*Naotoshi Abekawa¹, Sho Ito¹, Hiroaki Gomi¹ (1. NTT Communication Science Laboratories)

*Chika Yamane¹, Tomoko Hioki², Shoko Kaichida³, Jun Nishii¹ (1. Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2. Yamaguchi Junior College, 3. National Institute of Technology, Tokuyama College)

*Takahiro Arai¹, Kawamura Yoji², Toshio Aoyagi¹ (1. Graduate School of Informatics, Kyoto University, 2. Japan Agency for Marine-Earth Science and Technology)

*Hiroto Tamura^1,2,3, Gouhei Tanaka^1,2 (1. Graduate School of Engineering, The University of Tokyo, 2. International Research Center for Neurointelligence, The University of Tokyo, 3. Research Fellowship for Young Scientists (DC), Japan Society for the Promotion of Science)

*Koya Okawara¹, Yuichi Katori^1,2 (1. Future University Hakodate, 2. Institute of Industrial Science, the University of Tokyo)