S Jüngling1, O Bock, M Girgenrath. 1. Department of Physiology, German Sport University, Köln. jungling@hrz.dshs-koeln.de
Abstract
BACKGROUND: 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. METHOD: Subjects performed grasping movements toward virtual targets under three different time constraint conditions before and during exposure to microgravity in parabolic flights. RESULTS: 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. CONCLUSIONS: 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.
BACKGROUND: 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. METHOD: Subjects performed grasping movements toward virtual targets under three different time constraint conditions before and during exposure to microgravity in parabolic flights. RESULTS: 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. CONCLUSIONS: 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.
Authors: Stefan Schneider; Vera Brümmer; Andreas Mierau; Heather Carnahan; Adam Dubrowski; Heiko K Strüder Journal: Exp Brain Res Date: 2007-11-01 Impact factor: 1.972
Authors: Timo Klein; Petra Wollseiffen; Marit Sanders; Jurgen Claassen; Heather Carnahan; Vera Abeln; Tobias Vogt; Heiko K Strüder; Stefan Schneider Journal: Exp Brain Res Date: 2019-02-11 Impact factor: 1.972