About the Authors

Masahiko Terao

masahiko_terao@mac.com

Affiliations NTT Communication Science Laboratories, NTT Corporation, Kyoto, Japan, Department of Life Sciences, University of Tokyo, Meguro-ku, Tokyo, Japan, Graduate School of Humanities, Kwansei Gakuin University, Nishinomiya, Japan

Junji Watanabe

Affiliations NTT Communication Science Laboratories, NTT Corporation, Kyoto, Japan, Japan Society for the Promotion of Science, Chiyoda-ku, Tokyo, Japan

Akihiro Yagi

Affiliation Graduate School of Humanities, Kwansei Gakuin University, Nishinomiya, Japan

Shin'ya Nishida

Affiliation NTT Communication Science Laboratories, NTT Corporation, Kyoto, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MT JW AY SN. Performed the experiments: MT. Analyzed the data: MT. Wrote the paper: MT JW SN.