title: Performance of a simple aiming task in hypergravity: I. overall accuracy.
abstract: BACKGROUND
  Visuo-motor performance is known to be affected by exposure to hyper-gravity (hyper-G), but the underlying mechanisms remain to be determined; the present study investigated the role of target mislocalization.
  
  
  METHODS
  Subjects pointed before, during and after exposure to hyper-G at targets without seeing their hand. Target positions were displayed: a) throughout each pointing response; b) before response onset; or c) in normal gravity prior to a set of movements.
  
  
  CONCLUSIONS
  For all display conditions, subjects pointed higher in hyper-G than in normal gravity from the first movement on. We attribute the discrepancy between this finding and previous results (8, 12) to different movement strategies. The effects of hyper-G on pointing performance were small, but sustained when targets were displayed before or throughout each movement, but they were large and transient when targets were memorized in normal-G. We conclude that too-high pointing in hyper-G cannot be simply explained by the "elevator illusion," and propose a tentative interpretation based on known perceptual deficits.
authors.affiliation: Institute for Space and Terrestrial Science, North York, Canada.
authors.forename: O
authors.initials: O
authors.lastname: Bock
authors.forename: K E
authors.initials: KE
authors.lastname: Arnold
authors.forename: B S
authors.initials: BS
authors.lastname: Cheung
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D018471:Hypergravity / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D011597:Psychomotor Performance