About the Authors

Francesco Zanlungo

zanlungo@atr.jp

Affiliations Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan, CREST, Japan Science and Technology Agency, Tokyo, Japan

Tetsushi Ikeda

Affiliations Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan, CREST, Japan Science and Technology Agency, Tokyo, Japan

Takayuki Kanda

Affiliations Intelligent Robotics and Communication Laboratories, ATR, Kyoto, Japan, CREST, Japan Science and Technology Agency, Tokyo, Japan

Competing Interests

All the authors of this work are employed by a commercial company “Intelligent Robotics and Communication Laboratories”, ATR, Kyoto, Japan. There are no patents, products in development or marketed products to declare. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials, as detailed online in the guide for authors.

Author Contributions

Conceived and designed the experiments: FZ. Performed the experiments: FZ TI. Analyzed the data: FZ. Contributed reagents/materials/analysis tools: FZ TI. Wrote the paper: FZ TK.