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https://www.readbyqxmd.com/read/29792509/modulation-of-excitability-in-the-temporoparietal-junction-relieves-virtual-reality-sickness
#1
Naoyuki Takeuchi, Takayuki Mori, Yoshimi Suzukamo, Shin-Ichi Izumi
Virtual reality (VR) immersion often provokes subjective discomfort and postural instability, so called VR sickness. The neural mechanism of VR sickness is speculated to be related to visual-vestibular information mismatch and/or postural instability. However, the approaches proposed to relieve VR sickness through modulation of brain activity are poorly understood. Using transcranial direct current stimulation (tDCS), we aimed to investigate whether VR sickness could be relieved by the modulation of cortical excitability in the temporoparietal junction (TPJ), which is known to be involved in processing of both vestibular and visual information...
May 24, 2018: Cyberpsychology, Behavior and Social Networking
https://www.readbyqxmd.com/read/29788412/treatment-of-mal-de-debarquement-syndrome-in-a-deployed-environment
#2
Stephanie M Schenk, Jacklyn M Wagner, Jarrod A Miller, Tracey M Lyons-White, Emilee C Venn, Michael D April, Brit Long, Steven G Schauer, Joshua J Oliver
We report the case of a 26-year-old Caucasian female with persistent sensations of forward and reverse movement with spontaneous onset. This worsened over 4 wk. The patient reported an episode of these symptoms 5 mo prior, which lasted for 3 mo before improving. Our case details the treatment of Mal de Debarquement syndrome, or Disembarkment Syndrome, in a deployed military environment. Mal de Debarquement was a term originally coined to describe the persistent sensation of rocking back and forth after disembarking a boat and returning to land...
May 18, 2018: Military Medicine
https://www.readbyqxmd.com/read/29785522/non-invasive-vagus-nerve-stimulation-significantly-improves-quality-of-life-in-patients-with-persistent-postural-perceptual-dizziness
#3
Ozan E Eren, Filipp Filippopulos, Kristina Sönmez, Ken Möhwald, Andreas Straube, Florian Schöberl
Persistent postural-perceptual dizziness (PPPD) is one of the most common causes of chronic vestibular disorders, with a substantial portion of the affected patients showing no significant improvement to standard therapies (i.e., pharmacotherapy, behavioral psychotherapy). Patients with PPPD have been shown to have a significant comorbidity with anxiety disorders and depression. Further, these patients show an activation of the autonomic nervous system resulting in symptoms such as nausea, increase of heart rate, and sweating...
May 21, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29768682/vestibulo-cortical-hemispheric-dominance-the-link-between-anxiety-and-the-vestibular-system
#4
Nadja F Bednarczuk, Marta Casanovas Ortega, Anne-Sophie Fluri, Qadeer Arshad
Vestibular processing and anxiety networks are functionally intertwined, as demonstrated by reports of reciprocal influences upon each other. Yet whether there is an underlying link between these two systems remains unknown Previous findings have highlighted the involvement of hemispheric lateralisation in processing of both anxiety and vestibular signals. Accordingly, we explored the interaction between vestibular cortical processing and anxiety by assessing the relationship between anxiety levels and the degree of hemispheric lateralisation of vestibulo-cortical processing in 64 right-handed, healthy individuals...
May 16, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29760579/the-effect-of-transcutaneous-neuromuscular-electrical-stimulation-on-laryngeal-vestibule-closure-timing-in-swallowing
#5
Christopher R Watts, Matthew J Dumican
Background: The purpose of this study was to investigate the effect of transcutaneous neuromuscular electrical stimulation (NMES) on the timing of laryngeal vestibule closure during the pharyngeal stage of swallowing in healthy adults. The theoretical framework proposed that NMES applied to these muscles would present a perturbation to laryngeal vestibular closure reaction time (the amount of time for the laryngeal vestibule to close once the swallowing reflex has been triggered) by providing an antagonistic force to the direction of vestibule closure...
2018: BMC Ear, Nose, and Throat Disorders
https://www.readbyqxmd.com/read/29750195/utilizing-sensory-prediction-errors-for-movement-intention-decoding-a-new-methodology
#6
Gowrishankar Ganesh, Keigo Nakamura, Supat Saetia, Alejandra Mejia Tobar, Eiichi Yoshida, Hideyuki Ando, Natsue Yoshimura, Yasuharu Koike
We propose a new methodology for decoding movement intentions of humans. This methodology is motivated by the well-documented ability of the brain to predict sensory outcomes of self-generated and imagined actions using so-called forward models. We propose to subliminally stimulate the sensory modality corresponding to a user's intended movement, and decode a user's movement intention from his electroencephalography (EEG), by decoding for prediction errors-whether the sensory prediction corresponding to a user's intended movement matches the subliminal sensory stimulation we induce...
