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Publication
Featured researches published by Koji Kitamura.
Frontiers in Neurology | 2018
Takao Imai; Yasumitsu Takimoto; Tomoko Okumura; Kayoko Higashi-Shingai; Noriaki Takeda; Koji Kitamura; Bukasa Kalubi; Takashi Fujikado; Masakazu Hirota; Yoshihiro Midoh; Koji Nakamae; Hidenori Inohara
The aim of this study was to propose a new pathophysiological hypothesis for involuntary eye oscillation in infantile nystagmus (IN): patients with IN exhibit impaired gaze fixation, horizontal smooth pursuit and optokinetic nystagmus (OKN) and use saccadic eye movements for these underlying impairments. In order to induce saccades, they make enough angle between gaze and target by precedent exponential slow eye movements. IN consists of the alternate appearance of the saccade and the slow eye movements. Unlike most previous theories, IN is therefore considered a necessary strategy allowing for better vision and not an obstacle to clear vision. In five patients with IN, eye movements were analyzed during the smooth pursuit test, saccadic eye movement test, OKN test and vestibulo-ocular reflex (VOR) test. Their gaze fixation, horizontal smooth pursuit, OKN and the last half of the slow phase of VOR were impaired. The lines obtained by connection of the end eye positions of fast phase of nystagmus coincided with the trajectories of targets. The findings indicate that patients followed the target by the fast but not the slow phase of nystagmus, which supports our hypothesis. By setting the direction of slow phase of nystagmus opposite to the direction of the OKN stimulation, enough angle can be effectively made between the gaze and target for the induction of saccade. This is the mechanism of reversed OKN response. In darkness and when eyes are closed, IN weakens because there is no visual target and neither the saccade for catching up the target or slow phase for induction of the saccade is needed.
Nippon Jibiinkoka Gakkai Kaiho | 2014
Motoyuki Suzuki; Kunitoshi Yoshino; Takashi Fujii; Masashi Yoshii; Toshimitsu Sugawa; Koji Kitamura
Nippon Jibiinkoka Gakkai Kaiho | 2016
Motoyuki Suzuki; Takashi Fujii; Tadashi Yoshii; Shinji Otozai; Koji Kitamura; Ryo Kanamura; Yoshihiko Omori; Taishi Minamino
Toukeibu Gan | 2015
Tadashi Yoshii; Takashi Fujii; Motoyuki Suzuki; Shinji Otozai; Kota Kida; Koji Kitamura; Toshimitsu Sugawa; Kunitoshi Yoshino; Tomoyuki Kurita; Teruki Teshima; Koji Konishi; Yoshifumi Kawaguchi; Takeo Hirata; Kinji Nishiyama
Practica oto-rhino-laryngologica | 2015
Kota Kida; Takashi Fujii; Tadashi Yoshii; Motoyuki Suzuki; Shinji Otozai; Toshimitsu Sugawa; Koji Kitamura; Ryo Kanamura; Ryosuke Koike
Nippon Jibiinkoka Gakkai Kaiho | 2015
Susumu Nakahara; Koji Kitamura; Keiichiro Honma; Yoshifumi Yamamoto; Yukinori Takenaka; Toshimichi Yasui; Atsushi Hanamoto; Eiichi Morii; Hidenori Inohara
Nippon Jibiinkoka Gakkai Kaiho | 2015
Motoyuki Suzuki; Takashi Fujii; Tadashi Yoshii; Shinji Otozai; Kohta Kida; Toshimitsu Sugawa; Koji Kitamura; Ryo Kanamura; Ryosuke Koike
/data/revues/00165107/unassign/S0016510715025936/ | 2015
Noboru Hanaoka; Ryu Ishihara; Yoji Takeuchi; Motoyuki Suzuki; Shinji Otozai; Kota Kida; Tadashi Yoshii; Takashi Fujii; Kunitoshi Yoshino; Toshimitsu Sugawa; Koji Kitamura; Ryo Kanemura; Ryosuke Koike; Noriya Uedo; Koji Higashino; Tomofumi Akasaka; Takeshi Yamashina; Takashi Kanesaka; Noriko Matsuura; Kenji Aoi; Yasushi Yamasaki; Kenta Hamada; Hiroyasu Iishi; Yasuhiko Tomita
Toukeibu Gan | 2014
Motoyuki Suzuki; Takashi Fujii; Tomoyuki Kurita; Masashi Yoshii; Shinji Otozai; Kohta Kida; Koji Kitamura; Toshimitsu Sugawa; Atsuko Takahara; Ryo Kanamura; Ryosuke Koike
Toukeibu Gan | 2013
Takashi Fujii; Kunitoshi Yoshino; Motoyuki Suzuki; Tadashi Yoshii; Tomoyuki Kurita; Toshimitsu Sugawa; Koji Kitamura