Browsing by Subject "motion sickness"

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    APAL Coupling Study 2019
    (2019-03-04) Walter, Hannah; Li, Ruixuan; Munafo, Justin; Curry, Christopher; Peterson, Nicolette; Stoffregen, Thomas; walte666@umn.edu; Walter, Hannah; University of Minnesota Affordance Perception-Action Lab
    Motion sickness is preceded by differences in the quantitative kinematics of body sway between individuals who (later) become sick and those who do not. In existing research, this effect has been demonstrated only in measures of body sway, relative to the earth. However, body sway can become coupled with imposed oscillatory motion of the illuminated environment, and the nature of this coupling may differ between individuals who become sick and those who do not. We asked whether body sway would become coupled to complex oscillations of the illuminated environment, and whether individual differences in such coupling might be precursors of motion sickness. Standing participants were exposed to complex oscillation of the illuminated environment. We examined the strength of coupling as a function of time during exposure. Following exposure, some participants reported motion sickness. The nature and temporal evolution of coupling differed between participants who later reported motion sickness and those who did not. Our results show that people can couple the complex dynamics of body sway with complex imposed motion, and that differences in the nature of this coupling are related to the risk of motion sickness.
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    Connect [Spring/Summer 2015]
    (University of Minnesota: College of Education and Human Development, 2015-03) University of Minnesota: College of Education and Human Development
    World classroom: Global brainpower and a balance of theory and applied experience set Minnesota’s comparative and international development education program apart. All hands on deck Pioneering international educator Josef Mestenhauser, 1925-2015, lent urgency to the work of teaching and learning. Inquiry in motion: A dizzying look into student research in an unusual lab. Family and friends to the rescue: Everyday relationships are the first line of support for marriages in trouble.
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    Control of a virtual vehicle influences postural activity and motion sickness
    (2011-05-06) Dong, Xiao; Yoshida, Ken; Stoffregen, Thomas
    Everyday experience suggests that drivers are less susceptible to motion sickness than passengers. In the context of inertial motion (i.e., physical displacement), this effect has been confirmed in laboratory research using whole body motion devices. We asked whether a similar effect would occur in the context of simulated vehicles in a visual virtual environment. We used a yoked control design in which one member of each pair of participants played a driving video game (i.e., drove a virtual automobile). A recording of that performance was viewed (in a separate session) by the other member of the pair. Thus, the two members of each pair were exposed to identical visual motion stimuli but the risk of behavioral contagion was minimized. Participants who drove the virtual vehicle (drivers) were less likely to report motion sickness than participants who viewed game recordings (passengers). Data on head and torso movement revealed that drivers tended to move more than passengers, and that the movements of drivers were more predictable than the movements of passengers. Prior to the onset of subjective symptoms of motion sickness movement differed between participants who (later) reported motion sickness and those who did not, consistent with a prediction of the postural instability theory of motion sickness. The results confirm that control is an important factor in the etiology of motion sickness, and extend this finding to the control of non-inertial virtual vehicles.
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    Postural Time-To-Contact, Real-Time Visual Feedback Of Postural Activity, And Motion Sickness
    (2018-12) Li, Ruixuan
    The postural instability theory of motion sickness predicts that the subjective symptoms of motion sickness will be preceded by unstable control of posture. In previous research, it has been confirmed with measures of the spatial magnitude and temporal dynamic of postural activity. In the first chapter, I introduced a new measure (postural time-to-contact (VTC)) which is related to the risk of falling. Standing participants were exposed to visual oscillation stimuli. I measured the kinematics of the body’s center of pressure. The results show that postural time-to-contact differed between the Well and Sick groups before and during the exposure to the visual motion stimuli. The multifractality of sway differed between the Well and Sick groups during the room exposure. In Chapter 2, I examined the real-time feedback of body’s center of pressure with the same protocol as Chapter 1. The chi-square test between the sickness and the display format (blank screen and real-time feedback) suggests that the real-time feedback increases the risk of motion sickness. Body sway also differed before any participants experienced subjective symptoms of motion sickness. In Chapter 3, I measured the correlation between postural measures and motion sickness symptoms severity (TSS). The change of TSS has a higher Pearson correlation to the VTC in the blank screen condition than the motion sickness susceptibility total score (MSSQt). Principal component analysis (PCA) and linear discriminant analysis (LDA) were implemented to construct motion sickness susceptibility score of postural activity (MSSPA). The LDA score in the blank screen condition outperformed the PCA score in both conditions, the LDA score in the feedback condition and the MSSQt regarding its relation to motion sickness symptom severity score. Since this experiment was completed in a moving room setting (open-loop), further examination of MSSPA in the tablet computer, simulator and virtual reality (closed-loop).