DiZio P, Lackner J R
Ashton Graybiel Spatial Orientation Laboratory, Brandeis University, Waltham, MA 02254-9110.
Aviat Space Environ Med. 1991 Apr;62(4):300-7.
In parabolic flight experiments, we have found post-rotary nystagmus to be differentially suppressed in free fall (OG) and in a high gravitoinertial force (1.8G) background relative to 1G. In addition, the influence of postrotary head movements on nystagmus suppression was found to be contingent on G level. The nature of this pattern indicated a G-dependency of the velocity storage and dumping mechanisms. Here, we have rank-correlated susceptibility to motion sickness during head movements in OG and 1.8G with the following: a) the decay time constant of the slow phase velocity of post-rotary nystagmus under 1G, no head movement, baseline conditions, b) the extent of time constant reduction elicited in OG and 1.8G; c) the extent of time constant reduction elicited by head tilts in 1G; and d) changes in the extent of time constant reduction in OG and 1.8G over repeated tests. Susceptibility was significantly correlated with the extent to which a head movement reduced the time constant in 1G, was weakly correlated with the baseline time constant, but was not correlated with the extent of reduction in OG or 1.8G. This pattern suggests a link between mechanisms evoking symptoms of space motion sickness and the mechanisms of velocity storage and dumping. Experimental means of evaluating this link are described.
在抛物线飞行实验中，我们发现旋转后眼震在自由落体（零重力）和相对于1G的高重力惯性力（1.8G）背景下受到不同程度的抑制。此外，发现旋转后头运动对眼震抑制的影响取决于重力水平。这种模式的性质表明速度存储和释放机制存在重力依赖性。在此，我们将在零重力和1.8G下头运动期间对晕动病的易感性与以下因素进行等级相关分析：a）1G、无头部运动、基线条件下旋转后眼震慢相速度的衰减时间常数；b）零重力和1.8G下引起的时间常数降低程度；c）1G下头倾斜引起的时间常数降低程度；d）零重力和1.8G下重复测试中时间常数降低程度的变化。易感性与头部运动在1G下降低时间常数的程度显著相关，与基线时间常数弱相关，但与零重力或1.8G下的降低程度无关。这种模式表明引发空间晕动病症状的机制与速度存储和释放机制之间存在联系。描述了评估这种联系的实验方法。
