About the Authors

I-Fan Lin

lin.ifan@lab.ntt.co.jp (IL); kashino.makio@lab.ntt.co.jp (MK)

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

Takashi Yamada

Affiliations Medical Institute of Developmental Disabilities Research, Showa University, Tokyo, Japan, ATR Brain Information Communication Research Laboratory Group, Kyoto, Japan

Yoko Komine

Affiliation Medical Institute of Developmental Disabilities Research, Showa University, Tokyo, Japan

Nobumasa Kato

Affiliation Medical Institute of Developmental Disabilities Research, Showa University, Tokyo, Japan

Masaharu Kato

Affiliations NTT Communication Science Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan, Center for Baby Science, Doshisha University, Kyoto, Japan

Makio Kashino

lin.ifan@lab.ntt.co.jp (IL); kashino.makio@lab.ntt.co.jp (MK)

Affiliations NTT Communication Science Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan, Department of Information Processing, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan, CREST, JST, Atsugi, Kanagawa, Japan

Competing Interests

The support from the Ministry of Education, Culture, Sports, Science and Technology and NTT Corporation does not alter the authors adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: IL M. Kashino. Performed the experiments: IL TY YK NK M. Kashino M. Kato. Analyzed the data: IL. Contributed reagents/materials/analysis tools: IL. Wrote the paper: IL TY M. Kashino.