May 2018: Science Advances
https://www.readbyqxmd.com/read/29747963/the-possible-effect-of-human-menopausal-gonadotropin-on-the-audio-vestibular-system
#7
Montaser Abdel-Salam, Osama G Abdel-Naby Awad, Mohamed El-Badry, Ahmed Ibrahim, Mahmoud Hosny Ibrahiem
OBJECTIVE: Human menopausal gonadotropin (HMG) is one of the commonest drugs used for ovarian stimulation with no reports on the audio-vestibular system. This study aims to examine HMG on the hearing profile of patients planning intracytoplasmic sperm injection (ICSI). METHODS: This prospective study was conducted from June 2016 to June 2017 in a tertiary referral hospital. The audio-vestibular system of a total of 30 patients was evaluated using pure tone audiometry, distortion product otoacoustic emissions (DPOAEs in the form of a DP-gram) and Vestibular-evoked myogenic potential (VEMP) immediately before therapy and at the day 10 after therapy...
May 7, 2018: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/29746219/feasibility-of-continuous-intraoperative-neural-monitoring-during-transoral-endoscopic-thyroidectomy-vestibular-approach-in-a-porcine-model
#8
Daqi Zhang, Shijie Li, Gianlorenzo Dionigi, Tie Wang, Jiao Zhang, Gaofeng Xue, Hui Sun
BACKGROUND: Experimental study to evaluate feasibility of continuous intraoperative neural monitoring (C-IONM) in transoral endoscopic thyroidectomy vestibular approach (TOETVA). METHODS: Duroc-Landrace pigs were orally intubated with electromyogram endotracheal tube. Automatic periodic stimulation (APS) electrode was allocated in the operative field through the 5-mm ports. APS was then repose on vagal nerve (VN) with different approaches: (1) median, that is, between sternothyroid and thyroid gland; and (2) lateral, that is, between sternocleidomastoid and sternothyroid...
May 10, 2018: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/29745627/neurophysiological-and-clinical-effects-of-blinfolded-balance-training-bbt-in-parkinson-s-disease-patients-a-preliminary-study
#9
Sonia Bonnì, Viviana Ponzo, Marco Tramontano, Alex Martino Cinnera, Carlo Caltagirone, Giacomo Koch, Antonella Peppe
BACKGROUND: Recent evidence support the hypothesis that rehabilitative strategies based on sensorimotor stimulation in the neurorehabilitation of Parkinson's Disease (PD) may be useful to improve gait in PD patients. AIM: We supposed that sensorimotor stimulation produce modulation of Anticipatory Postural Adjustments (APAs) arising from the supplementary motor area (SMA). We aimed to investigate the clinical and neurophysiological effects of a blindfolded balance training (BBT)...
May 9, 2018: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/29734006/disentangling-the-visual-motor-and-representational-effects-of-vestibular-input
#10
Naotoshi Abekawa, Elisa R Ferrè, Maria Gallagher, Hiroaki Gomi, Patrick Haggard
The body midline provides a basic reference for egocentric representation of external space. Clinical observations have suggested that vestibular information underpins egocentric representations. Here we aimed to clarify whether and how vestibular inputs contribute to egocentric representation in healthy volunteers. In a psychophysical task, participants were asked to judge whether visual stimuli were located to the left or to the right of their body midline. Artificial vestibular stimulation was applied to stimulate the vestibular organs...
April 12, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29708491/video-head-impulse-testing-in-a-pediatric-population-normative-findings
#11
Katheryn Bachmann, Kaitlin Sipos, Violette Lavender, Lisa L Hunter
BACKGROUND: The video head impulse test (vHIT) is a new tool being used in vestibular clinics to assess the function of all six semicircular canals (SCCs) by measuring the gain of the vestibulo-ocular reflex (VOR) in response to rapid head turns. Whereas vHIT has been validated in adults for all SCCs, there are few studies describing the normal response in children, particularly for stimulation of the vertical canals. PURPOSE: The purpose of this study was to characterize the normal vHIT response for all six SCCs in children aged 4-12 years...
May 2018: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/29702184/multisensory-vestibular-vestibular-auditory-and-auditory-network-effects-revealed-by-parametric-sound-pressure-stimulation
#12
Sun-Young Oh, Rainer Boegle, Matthias Ertl, Thomas Stephan, Marianne Dieterich
Multisensory convergence and sensorimotor integration are important aspects for the mediation of higher vestibular cognitive functions at the cortical level. In contrast to the integration of vestibulo-visual or vestibulo-tactile perception, much less is known about the neural mechanism that mediates the integration of vestibular-otolith (linear acceleration/translation/gravity detection) and auditory processing. Vestibular-otolith and auditory afferents can be simultaneously activated using loud sound pressure stimulation, which is routinely used for testing cervical and ocular vestibular evoked myogenic potentials (VEMPs) in clinical neurotological testing...
