○Yoshihiro Hirata¹, Ryougo Suzuki², Takeshi Matuo³, Takafumi Suzuki⁴, Atsuhiko Iijima², Isao Hasegawa¹, Keisuke Kawasaki¹ (1. Graduate School of Medical and Dental Sciences, Univ of Niigata, Niigata, Japan, 2. Graduate School of Science and Technology, Univ of Niigata, Niigata, Japan, 3. Tokyo Metropolitan Neurological Hospital, neurosurgery, 4. NICT, Center for Information and Neural Networks)