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galvanic vestibular stimulation

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https://www.readbyqxmd.com/read/29750195/utilizing-sensory-prediction-errors-for-movement-intention-decoding-a-new-methodology
#1
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/29656906/exhibition-of-stochastic-resonance-in-vestibular-tilt-motion-perception
#2
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/29590147/influence-of-bone-conducted-vibration-on-simulator-sickness-in-virtual-reality
#3
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/29574462/remote-limb-ischemic-preconditioning-attenuates-cerebrovascular-depression-during-sinusoidal-galvanic-vestibular-stimulation-via-%C3%AE-1-adrenoceptor-protein-kinase-c%C3%AE%C2%B5-endothelial-no-synthase-pathway-in-rats
#4
Devin W McBride, Cesar Reis, John H Zhang, Richard Applegate, Jiping Tang
BACKGROUND: Vasovagal syncope (VVS) is characterized by hypotension and bradycardia followed by lowering of cerebral blood flow. Remote limb ischemic preconditioning (RIPC) is well documented to provide cardio- and neuroprotection as well as to improve cerebral blood flow. We hypothesized that RIPC will provide protection against VVS-induced hypotension, bradycardia, and cerebral hypoperfusion. Second, because endothelial nitric oxide synthase has been reported as a mediator of cerebral blood flow control, we hypothesized that the mechanism by which RIPC primes the vasculature against VVS is via the α1 -adrenoceptor-protein kinase Cε-endothelial nitric oxide synthase pathway...
March 24, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29574253/probing-the-role-of-the-vestibular-system-in-motivation-and-reward-based-attention
#5
Elvio Blini, Caroline Tilikete, Alessandro Farnè, Fadila Hadj-Bouziane
The vestibular system has widespread connections in the central nervous system. Several activation loci following vestibular stimulations have been notably reported in deep, limbic areas that are otherwise difficult to reach and modulate in healthy subjects. Following preliminary evidence, suggesting that such stimulations might affect mood and affective processing, we wondered whether the vestibular system is also involved in motivation. Evolutionary accounts suggest that visuo-vestibular mismatches might have a role in preventing the search for and exploitation of goods that previously resulted in aversive reactions, as they would be a fine warning signal which follows the contact with or ingestion of noxious neurotoxins...
February 27, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29563049/noisy-vestibular-stimulation-increases-gait-speed-in-normals-and-in-bilateral-vestibulopathy
#6
Shinichi Iwasaki, Chisato Fujimoto, Naoya Egami, Makoto Kinoshita, Fumiharu Togo, Yoshiharu Yamamoto, Tatsuya Yamasoba
BACKGROUND: Galvanic vestibular stimulation delivered as zero-mean current noise (noisy GVS) has been shown to improve static and dynamic postural stability probably by enhancing vestibular information. OBJECTIVE: /Hypothesis: To examine the effect of an imperceptible level of noisy GVS on dynamic locomotion in normal subjects as well as in patients with bilateral vestibulopathy. METHODS: Walking performance of 19 healthy subjects and 12 patients with bilateral vestibulopathy at their preferred speed was examined during application of noisy GVS with an amplitude ranging from 0 to 1000 μA...
March 10, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29545766/noisy-galvanic-stimulation-improves-roll-tilt-vestibular-perception-in-healthy-subjects
#7
Aram Keywan, Max Wuehr, Cauchy Pradhan, Klaus Jahn
It has recently been demonstrated that noisy galvanic vestibular stimulation (nGVS) delivered as imperceptible white noise can improve balance control via the induction of stochastic resonance. However, it is unclear whether these balance improvements are accompanied by simultaneous enhancement to vestibular motion perception. In this study, 15 healthy subjects performed 8 quiet-stance tasks on foam with eyes closed at 8 different nGVS amplitudes ranging from 0 mA (baseline) to 0.5 mA. The nGVS amplitude that improved balance performance most compared to baseline was assigned as the optimal nGVS amplitude...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29541016/galvanic-vestibular-stimulation-gvs-augments-deficient-pedunculopontine-nucleus-ppn-connectivity-in-mild-parkinson-s-disease-fmri-effects-of-different-stimuli
#8
Jiayue Cai, Soojin Lee, Fang Ba, Saurabh Garg, Laura J Kim, Aiping Liu, Diana Kim, Z Jane Wang, Martin J McKeown
Falls and balance difficulties remain a major source of morbidity in Parkinson's Disease (PD) and are stubbornly resistant to therapeutic interventions. The mechanisms of gait impairment in PD are incompletely understood but may involve changes in the Pedunculopontine Nucleus (PPN) and its associated connections. We utilized fMRI to explore the modulation of PPN connectivity by Galvanic Vestibular Stimulation (GVS) in healthy controls ( n = 12) and PD subjects even without overt evidence of Freezing of Gait (FOG) while on medication ( n = 23)...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29508134/noisy-vestibular-stimulation-improves-vestibulospinal-function-in-patients-with-bilateral-vestibulopathy
#9
R Schniepp, J C Boerner, J Decker, K Jahn, T Brandt, Max Wuehr
OBJECTIVES: To examine the mechanism underlying previously reported ameliorating effects of noisy galvanic vestibular stimulation (GVS) on balance performance in patients with bilateral vestibulopathy (BVP) and determine those patients (incomplete versus complete vestibular loss) that might benefit from this intervention. METHODS: Vestibulospinal reflex thresholds were determined in 12 patients with BVP [2 with complete loss (cBVP) and 10 with residual function (rBVP)]...
