1. Department of Physiology Showa University School of Medicine Shinagawa‐ku Japan
2. Division of Neurology Department of Internal Medicine Showa University School of Medicine Shinagawa‐ku Japan
3. Kashino Diverse Brain Research Laboratory NTT Communication Science Laboratories Atsugi‐Shi Japan
4. Department of Medical Physiology Kyorin University School of Medicine Mitaka‐Shi Japan