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https://www.readbyqxmd.com/read/29791445/the-search-for-instantaneous-vection-an-oscillating-visual-prime-reduces-vection-onset-latency
#1
Stephen Palmisano, Bernhard E Riecke
Typically it takes up to 10 seconds or more to induce a visual illusion of self-motion ("vection"). However, for this vection to be most useful in virtual reality and vehicle simulation, it needs to be induced quickly, if not immediately. This study examined whether vection onset latency could be reduced towards zero using visual display manipulations alone. In the main experiments, visual self-motion simulations were presented to observers via either a large external display or a head-mounted display (HMD)...
2018: PloS One
https://www.readbyqxmd.com/read/29764619/effects-of-unexpected-visual-motion-on-postural-sway-and-motion-sickness
#2
Mark Dennison, Michael D'Zmura
Motion sickness is thought to occur when the brain's assumptions about incoming sensory information do not match the actual signals received. These signals must involve the vestibular system for motion sickness to occur. In this paper, we describe an experiment in which subjects experienced unexpected visual motions, or perturbations, as they navigated a virtual environment (VE) while standing and wearing a head mounted display (HMD) or while viewing a monitor. We found that postural instability, as measured by a balance board, increased with time only when perturbations were present...
September 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29728744/free-breathing-quantification-of-hepatic-fat-in-healthy-children-and-children-with-nonalcoholic-fatty-liver-disease-using-a-multi-echo-3-d-stack-of-radial-mri-technique
#3
Tess Armstrong, Karrie V Ly, Smruthi Murthy, Shahnaz Ghahremani, Grace Hyun J Kim, Kara L Calkins, Holden H Wu
BACKGROUND: In adults, noninvasive chemical shift encoded Cartesian magnetic resonance imaging (MRI) and single-voxel magnetic resonance (MR) spectroscopy (SVS) accurately quantify hepatic steatosis but require breath-holding. In children, especially young and sick children, breath-holding is often limited or not feasible. Sedation can facilitate breath-holding but is highly undesirable. For these reasons, there is a need to develop free-breathing MRI technology that accurately quantifies steatosis in all children...
May 4, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29710687/analysis-of-human-microcirculation-in-weightlessness-study-protocol-and-pre-study-experiments
#4
Nana-Yaw Bimpong-Buta, Peter Jirak, Bernhard Wernly, Michael Lichtenauer, Maryna Masyuk, Johanna Maria Muessig, Kristina Braun, Sema Kaya, Malte Kelm, Christian Jung
BACKGROUND: In weightlessness, alterations in organ systems have been reported. The microcirculation consists of a network of blood vessels with diameters of a few μm. It is considered the largest part of the circulatory system of the human body and essential for exchange of gas, nutrients and waste products. An investigation of the microcirculation in weightlessness seems warranted but has not yet been performed. OBJECTIVE: In this paper, we outline a study in which we will investigate the possible interrelations between weightlessness and microcirculation...
April 14, 2018: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/29689763/relationship-between-motion-sickness-susceptibility-and-vestibulo-ocular-reflex-gain-and-phase
#5
Gilles Clément, Millard F Reschke
BACKGROUND: It has been proposed that individual susceptibility to motion sickness is related to the vestibulo-ocular reflex (VOR) through the activation of the velocity storage mechanism. OBJECTIVE: We investigated whether motion sickness level was related to the gain and phase of the VOR. METHODS: VOR gain and phase were measured in 214 subjects while they rotated in yaw at 0.01 Hz, 0.02 Hz, 0.04 Hz, 0.08 Hz, and 0.16 Hz in darkness, and results were compared to the severity of symptoms the subjects experienced during subsequent tests to provoke motion sickness...
April 18, 2018: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29681999/numerical-simulations-of-the-motion-and-deformation-of-three-rbcs-during-poiseuille-flow-through-a-constricted-vessel-using-ib-lbm
#6
Rongyang Wang, Yikun Wei, Chuanyu Wu, Liang Sun, Wenguang Zheng
The immersed boundary-lattice Boltzmann method (IB-LBM) was used to examine the motion and deformation of three elastic red blood cells (RBCs) during Poiseuille flow through constricted microchannels. The objective was to determine the effects of the degree of constriction and the Reynolds (Re) number of the flow on the physical characteristics of the RBCs. It was found that, with decreasing constriction ratio, the RBCs experienced greater forced deformation as they squeezed through the constriction area compared to at other parts of the microchannel...
2018: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/29673427/assessment-of-olfactory-perception-in-individuals-with-motion-sickness
#7
Laurence Jacquot, Jean-Louis Millot, Aurore Colette Paillard
BACKGROUND: Individuals who experience motion sickness (MS) frequently mention the presence of smells in the environment as a factor favoring the occurrence of MS symptoms. The aim of the present work was to compare olfactory function in MS sensitive (MS+) and insensitive (MS-) subjects. METHODS: Olfactory testing included determination of odor detection thresholds, subjective evaluation of the quality (intensity, hedonicity, and familiarity) of three different odorants (limonene, isovaleric acid, and petrol) as well as measures of skin conductance responses to these three odorants...
