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Publication AbstractsOptokinetic Drum Tilt Hastens the Onset of Vection-Induced Motion SicknessAndrea Bubka and Frederick BonatoAviat Space Environ Med 2003; 74:315-19 AbstractBackground: Under optokinetic drum conditions, a stationary participant views the patterned interior of a rotating drum. Quickly, most participants perceive illusory self-rotation in the direction opposite to the drum's true rotation (vection). It has been documented that up to 60% of participants experience motion sickness-like symptoms under optokinetic conditions perhaps because of conflicting sensory information from the visual and vestibular systems. Methods: Keeping rotation speed constant (10 RPM), drum tilt relative to the axis of rotation was systematically manipulated (0°, 5°, 10°), producing a wobble effect. Overall well-being and eight motion sickness symptoms were assessed every 2 min using subjective scales. Results: Participants reported 1) a complex type of circular vection that included a "wobble" or "sway" component and 2) a quicker onset of motion sickness-like symptoms as tilt increased. Conclusion: In a tilted drum, the vestibular system correctly indicates that the participant is stationary while the visual system indicates a complex type of self-rotation. This type of sensory conflict is more severe than what takes place under typical optokinetic drum conditions (no tilt). Results suggest that as visual/vestibular sensory conflict increases, so does the speed at which motion sickness symptoms occur.Keywords: vection, simulator sickness, cybersickness, motion sickness, optokinetic drum. Information on subscribing, and on obtaining copies of an article or of an entire issue. Table of Contents for Volume 74, Number 4 of the ASEM journal.
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