Markham C H, Diamond S G
Department of Neurology, UCLA School of Medicine 90024-1769.
Aviat Space Environ Med. 1992 Feb;63(2):118-21.
Disconjugate eye torsion in hypo- and hypergravity of parabolic flight was examined in four former astronauts and four previously tested ex-astronauts to replicate an earlier study and to further test the asymmetry hypothesis of otolith function. Results in the new subjects supported the asymmetry hypothesis and confirmed previous findings that those with low scores of torsional disconjugacy on the KC-135 did not suffer space motion sickness in their prior Shuttle missions while those with high scores did. Tilting subjects with high disconjugacy scores slightly to one side and the other failed to find a position that decreased disconjugacy in hypergravity, leading to the conclusion that a simple planar asymmetry about the y-axis was probably not the cause of the observed torsional differences in the two eyes. Disconjugacy increased at 0 G with increasing parabolas, much more so in subjects who had suffered SMS. Because of this, 10 to 20 parabolas were deemed to be a more certain discriminator than a fewer number.
为了重复一项早期研究并进一步检验耳石功能的不对称假说，对四名前宇航员和四名曾接受过测试的前宇航员在抛物线飞行的低重力和高重力环境下的眼球非共轭扭转情况进行了检查。新受试者的结果支持了不对称假说，并证实了之前的发现，即在KC - 135上扭转非共轭得分低的人在之前的航天飞机任务中没有患空间运动病，而得分高的人则患了。将非共轭得分高的受试者向一侧或另一侧轻微倾斜，未能找到在高重力环境下能降低非共轭的位置，由此得出结论，关于y轴的简单平面不对称可能不是两只眼睛观察到的扭转差异的原因。在0G时，随着抛物线次数增加，非共轭性增加，在患过空间运动病的受试者中增加得更多。因此，10到20次抛物线被认为比更少次数的抛物线更能确定地进行区分。
