About the Authors

Katsumi Watanabe

kw@fennel.rcast.u-tokyo.ac.jp

Affiliations Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan, Human Technology Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, Japan Science and Technology Agency, Saitama, Japan

Tetsuya Matsuda

Affiliation Brain Science Institute, Tamagawa University, Tokyo, Japan

Tomoyuki Nishioka

Affiliation Department of Synthetic Design, Tsukuba University of Technology, Tsukuba, Japan

Miki Namatame

Affiliation Department of Synthetic Design, Tsukuba University of Technology, Tsukuba, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KW TM MN. Performed the experiments: MN. Analyzed the data: KW TN MN. Contributed reagents/materials/analysis tools: TM TN. Wrote the manuscript: KW MN.