emergence and maintenance of cooperation in indirect reciprocity.”