May 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29672256/an-analysis-of-vr-technology-used-in-immersive-simulations-with-a-serious-game-perspective
#8
Aline Menin, Rafael Torchelsen, Luciana Nedel
Using virtual environments (VEs) is a safer and cost-effective alternative to executing dangerous tasks, such as training firefighters and industrial operators. Immersive virtual reality (VR) combined with game aspects have the potential to improve the user experience in the VE by increasing realism, engagement, and motivation. This article investigates the impact of VR technology on 46 immersive gamified simulations with serious purposes and classifies it towards a taxonomy. Our findings suggest that immersive VR improves simulation outcomes, such as increasing learning gain and knowledge retention and improving clinical outcomes for rehabilitation...
March 2018: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/29662460/sensation-seeking-and-adaptation-in-parabonauts
#9
Aurélie Collado, Jean-Philippe Hainaut, Vincent Monfort, Benoît Bolmont
Evidence from extreme environments suggests that there are relationships between difficulties of adaptation and psychological factors such as personality. In the framework of microgravity research on humans, the aim of this exploratory study was to investigate inter-individual differences of parabonauts on the basis of quality of adaptation to the physical demands of parabolic flights. The personality characteristics of two groups of parabonauts with a different quality of adaptation (an Adaptive group, N = 7, and a Maladaptive group, N = 15) were assessed using the Sensation Seeking Scale, Brief COPE, and MSSQ-Short...
2018: Frontiers in Psychology
https://www.readbyqxmd.com/read/29649509/cybersickness-related-changes-in-brain-hemodynamics-a-pilot-study-comparing-transcranial-doppler-and-near-infrared-spectroscopy-assessments-during-a-virtual-ride-on-a-roller-coaster
#10
Alireza Mazloumi Gavgani, Rachel H X Wong, Peter R C Howe, Deborah M Hodgson, Frederick R Walker, Eugene Nalivaiko
Our aim was to assess cerebral blood flow changes during cybersickness. Transcranial Doppler (TCD) ultrasound and near infrared spectroscopy (NIRS) were used separately in two independent experiments. In both studies, a 15-min virtual roller coaster ride was used as a provocative visual stimulus. Subjective nausea ratings were obtained at 1 min intervals. The TCD study was performed in 14 healthy subjects (8 males and 6 females); in this study we also measured heart rate and arterial pressure. In a separate study a 52-channel NIRS device (Hitachi ETG-4000) was used to monitor activated brain regions by measuring oxy-hemoglobin (HbO2) concentration in 9 healthy subjects (4 male, 5 females)...
April 9, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29613981/phacomorphic-angle-closure-following-silicone-oil-tamponade-in-a-pediatric-patient
#11
Victoria C Leung, Simon Fung, Rajeev Muni, Asim Ali
PURPOSE: To report a case of phacomorphic glaucoma following retinal detachment repair with silicone oil in a pediatric patient. STUDY DESIGN: Case report. METHODS: A chart review was conducted at St. Michael's Hospital and The Hospital for Sick Children (Toronto, Canada), where the patient received ophthalmic care from July 28, 2015 onwards. RESULTS: A 14 year-old boy with a history of traumatic retinal detachment and proliferative vitreoretinopathy in the left eye, requiring two pars plana vitrectomies, membrane peel, and silicone oil tamponade, presented with one-day history of decreased vision in the left eye, severe headache, nausea, and vomiting...
April 2, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29600919/-motion-sickness-in-motion-from-carsickness-to-cybersickness
#12
J E Bos, R B van Leeuwen, T D Bruintjes
- Motion sickness is not a disorder, but a normal response to a non-normal situation in which movement plays a central role, such as car travel, sailing, flying, or virtual reality.- Almost anyone can suffer from motion sickness, as long as at least one of the organs of balance functions. If neither of the organs of balance functions the individual will not suffer from carsickness, seasickness, airsickness, nor from cybersickness. - 'Cybersickness' is a form of motion sickness that is stimulated by artificial moving images such as in videogames...
2018: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/29590147/influence-of-bone-conducted-vibration-on-simulator-sickness-in-virtual-reality
#13
Séamas Weech, Jae Moon, Nikolaus F Troje
Use of virtual reality (VR) technology is often accompanied by a series of unwanted symptoms, including nausea and headache, which are characterised as 'simulator sickness'. Sensory mismatch has been thought to lie at the heart of the problem and recent studies have shown that reducing cue mismatch in VR can have a therapeutic effect. Specifically, electrical stimulation of vestibular afferent nerves (galvanic vestibular stimulation; GVS) can reduce simulator sickness in VR. However, GVS poses a risk to certain populations and can also result in negative symptoms in normal, healthy individuals...
