title: Human manual control performance in hyper-gravity.
abstract: Hyper-gravity provides a unique environment to study how misperceptions impact control of orientation relative to gravity. Previous studies have found that static and dynamic roll tilts are perceptually overestimated in hyper-gravity. The current investigation quantifies how this influences control of orientation. We utilized a long-radius centrifuge to study manual control performance in hyper-gravity. In the dark, subjects were tasked with nulling out a pseudo-random roll disturbance on the cab of the centrifuge using a rotational hand controller to command their roll rate in order to remain perceptually upright. The task was performed in 1, 1.5, and 2 G's of net gravito-inertial acceleration. Initial performance, in terms of root-mean-square deviation from upright, degraded in hyper-gravity relative to 1 G performance levels. In 1.5 G, initial performance degraded by 26 % and in 2 G, by 45 %. With practice, however, performance in hyper-gravity improved to near the 1 G performance level over several minutes. Finally, pre-exposure to one hyper-gravity level reduced initial performance decrements in a different, novel, hyper-gravity level. Perceptual overestimation of roll tilts in hyper-gravity leads to manual control performance errors, which are reduced both with practice and with pre-exposure to alternate hyper-gravity stimuli.
authors: Man Vehicle Laboratory, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA, USA, torin@mit.edu.
authors: Torin K
authors: TK
authors: Clark
authors: Michael C
authors: MC
authors: Newman
authors: Daniel M
authors: DM
authors: Merfeld
authors: Charles M
authors: CM
authors: Oman
authors: Laurence R
authors: LR
authors: Young
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006225:Hand; D006801:Humans; D018471:Hypergravity; D008297:Male; D008875:Middle Aged; D009949:Orientation; D011597:Psychomotor Performance / Q000502:physiology*; D011601:Psychophysics; D012399:Rotation; D013028:Space Perception; D055815:Young Adult
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