Lackner J R, DiZio P
Ashton Graybiel Spatial Orientation Laboratory, Brandeis University, Waltham, MA 02254-9110.
Aviat Space Environ Med. 1991 Mar;62(3):206-11.
Head and body movements made in microgravity tend to bring on symptoms of motion sickness. Such head movements, relative to comparable ones made on Earth, are accompanied by unusual combinations of semicircular canal and otolith activity owing to the unloading of the otoliths in OG. Head movements also bring on symptoms of motion sickness during exposure to visual inversion (or reversal) on Earth because the vestibulo-ocular reflex is rendered anti-compensatory. Here, we present evidence that susceptibility to motion sickness during exposure to visual inversion is decreased in a 0G relative to a 1G force background. This difference in susceptibility appears related to the alteration in otolith function in 0G. Some implications of this finding for the etiology of space motion sickness are described.
在微重力环境下做出的头部和身体动作往往会引发晕动病症状。相对于在地球上做出的类似动作，此类头部动作伴随着半规管和耳石活动的异常组合，这是由于在轨道重力环境（OG）中耳石卸载所致。在地球上暴露于视觉倒置（或反转）期间，头部动作也会引发晕动病症状，因为前庭眼反射会产生反补偿作用。在此，我们提供证据表明，相对于1G力背景，在轨道重力环境（0G）中暴露于视觉倒置期间对晕动病的易感性会降低。这种易感性差异似乎与轨道重力环境（0G）中耳石功能的改变有关。本文描述了这一发现对太空晕动病病因学的一些启示。
