About the Authors

Takao Fukui

Affiliation NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Morinosato, Atsugi, Kanagawa, Japan

Toshitaka Kimura

Affiliation NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Morinosato, Atsugi, Kanagawa, Japan

Koji Kadota

Affiliation ERATO Shimojo Implicit Brain Function Project, Japan Science and Technology Agency, Atsugi, Kanagawa, Japan

Shinsuke Shimojo

Affiliations ERATO Shimojo Implicit Brain Function Project, Japan Science and Technology Agency, Atsugi, Kanagawa, Japan, Division of Biology, California Institute of Technology, Pasadena, California, United States of America

Hiroaki Gomi

gomi@idea.brl.ntt.co.jp

Affiliations NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Morinosato, Atsugi, Kanagawa, Japan, ERATO Shimojo Implicit Brain Function Project, Japan Science and Technology Agency, Atsugi, Kanagawa, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TF TK KK HG. Performed the experiments: TF TK KK HG. Analyzed the data: TF. Contributed reagents/materials/analysis tools: HG. Wrote the paper: TF TK KK SS HG.