About the Authors

Makoto Ito

ito@oist.jp

Affiliation Okinawa Institute of Science and Technology Graduate University, Onna-son Okinawa, Japan

Kenji Doya

Affiliation Okinawa Institute of Science and Technology Graduate University, Onna-son Okinawa, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MI KD. Performed the experiments: MI. Analyzed the data: MI. Contributed reagents/materials/analysis tools: MI. Wrote the paper: MI KD.