Abstract
Questions about the characteristics of after nystagmus were raised and discussed.1. Why is the behavior of OKN and OKAN so different in different animal species, especially between humans and monkeys ?2. Steady firing from the labyrinth is essential for generating OKAN. The elimination of OKAN may not be welcomed from the physiological point of view. Is vestibular neurectomy for treating Meniere disease etc. therefore not recommended ?3. The flocculus plays an important role in the generation of high speed OKAN. Is OKAN less prominent in patients with cerebellar lesions, including flocculus, than in normal subjects ?4. Horizontal OKAN is greatly reduced under 0 G conditions created by parabolic flight. Is OKAN reduced under microgravity conditions in space ?5. In monkeys, the velocity storage mechanism may be related to generation of the first phase of caloric nystagmus. There is some difference of caloric nystagmus direction between monkeys and human subjects, in supine and prone positions, especially in the direction of the torsional component. Is this phenomenon interpreted as species difference ?6. The same vestibular nucleus neurons share pathways of generations of OKAN and post rotatory nystgamus. Can we conclude that the time constant of these two types of nystagmus is similar ?
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