Studies on the Central Mechanism of Optic-Vestibular Coordination during Nystagmus

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The authors have demonstrated that one of the most important roles of the vestibular labyrinth is to facilitate the optokinetic reflex and to back up visual perception. In this report, the central mechanism of optic-vestibular coordination during nystagmus was examined. Namely, electroencephalograms in the occipital area and in the nystagmogenic zone in the mesodiencephalon in rabbits, compared with optokinetic, labyrinthine and optokinetic-labyrinthine nystagmus, were observed. Pure optokinetic stimuli were given to rabbits by means of rotation of a large cylinder. Pure labyrinthine stimuli were given to rabbits with eyes covered by means of rotation of the Bárány's chair. Regular optokinetic labyrinthine stimuli were given to rabbits with eyes opened by means of rotation of the chair in the large cylinder. The observations were performed under no anesthesia. The following results were obtained.1. Pure labyrinthine stimuli by means of chair rotation with an angular acceleration of 1°/sec2. induced desynchronization of EEG of the occipital area. When labyrinthine stimuli were added to optokinetic stimuli, the labyrinth favours the optokinetic nystagmus with the activation of the brain stem reticular formation.2. The electrical activity of the nystagmogenic zone increased markedly by pure optokinetic stimuli and increased slightly by pure labyrinthine stimuli. And the most marked increasing was observed by optokinetic labyrinthine stimuli. These findings suggest that the nystagmogenic zone plays important roles as a center of optokinetic nystagmus circuit and as a place of optic-labyrinthine integration.
耳鼻咽喉科臨床学会の論文

Studies on the Central Mechanism of Optic-Vestibular Coordination during Nystagmus

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