Astrid J.A. Lubeck, MSc 1 Jelte E. Bos, PhD 1,2 John F. Stins, PhD 1 1 Research Institute MOVE,...
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Transcript of Astrid J.A. Lubeck, MSc 1 Jelte E. Bos, PhD 1,2 John F. Stins, PhD 1 1 Research Institute MOVE,...
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Astrid J.A. Lubeck, MSc1 Jelte E. Bos, PhD1,2 John F. Stins, PhD1
1 Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, the Netherlands
2 TNO Perceptual and Cognitive Systems, Soesterberg, the Netherlands
Moving and still images can induce comparable amounts of postural sway,
but different levels of sickness
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Introduction
Studies about the effect of moving images• General design experiments
1. Pre- and post measurement2. Variables:• Postural Sway• Visually induced motion sickness (VIMS)
3. Exposure to moving images
• Result– Postural sway ↑, VIMS ↑
• Are these results caused by motion?
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Introduction
Research question and hypothesis
• Research question– Is motion essential for causing an increase in postural sway and
VIMS?
• Hypothesis– Motion does cause an increase in postural sway and VIMS.
• No changes in still images condition.• Changes in moving images condition.
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Method
Subjects and design
• Subjects– 15 subjects– 6 males, 9 females– Mean (SD) age: 29.5 (5.9) years
• Design– Within subject design– Experimental condition: Moving images– Control condition: Still images– 2 measurements: Pre and post
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Method
Images
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Method
Measurements
• Postural sway– Force plate– Normal double stance
• Eyes closed– Duration: 60 seconds– Center of pressure (CoP) data
• Sway path length
• Visually induced motion sickness (VIMS)– Simulator sickness questionnaire (SSQ; Kennedy et al., 1993)– Only total score
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Results
Total simulator sickness scores
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Results
Sway path length
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Discussion
• Postural sway– Increase in SPL after exposure to both moving and still images
• VIMS– Only an increase in VIMS after exposure to moving images
• No difference in postural sway after exposure– Puzzling?
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Puzzling results?
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Discussion
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2 possible explanations
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• Wallpaper illusions – Can cause changes in postural sway (Kelly et al., 2005) – Can cause disorientation (Cohn & Lasley, 1990)
Discussion
Moved by still images
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Discussion
Moved by a first person shooter (FPS) game
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• Vection– Illusion of self-motion
• Do players experience vection or some other sensation?– Images may not contain adequate flow
• Sustained and unidirectional– Other possible mechanisms at work?
Discussion
Vection in FPS games?
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Still images can cause an increase in postural sway but only moving images cause motion sickness.
Conclusion
Take home message
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(potentiële) belangenverstrengeling Geen
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(financiële) vergoeding Aandeelhouder Andere relatie, namelijk …
• NWO MaGW onderzoekstalent
Disclosure of interests
Disclosure