About the Authors

Takao Fukui

Current address: Equipe ImpAct, Centre de Recherches en Neurosciences de Lyon (CRNL), INSERM U1028 - CNRS UMR5292 - Université Lyon 1, Bron, France

Affiliations NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Morinosato, Atsugi, Kanagawa, Japan, CREST, Japan Science and Technology Agency, Honcho, Kawaguchi, Saitama, Japan

Hiroaki Gomi

gomi.hiroaki@lab.ntt.co.jp

Affiliations NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Morinosato, Atsugi, Kanagawa, Japan, CREST, Japan Science and Technology Agency, Honcho, Kawaguchi, Saitama, Japan

Competing Interests

The authors have read the journal's policy and have the following conflicts. Takao Fukui and Hiroaki Gomi are employed by Nippon Telegraph and Telephone Co who were one of the funders of this study. There are no patents, products in development or marketed products related to this research/study 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: TF HG. Performed the experiments: TF. Analyzed the data: TF HG. Contributed reagents/materials/analysis tools: HG. Wrote the paper: TF HG.