Browsing by Subject "Motion Sickness"

Now showing 1 - 5 of 5
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    APAL 2019: Postural Data, Game Performance, and Subjective Responses of Cybersickness in Virtual Reality Head-Mounted Displays
    (2019-12-16) Curry, Christopher; Li, Ruixuan; Peterson, Nicolette; Stoffregen, Thomas; curry134@umn.edu; Curry, Christopher; University of Minnesota Affordance Perception-Action Laboratory
    Cybersickness is a subset of motion sickness and is experienced by users after they are immersed in a computer-generated virtual environment. Prior motion sickness research has shown that individuals that become motion sick display distinct kinematic patterns that differ from those that do not become sick. For this reason, kinematic data were collected before virtual reality (VR) exposure, and during exposure. Following exposure, some participants reported motion sickness. Subjects that reported motion sickness were classified into the sickness group, while those that did not report any symptoms were classified into the well group. This data set includes the collected kinematic data, subjective responses on the simulator sickness questionnaire, and game performance data. Kinematic data was collected before exposure via a force plate, and during exposure using a Polhemus Electromagnetic Tracker. The data are shared to follow guidelines as required by the journals we are submitting to.
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    Classroom Technology and Motion Sickness
    (2015-12) Mayo, Anthony
    This study was spurred by reports of a presentation software application causing symptoms of motion sickness in classroom and training environments. Many educators use presentation applications to help convey ideas and concepts related to course learning objectives. Thus, presentations that make learners ill can have a serious consequence on learning. Two experiments were conducted to investigate the influence of classroom presentations with different optic flow characteristics on symptoms of motion sickness. In Experiment 1, college-aged students were exposed to either a low optic flow (LOF) presentation or a high optic flow (HOF) presentation. In Experiment 2, students were exposed to either a HOF presentation or a moderate optic flow (MOF) one. In both experiments, students completed a Simulator Sickness Questionnaire (SSQ) (Kennedy, Lane, Berbaum, and Lilienthal, 1993) before and after instruction to assess severity of motion sickness. In addition, in both experiments, students completed a quiz that assessed learning. Wilcoxon Matched-Pairs Signed Rank Tests were conducted to determine differences in ranking of PRE- and POST-SSQ scores. Differences in quiz scores between groups were assessed using independent samples t-tests. In Experiment 1, participants who viewed a HOF presentation experienced a significant increase in simulator sickness symptoms, while those who viewed a LOF presentation did not. In Experiment 2, participants in both HOF and MOF groups experienced a significant increase in simulator sickness symptoms. In both experiments, no differences in quiz scores between groups were found. These results suggest that moderate to high amounts of optic flow can cause an increase in symptoms of motion sickness in individuals who view animated instructional presentations.
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    Cybersickness in Virtual Reality Head-Mounted Displays: Examining the Influence of Sex Differences, Vehicle Control and Postural Precursors
    (2021-05) Curry, Christopher
    The auspicious future of virtual reality could be thwarted by cybersickness.Cybersickness can be thought of as a subset of motion sickness and like motion sickness is more common among women than among men. Additionally, motion sickness is more common among passengers than among drivers. In this dissertation research, it was asked whether these two effects might interact. In a yoked-control design using a head-mounted display, one member of each pair drove a virtual automobile, while the other member watched a recording of the driver’s performance. In Chapter 2, it is explored whether such an interaction existed and the overall rates of cybersickness amongst these two groups. Previous research has shown that the subjective experience of cybersickness often is preceded by distinctive patterns of movement. In Chapter 3, it is examined whether such postural precursors of cybersickness might exist before participants were exposed to a virtual driving game presented. In this chapter, participants standing body sway was gathered while participants performed simple visual tasks (staring at a blank page vs. counting target letters in a block of text). In Chapter 4, movement of the head and torso was recorded while participants were exposed to a driving video while seated. These three chapters further inform the current understanding of cybersickness, and whether certain factors of the virtual environment may increase the likelihood of individuals becoming cybersick. Furthermore, chapters 3 and 4 further explore whether movement data can be used as an objective predictor in cybersickness research. If movement data further proves to be an objective predictor then this approach can be one iii of many approaches to assuage cybersickness for highly susceptible individuals.
