About the Authors

Ai Koizumi

bellkoizumi@gmail.com

Affiliations NTT Communication Science Laboratories, NTT Corporation, Kanagawa, Japan, Department of Psychology, The University of Tokyo, Tokyo, Japan, Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kanagawa, Japan

Norimichi Kitagawa

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

Hirohito M. Kondo

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

Miho S. Kitamura

Affiliations NTT Communication Science Laboratories, NTT Corporation, Kanagawa, Japan, Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan

Takao Sato

Affiliation Department of Psychology, The University of Tokyo, Tokyo, Japan

Makio Kashino

Affiliations NTT Communication Science Laboratories, NTT Corporation, Kanagawa, Japan, Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kanagawa, Japan, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Kanagawa, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AK NK HMK MSK TS MK. Performed the experiments: AK NK HMK MSK. Analyzed the data: AK NK. Contributed reagents/materials/analysis tools: AK NK HMK MK. Wrote the paper: AK NK HMK MSK TS MK.