HUMAN VESTIBULO-OCULAR RESPONSE AND PURPOSIVE ARM MOVEMENTS DURING GZ CENTRIFUGE STIMULATION

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Authors
  1. Bock, O.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);York Univ, North York ONT (CAN) Inst for Space and Terrestrial Science
Abstract
We studied the effects of hypergravity (hyper-G) on the accuracy of pointing without vision of the hand. Targets were presented under three conditions: display throughout the response, display up to movement onset, or recall from memory. Responses were recorded before, during the after subjects were exposed to hyper-G. In all target conditions, subject pointed higher in hyper-G than in normal gravity from the first movement on. We attribute the discrepancy between this finding and previous results to different movement strategies. When target were displayed in hyper-G throughout or before the responses, effects on pointing performance were small but sustained; in contrast, memorized targets yielded large and transient effects. We interpret these findings tentatively by the existence of two types of deficit in hyper-G: errors of motor control which are similar, and errors of target localization which are different in all three conditions. The second study evaluated the effects of hypergravity (hyper-G) on the kinematic characteristics and final accuracy of pointing movements, executed without vision of the hand. We found that for a given movement amplitude, peak upward velocity increased and movement duration decreased with increasing gravitational force. TRUNCATED
Keywords
Situational awareness;Hypergravity
Date of publication
01 Mar 1995
Number of Pages
51
DSTKIM No
97-02144
CANDIS No
502303
Format(s):
Hardcopy;Document Image stored on Optical Disk

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