About the Authors

Ryoko Nakagawa

Affiliations Laboratory for Biolinguistics, RIKEN Brain Science Institute, Wako, Japan, Laboratory of Integrative Bioscience, Graduate School of Biomedical Sciences Hiroshima University, Hiroshima, Japan, Emotional Information Joint Research Laboratory, RIKEN Brain Science Institute, Wako, Japan

Eiji Matsunaga

Affiliations Laboratory for Biolinguistics, RIKEN Brain Science Institute, Wako, Japan, Laboratory for Symbolic Cognitive Development, RIKEN Brain Science Institute, Wako, Japan

Kazuo Okanoya

kazuookanoya@gmail.com

Affiliations Laboratory for Biolinguistics, RIKEN Brain Science Institute, Wako, Japan, ERATO Okanoya Emotional Information Project, JST-ERATO, Wako, Japan, Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan, Emotional Information Joint Research Laboratory, RIKEN Brain Science Institute, Wako, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RN EM KO. Performed the experiments: RN. Analyzed the data: RN. Wrote the paper: RN EM KO.