Bock O, Fowler B, Comfort D
Dept of Physiology, German Sport University, Köln.
Aviat Space Environ Med. 2001 Oct;72(10):877-83.
It has been shown that pointing movements are slowed during microgravity, however there is a paucity of corresponding data for other movement types.
In our study, subjects pointed at visual targets without seeing their hand, and tracked targets moving around a circular path with and without hand vision, with and without a secondary reaction-time task.
Pointing responses were slowed distinctly in microgravity, but the speed of tracking movements was not affected. The secondary task had comparable effects on tracking performance in space and on Earth.
Response slowing in space is not due to an increased dependence on visual feedback, since it persists without hand vision. Differential effects of microgravity on pointing and tracking could be due to subjects' strategic decisions.
研究表明，在微重力环境下指向动作会变慢，然而，对于其他运动类型，相应的数据却很匮乏。
在我们的研究中，受试者在不看自己手的情况下指向视觉目标，并在有或没有手部视觉、有或没有二级反应时任务的情况下，跟踪沿圆形路径移动的目标。
在微重力环境下，指向反应明显变慢，但跟踪动作的速度不受影响。二级任务对太空和地球上的跟踪性能有类似的影响。
太空环境下的反应变慢并非由于对视觉反馈的依赖性增加，因为在没有手部视觉的情况下这种现象依然存在。微重力对指向和跟踪的不同影响可能是由于受试者的策略性决策。
