Original Articles

• Reciprocity-Norm Similarity and Cooperative Investment Within Friendships

  Ryo Oda, Tensei Tanaka

  46-54

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• Oxytocin Receptor Polymorphism rs9840864 and Childhood Parental Attentiveness in Relation to Moral Foundations

  Keiko Ishii, Masahiro Matsunaga, Yasuki Noguchi, Hidenori Yamasue, Yohsuke Ohtsubo

  55-58

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• Successful Social Learners Can Choose the Better of Two Options: An Agent-Based Simulation Successful social learning strategy

  Masayuki Fujita, Yohsuke Ohtsubo

  59-64

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