[1] Univ Tokyo, Grad Sch Educ, Bunkyo Ku, Tokyo 1130033, Japan
[2] Res Inst Natl Rehabil Ctr Persons Disabilities, Dept Rehabil Movement Funct, Tokorozawa, Saitama 3598555, Japan
[3] Queens Univ, Ctr Neurosci Studies, Dept Anat & Cell Biol, Kingston, ON K7L 3N6, Canada