Dynamic Characteristics of the Visual-Vestibular-Cervical Oculomotor System
スポンサーリンク
概要
- 論文の詳細を見る
The dynamic characteristics of the visual-vestibular and cervical oculomotor system were studied by the transfer function in normal subjects and in patients with labyrinthine dysfunction.1. The transfer function of the visual oculomotor system showed that the gain and phase were flat in a frequency range from 0.4 to 1.0Hz. Thus, the visual oculomotor system has a target movement fixation capability to a frequency level of 1Hz.2. The transfer function of the vestibular oculomotor system showed that the gain increased linearly at a rate of 5 dB/decade when the frequency of head oscillation increased from 0.3 to 2.5Hz. This result indicates the importance of the vestibulo-ocular reflex in visual fixation during fast head oscillations.3. The transfer function of visual-vestibular oculomotor coordination showed that the gain and phase were flat in a frequency range from 0.4 to 3.0 Hz. Thus, visual fixation during head movement to a frequency level of 3Hz is achieved by means of coordination of the visual-vestibular oculomotor systems.4. The cervical oculomotor system does not act independently as a stimulus to induce manifest eye movement, but under conditions of coordinated action with the visualvestibular-cervical oculomotor systems, visual fixation is achieved to a frequency level of 4 Hz.5. The transfer function of visual suppression of the vestibulo-ocular reflex showed that the gain increased linearly at a rate of 30dB/decade when the frequency of head oscillations increased from 0.3 to 3.0Hz. The visual suppression of the vestibuloocular reflex is fairly strong at low frequencies, compared with the dynamic characteristics of the vestibular oculomotor system.6. Patients with bilateral loss of labyrinthine excitability exhibited disturbance of visual fixation when head movements exceeded 1Hz.7. Patients with unilateral loss of labyrinthine excitability were capable of visual fixation when head movements exceeded 1Hz, but the frequency range was below normal.
- 耳鼻咽喉科臨床学会の論文
著者
関連論文
- Diagnosis of Vertigo from the Clinical History:On Labyrinthine Vertigo
- Dynamic Characteristics of the Visual-Vestibular-Cervical Oculomotor System
- Studies on Inverted Optokinetic Nystagmus
- Cervical neurilemmomas destroying the cervical vertebrae; Two patients treated surgically.:Two Patients Treated Surgically
- Therapeutic Results in Patients with Vertigo due to Circulatory Insufficiency
- Clinical and Pathologic Aural Findings in a Case of Diffuse Metastatic Leptomeningeal Carcinomatosis