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    Postural stability and sex differences in visually induced motion sickness
    (2016-08) Koslucher, Frank
    Within the motion sickness literature, it is well-established that symptoms are reported by women more often than men. Despite this, very little research has aimed to understand the cause of this sex-based difference. Sensory conflict theories posit that there is an evolutionary reason behind the phenomenon, such as protection of the fetus in pregnant women, but there is little evidence to substantiate this explanation. The postural instability theory claims that motion sickness is caused by destabilized or maladaptive control of the body in nauseogenic circumstances. Therefore, the reason behind the dimorphic reports of motion sickness may be that women utilize different strategies of postural control than men during these situations. I aimed to examine this possibility by using an epidemiological approach and gathering postural data on 114 male and female students as they were exposed to nauseogenic linear oscillation created by a moving room. In addition to collecting data on the movement of the center of pressure, I also gathered anthropometric information to both ensure sexual dimorphism and to compare and analyze how biomechanical structure may play a part in postural stability. Subjective data was gathered using the Simulator Sickness Questionnaire and through a forced-choice yes/no question, “Are you motion sick now?” All participants also completed a search/inspection paradigm prior to vexing stimuli to further explore differences in how men and women control their bodies according to task. Postural data was analyzed using positional variability, detrended fluctuation analysis, and the novel multifractal detrended fluctuation analysis. Women reported motion sickness nearly four times more than men, exceeding rates seen in previous field studies. Sickness incidence also correlated with sexually dimorphic anthropometrics between the sex groups, including overall height, height of the center of mass, and foot length, while symptom severity did not differ as a function of sex. Replicating previous findings, analysis of body sway found that people in the Sick group swayed differently than those in the Well group, both prior to and during nauseogenic stimulation. Before undergoing linear visual oscillation, sway was found to be affected by an interplay of task, sex, and postural control patterns that differ between those that get sick and those that do not. Additionally, men and women differed in their postural responses to the visual motion stimulus, a novel finding in optic flow research. Analysis of movement dynamics revealed the multifractal spectrum differed between sickness groups and that this difference evolved during moving room exposure, linking subjective experience to individual differences in the multifractality of movement. These results support the hypotheses that sex differences exist in visually-induced motion sickness susceptibility, that these differences are related to sex differences in anthropometrics that are, themselves, related to the kinematics of body sway, and these differences in susceptibility have their basis in sex differences in control of body posture, both before and during exposure to potentially nauseogenic stimuli.
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    The virtual reality head-mounted display Oculus Rift induces motion sickness and is sexist in its effects
    (2021-06) Munafo, Justin
    Anecdotal reports suggest that motion sickness may occur among users of contemporary, consumer-oriented head-mounted display systems, and that women may be at greater risk. I evaluated the nauseogenic properties of one such system, the Oculus Rift. The head-mounted unit included motion sensors that were sensitive to users’ head movements, such that head movements could be used as control inputs to the device. In two experiments, seated participants played one of two virtual reality games for up to 15 minutes. In Experiment 1, 22% of participants reported motion sickness, and the difference in incidence between men and women was not significant. In Experiment 2, motion sickness was reported by 56% of participants, and incidence among women (77.78%) was significantly greater than among men (33.33%). Before participants were exposed to the head-mounted display system, I recorded their standing body sway during the performance of simple visual tasks. In both experiments, patterns of pre-exposure body sway differed between participants who (later) reported motion sickness and those who did not. In Experiment 2, sex differences in susceptibility to motion sickness were preceded by sex differences in body sway. These postural effects confirm a prediction of the postural instability theory of motion sickness. The results indicate that users of contemporary head-mounted display systems are at significant risk of motion sickness, and that in relation to motion sickness these systems may be sexist in their effects.