April 24, 2018: NeuroImage
https://www.readbyqxmd.com/read/29694841/effects-of-electrical-stimulation-of-the-rat-vestibular-labyrinth-on-c-fos-expression-in-the-hippocampus
#13
Martin Hitier, Go Sato, Yan-Feng Zhang, Stephane Besnard, Paul F Smith
Several studies have demonstrated that electrical activation of the peripheral vestibular system can evoke field potential, multi-unit neuronal activity and acetylcholine release in the hippocampus (HPC). However, no study to date has employed the immediate early gene protein, c-Fos, to investigate the distribution of activation of cells in the HPC following electrical stimulation of the vestibular system. We found that vestibular stimulation increased the number of animals expressing c-Fos in the dorsal HPC compared to sham control rats (P ≤ 0...
April 22, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29658983/subclinical-vestibular-dysfunction-in-migraineurs-without-vertigo-a-clinical-study
#14
L Bernetti, C Pellegrino, I Corbelli, S Caproni, P Eusebi, M Faralli, G Ricci, P Calabresi, P Sarchielli
OBJECTIVES: This observational study aimed to investigate the presence of potential vestibular system subclinical dysfunction among migraineurs without a history of vertigo and dizziness compared with healthy controls. METHODS: Patients diagnosed with episodic migraine with and without aura were enrolled. All patients and healthy controls underwent vestibular examination using the following conventional tests: sitting position, Pagnini-McClure's, Dix-Hallpike's, head hanging, video head impulse, subjective visual vertical, Romberg, Fukuda, and caloric vestibular stimulation by Fitzgerald-Hallpike's tests...
April 16, 2018: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/29658089/electrophysiological-properties-of-rat-vestibular-labyrinth-and-their-effect-on-parameters-of-transmitted-voltage-pulses
#15
V P Demkin, V V Udut, P P Shchetinin, M V Svetlik, S V Mel'nichuk, A P Shchetinina, M O Pleshkov, D N Starkov, O V Demkin, H Kingma
We propose a new approach to optimization of electrical stimulation of the vestibular nerve and improving the transfer function of vestibular implant. A mathematical model of the vestibular organ is developed based on its anatomy, the model premises, 3D-analysis of MRI and CT images, and mathematical description of physical processes underlying propagation of alternating electric current across the tissues of vestibular labyrinth. This approach was tested in vitro on the rat vestibular apparatus and had been examined anatomically prior to the development of its mathematical model and equivalent electrical circuit...
April 16, 2018: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29656906/exhibition-of-stochastic-resonance-in-vestibular-tilt-motion-perception
#16
R C Galvan-Garza, T K Clark, A P Mulavara, C M Oman
BACKGROUND: Stochastic Resonance (SR) is a phenomenon broadly described as "noise benefit". The application of subsensory electrical Stochastic Vestibular Stimulation (SVS) via electrodes behind each ear has been used to improve human balance and gait, but its effect on motion perception thresholds has not been examined. OBJECTIVE: This study investigated the capability of subsensory SVS to reduce vestibular motion perception thresholds in a manner consistent with a characteristic bell-shaped SR curve...
April 3, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29651250/efficacy-of-stochastic-vestibular-stimulation-to-improve-locomotor-performance-during-adaptation-to-visuomotor-and-somatosensory-distortion
#17
David R Temple, Yiri E De Dios, Charles S Layne, Jacob J Bloomberg, Ajitkumar P Mulavara
Astronauts exposed to microgravity face sensorimotor challenges affecting balance control when readapting to Earth's gravity upon return from spaceflight. Small amounts of electrical noise applied to the vestibular system have been shown to improve balance control during standing and walking under discordant sensory conditions in healthy subjects, likely by enhancing information transfer through the phenomenon of stochastic resonance. The purpose of this study was to test the hypothesis that imperceptible levels of stochastic vestibular stimulation (SVS) could improve short-term adaptation to a locomotor task in a novel sensory discordant environment...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29600919/-motion-sickness-in-motion-from-carsickness-to-cybersickness
#18
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/29596981/the-vestibulomyogenic-balance-response-is-elevated-following-high-intensity-lengthening-contractions-of-the-lower-limb
#19
Emily I McIntosh, Geoffrey A Power, Brian H Dalton
The purpose was to investigate whether induced muscle weakness of the plantar and dorsiflexors through high-intensity lengthening contractions increases the vestibulomyogenic balance response. Nine males (∼25 years) participated in three experimental testing days to evaluate the vestibular control of standing balance and neuromuscular function of the plantar and dorsiflexors pre- and post (30 min, and 1 and 7 days) high-intensity lengthening plantar and dorsiflexions. To evaluate the vestibular-evoked balance response, participants stood quietly on a force plate while exposed to continuous, random electrical vestibular stimulation (EVS) for two 90-s trials...
March 26, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29590147/influence-of-bone-conducted-vibration-on-simulator-sickness-in-virtual-reality
#20
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
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