眼振第2相に関する研究 : 第1編廻転後眼振第2相について

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The second phase of nystagmus in human appeared in 100 per cent with rotatory, in 72 per cent with caloric and in 80 per cent with optokinetic stimuli. In rabbits it appeared in 30 per cent with rotatory, in 78 per cent with caloric and in 100 per cent with optokinetic.Secondary phase is one of fundamental patterns common to all retatory, caloric and optokinetic nystagmus. However, it can not be observed in the presence of such inhibitory factors as vision, noise and etc.The value of minimal stimuli which is necessary to induce secondary nystagmus (secondary nystagmus threshold) varies under different conditions even in the same subjects. There is, however, a certain correlation between the threshold of rotatory and caloric secondary nystagmus. If one increases the other also increases, and vice versa.In animal-experiments, secondary nystagmus is apt to be recorded on the side of directional preponderance.It is thought that the secondary nystagmus is constituted by the primival tracts in the brain stem which are constantly influenced or controlled by the higher regulating vestibular nystagmus. tracts such as the cerebrum and the cerebellum.
社団法人日本耳鼻咽喉科学会の論文