About the Authors

Masahiro Shiomi

m-shiomi@atr.jp

Affiliation Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan

Takamasa Iio

Affiliation Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan

Koji Kamei

Affiliation Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan

Chandraprakash Sharma

Affiliation Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan

Norihiro Hagita

Affiliation Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MS TI KK CS NH. Performed the experiments: MS TI KK CS NH. Analyzed the data: MS TI. Contributed reagents/materials/analysis tools: MS TI. Wrote the paper: MS TI KK CS NH.