| 2021 | CogSci | Complexity of processing to activate magnitude representation for common fractions and precision of their magnitude representations in fraction magnitude comparison. | Yuki Tanida, Masahiko Okamoto |
| 2018 | CogSci | Exploring automatic metacognitive monitoring processes: Are errors in equations detected without intentional calculation? | Shogo Amano, Yoshihiro Nakagawa, Masahiko Okamoto |
| 2018 | CogSci | Effect of denominator in the fraction on number line estimation: an exploration of the list of the basic fraction in Japanese university students. | Saho Taniguchi, Yuki Tanida, Masahiko Okamoto |
| 2017 | CogSci | Relationship between four measures reflecting representations of fraction magnitude in adults: number line estimation, comparison, calculation of fractions, and immediate serial recall of fractions. | Yuki Tanida, Yu Koshima, Masahiko Okamoto |
| 2014 | ICCE | Schema Formulation with Schema Priming Test in Elementary Arithmetic Class in Japan. | Kazuhisa Seta, Akira Shimazoe, Kanetaka Mori, Masahiko Okamoto |
| 2012 | CogSci | Is the breaking point in mental number line in Japanese children five or ten? | Masahiko Okamoto, Sari Nakamura |
| 2012 | ICCE | Meta-cognitive Skill Training by Serializing Self-Dialogue and Discussion Processes. | Kazuhisa Seta, Ling Cui, Mitsuru Ikeda, Noriyuki Matsuda, Masahiko Okamoto |
| 2010 | ICCE | Basic Consideration to Improve Self-Regulatory Skills Using Mobile Devices. | Yuki Aoki, Kazuhisa Seta, Masahiko Okamoto |
| 2008 | ITS | An Experimental Use of Learning Environment for Problem-Posing as Sentence-Integration in Arithmetical Word Problems. | Tsukasa Hirashima, Takuro Yokoyama, Masahiko Okamoto, Akira Takeuchi |
| 2007 | AIED | Learning by Problem-Posing as Sentence-Integration and Experimental Use. | Tsukasa Hirashima, Takuro Yokoyama, Masahiko Okamoto, Akira Takeuchi |
| 2006 | ICCE | A Computer-Based Environment for Learning by Problem-Posing as Sentence-Integration. | Tsukasa Hirashima, Takuro Yokoyama, Masahiko Okamoto, Akira Takeuchi |
| 2005 | ICCE | Conceptual Changes in Learning Mechanics by Error-based Simulation. | Tomoya Horiguchi, Tsukasa Hirashima, Masahiko Okamoto |