Jüngling S, Bock O, Girgenrath M
Department of Physiology, German Sport University, Köln.
Aviat Space Environ Med. 2002 May;73(5):430-5.
Earthbound studies have shown that for pointing movements there is a specific relationship between movement speed, amplitude, and accuracy that is known as Fitts' law. We investigated the validity of Fitts' law for grasping movements in normal and microgravity.
Subjects performed grasping movements toward virtual targets under three different time constraint conditions before and during exposure to microgravity in parabolic flights.
The "speed-accuracy trade-off" phenomenon was observed for the grasp component of prehension movements. The results were quantitatively similar in normal and microgravity such that increasing the speed resulted in a diminished accuracy.
Fitts' law is partially valid for grasping movements toward virtual targets without visual feedback of the hand in normal gravity. In a microgravity environment, performance of grasping movements also follows some of the predictions of Fitts' law.
地面研究表明，对于指向运动，运动速度、幅度和准确性之间存在一种特定关系，即菲茨定律。我们研究了菲茨定律在正常重力和微重力条件下对抓握运动的有效性。
在抛物线飞行中暴露于微重力之前和期间，受试者在三种不同的时间限制条件下对虚拟目标进行抓握运动。
在抓握动作的抓握部分观察到了“速度-准确性权衡”现象。正常重力和微重力条件下的结果在数量上相似，即速度增加导致准确性降低。
在正常重力下，菲茨定律对于在没有手部视觉反馈的情况下向虚拟目标的抓握运动部分有效。在微重力环境中，抓握运动的表现也遵循菲茨定律的一些预测。
