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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: Speed-accuracy trade-off of grasping movements during microgravity.
    Author: Jüngling S, Bock O, Girgenrath M.
    Journal: Aviat Space Environ Med; 2002 May; 73(5):430-5. PubMed ID: 12014601.
    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.
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