A Review of Theoretical Studies on Indirect Reciprocity by Isamu Okada

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COVID-19 health certification reduces outgroup bias: evidence from a conjoint experiment in Japan by Yoshiaki Kubo, Isamu Okada

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Model of Multi-branch Trees for Efficient Resource Allocation by Natsumi Oyamaguchi, Hiroyuki Tajima, Isamu Okada

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Hybrid Assessment Scheme Based on the Stern-Judging Rule for Maintaining Cooperation under Indirect Reciprocity by Isamu Okada, Hitoshi Yamamoto, Satoshi Uchida

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Spatial opinion dynamics incorporating both positive and negative influence in small-world networks by Isamu Okada, Nozomi Okano , Akira Ishii 

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Evolution of Cooperation with Peer Punishment under Prospect Theory by Satoshi Uchida, Hitoshi Yamamoto, Isamu Okada, Tatsuya Sasaki

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Commitment to Cooperation and Peer Punishment: Its Evolution by Tatsuya Sasaki, Isamu Okada, Satoshi Uchida, Xiaojie Chen

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Cooperation in spatial public good games depends on the locality effects of game, adaptation, and punishment by Isamu Okada, Hitoshi Yamamoto, Eizo Akiyama, Fujio Toriumi

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Exploring norms indispensable for both emergence and maintenance of cooperation in indirect reciprocity by Hitoshi Yamamoto, Isamu Okada, Satoshi Uchida, Tatsuya Sasaki

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The Evolution of Reputation-Based Cooperation in Regular Networks by Tatsuya Sasaki, Hitoshi Yamamoto, Isamu Okada, Satoshi Uchida

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A Theoretical Approach to Norm Ecosystems: Two Adaptive Architectures of Indirect Reciprocity Show Different Paths to the Evolution of Cooperation by Satoshi Uchida, Hitoshi Yamamoto, Isamu Okada, Tatsuya Sasaki, Tatsuya Sasaki

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Individuals reciprocate negative actions revealing negative upstream reciprocity. by Ryohei Umetani, Hitoshi Yamamoto, Akira Goto, Isamu Okada, Eizo Akiyama

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Development of a New Support System for English Composition and its Performance Evaluation for International Communication by Hiroki Matsuyama, Mitsuyuki Miyazaki, Isamu Okada, Terumasa Ehara, Dawn Lavelle Miyazaki, Shinichiro Miyazawa

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Descriptive, injunctive, or the synergy of both? Experimenting normative information on behavioral changes under the COVID-19 pandemic by Isamu Okada, Itaru Yanagi, Yoshiaki Kubo, Yoshiaki Kubo, Yoshiaki Kubo, Yoshiaki Kubo, Yoshiaki Kubo, Hirokazu Kikuchi

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