About the Authors

Nobuo Masataka

masataka@pri.kyoto-u.ac.jp

Affiliation Primate Research Institute, Kyoto University, Inuyama, Japan

Sachiko Hayakawa

Affiliation Primate Research Institute, Kyoto University, Inuyama, Japan

Nobuyuki Kawai

Affiliation Graduate School of Information Science, Nagoya University, Nagoya, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NM. Performed the experiments: SH NK. Analyzed the data: SH. Contributed reagents/materials/analysis tools: SH. Wrote the paper: NM.