2018: PloS One
https://www.readbyqxmd.com/read/29589080/postural-time-to-contact-as-a-precursor-of-visually-induced-motion-sickness
#14
Ruixuan Li, Hannah Walter, Christopher Curry, Ruth Rath, Nicolette Peterson, Thomas A Stoffregen
The postural instability theory of motion sickness predicts that subjective symptoms of motion sickness will be preceded by unstable control of posture. In previous studies, this prediction has been confirmed with measures of the spatial magnitude and the temporal dynamics of postural activity. In the present study, we examine whether precursors of visually induced motion sickness might exist in postural time-to-contact, a measure of postural activity that is related to the risk of falling. Standing participants were exposed to oscillating visual motion stimuli in a standard laboratory protocol...
March 27, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29582143/genetic-contribution-to-vestibular-diseases
#15
REVIEW
Alvaro Gallego-Martinez, Juan Manuel Espinosa-Sanchez, Jose Antonio Lopez-Escamez
Growing evidence supports the contribution of allelic variation to vestibular disorders. Heritability attributed to rare allelic variants is found in familial vestibular syndromes such as enlarged vestibular aqueduct syndrome or familial Meniere disease. However, the involvement of common allelic variants as key regulators of physiological processes in common and rare vestibular diseases is starting to be deciphered, including motion sickness or sporadic Meniere disease. The genetic contribution to most of the vestibular disorders is still largely unknown...
March 26, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29562971/the-persistent-issue-of-simulator-sickness-in-naval-aviation-training
#16
Daniel J Geyer, Adam T Biggs
Virtual simulations offer nearly unlimited training potential for naval aviation due to the wide array of scenarios that can be simulated in a safe, reliable, and cost-effective environment. This versatility has created substantial interest in using existing and emerging virtual technology to enhance training scenarios. However, the virtual simulations themselves may hinder training initiatives by inducing simulator sickness among the trainees, which is a series of symptoms similar to motion sickness that can arise from simulator use...
April 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29553929/towards-a-machine-learning-approach-for-sickness-prediction-in-360%C3%A2-stereoscopic-videos
#17
Nitish Padmanaban, Timon Ruban, Vincent Sitzmann, Anthony M Norcia, Gordon Wetzstein
Virtual reality systems are widely believed to be the next major computing platform. There are, however, some barriers to adoption that must be addressed, such as that of motion sickness - which can lead to undesirable symptoms including postural instability, headaches, and nausea. Motion sickness in virtual reality occurs as a result of moving visual stimuli that cause users to perceive self-motion while they remain stationary in the real world. There are several contributing factors to both this perception of motion and the subsequent onset of sickness, including field of view, motion velocity, and stimulus depth...
April 2018: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/29547480/effect-of-gaze-stability-exercises-on-chronic-motion-sensitivity-a-randomized-controlled-trial
#18
Shilpa B Gaikwad, Eric G Johnson, Todd C Nelson, Oluwaseun I Ambode, Abdulaziz A Albalwi, Ahmad A Alharbi, Noha S Daher
BACKGROUND AND PURPOSE: Motion sensitivity is a common condition among the general population and may be accompanied by postural instability and anxiety. Preliminary studies suggest that minimal dosage of gaze stability exercises improves postural stability in young adults with chronic motion sensitivity. The aim of this study was to investigate the effect of progressive gaze stability exercises on postural stability, motion sensitivity, and anxiety in healthy young adults with chronic motion sensitivity...
April 2018: Journal of Neurologic Physical Therapy: JNPT
https://www.readbyqxmd.com/read/29522648/the-effects-of-the-selective-muscarinic-m3-receptor-antagonist-darifenacin-and-of-hyoscine-scopolamine-on-motion-sickness-skin-conductance-cognitive-function
#19
John F Golding, Keith A Wesnes, Brian R Leaker
AIMS: The aim of this study was to compare the effects of the selective M3 muscarinic acetylcholine receptor antagonist darifenacin, oral hyoscine hydrobromide and placebo on motion sickness induced by cross-coupled stimulation. METHODS: The effects of darifenacin 10 mg or 20 mg, hyoscine hydrobromide 0.6 mg and placebo were assessed in a randomized, double-blind, four-way cross over trial of 16 healthy subjects. Motion sickness, skin conductance (a measure of sweating) and psychomotor cognitive function tests were investigated...
March 9, 2018: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29505848/psychophysiological-assessment-and-correction-of-spatial-disorientation-during-simulated-orion-spacecraft-re-entry
#20
Patricia S Cowings, William B Toscano, Millard F Reschke, Addis Tsehay
The National Aeronautics and Space Administration (NASA) has identified a potential risk of spatial disorientation, motion sickness, and degraded performance to astronauts during re-entry and landing of the proposed Orion crew vehicle. The purpose of this study was to determine if a physiological training procedure, Autogenic-Feedback Training Exercise (AFTE), can mitigate these adverse effects. Fourteen men and six women were assigned to two groups (AFTE, no-treatment Control) matched for motion sickness susceptibility and gender...
March 2, 2018: International Journal of Psychophysiology
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