March 5, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29400687/vergence-increases-the-gain-of-the-human-angular-vestibulo-ocular-reflex-during-peripheral-hyposensitivity-elicited-by-cold-thermal-irrigation
#10
László T Tamás, Yunxia W Lundberg, Béla Büki
BACKGROUND: When viewing a far target, the gain of the horizontal vestibulo-ocular reflex (VOR) is around 1.0, but when viewing a near target there is an increased response. It has been shown that while this convergence-mediated modulation is unaffected by canal plugging and clinically practical transmastoid galvanic stimulation, it is eliminated by a partial peripheral gentamicin lesion. OBJECTIVE: The aim of this study was to determine if convergence increases the gain during peripheral hyposensitivity elicited by cold thermal irrigation...
2018: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/29356863/somatosensory-modulation-of-perceptual-vestibular-detection
#11
Katerina Cabolis, Anne Steinberg, Elisa Raffaella Ferrè
Vestibular-multisensory interactions are essential for self-motion, navigation and postural stability. Despite evidence suggesting shared brain areas between vestibular and somatosensory inputs, no study has yet investigated whether somatosensory information influences vestibular perception. Here, we used signal detection methods to identify whether somatosensory stimulation might interact with vestibular events in a vestibular detection task. Participants were instructed to detect near-threshold vestibular roll-rotation sensations delivered by galvanic vestibular stimulation in one-half of experimental trials...
March 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29182659/fractal-analyses-reveal-independent-complexity-and-predictability-of-gait
#12
Frédéric Dierick, Anne-Laure Nivard, Olivier White, Fabien Buisseret
Locomotion is a natural task that has been assessed for decades and used as a proxy to highlight impairments of various origins. So far, most studies adopted classical linear analyses of spatio-temporal gait parameters. Here, we use more advanced, yet not less practical, non-linear techniques to analyse gait time series of healthy subjects. We aimed at finding more sensitive indexes related to spatio-temporal gait parameters than those previously used, with the hope to better identify abnormal locomotion. We analysed large-scale stride interval time series and mean step width in 34 participants while altering walking direction (forward vs...
2017: PloS One
https://www.readbyqxmd.com/read/29163348/intermediate-latency-evoked-potentials-of-multimodal-cortical-vestibular-areas-galvanic-stimulation
#13
Stefan Kammermeier, Arun Singh, Kai Bötzel
Introduction: Human multimodal vestibular cortical regions are bilaterally anterior insulae and posterior opercula, where characteristic vestibular-related cortical potentials were previously reported under acoustic otolith stimulation. Galvanic vestibular stimulation likely influences semicircular canals preferentially. Galvanic stimulation was compared to previously established data under acoustic stimulation. Methods: 14 healthy right-handed subjects, who were also included in the previous acoustic potential study, showed normal acoustic and galvanic vestibular-evoked myogenic potentials...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29079459/effect-of-noisy-galvanic-vestibular-stimulation-on-center-of-pressure-sway-of-static-standing-posture
#14
Yasuto Inukai, Naofumi Otsuru, Mitsuhiro Masaki, Kei Saito, Shota Miyaguchi, Sho Kojima, Hideaki Onishi
BACKGROUND: The vestibular system is involved in the control of standing balance. Galvanic vestibular stimulation (GVS) is a noninvasive technique that can stimulate the vestibular system. In recent years, noisy GVS (nGVS) using noise current stimulation has been attempted, but it has not been clarified whether it affects postural sway in open-eye standing. OBJECTIVE: The purpose of this study was to clarify the influence of nGVS on the center of pressure (COP) sway measurement in open-eye standing postural control and identify the responders of nGVS...
January 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29075558/the-medium-latency-muscle-response-to-a-vestibular-perturbation-is-increased-after-depression-of-the-cerebellar-vermis
#15
Chris K Lam, William R Staines, Craig D Tokuno, Leah R Bent
INTRODUCTION: Galvanic vestibular stimulation (GVS) is able to evoke distinct responses in the muscles used for balance. These reflexes, termed the short (SL) and medium latency (ML) responses, can be altered by sensory input; decreasing in size when additional sensory cues are available. Although much is known about these responses, the origin and role of the responses are still not fully understood. It has been suggested that the cerebellum, a structure that is involved in postural control and sensory integration, may play a role in the modulation of these reflexes...
October 2017: Brain and Behavior
https://www.readbyqxmd.com/read/29060313/galvanic-vestibular-stimulation-gvs-effects-on-impaired-interhemispheric-connectivity-in-parkinson-s-disease
#16
Soojin Lee, Diana Kim, Martin J McKeown
Disrupted interhemispheric connectivity (IHC) is being increasingly recognized as a robust feature of a number of neurological diseases, including Parkinson's Disease (PD). We investigated whether or not Galvanic Vestibular Stimulation (GVS) - a proposed treatment for PD - affected IHC in 11 PD subjects (off medication). In order to avoid the confound of stimulation artifact disrupting the EEG, we investigated the immediate period (52 sec) after stimulation (72 sec) with noisy 1/f-type GVS stimuli. Partial Least Squares (PLS) regression was used to determine the subject-specific linear combination of EEG electrodes that maximized covariance between hemispheres and then computed coherence between the dominant PLS components...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28912091/is-hippocampal-neurogenesis-modulated-by-the-sensation-of-self-motion-encoded-by-the-vestibular-system
#17
REVIEW
Paul F Smith
It is now well accepted that physical exercise stimulates hippocampal neurogenesis and may promote cognitive ability. Less clear are the mechanisms by which this process occurs. One potential contributing influence, that is usually neglected, is the vestibular system, which by its very nature must be activated during physical exercise and which essentially cannot be turned off without complete bilateral vestibular lesions. This paper reviews a small literature that demonstrates that bilateral vestibular loss (BVL) in rats modulates cell proliferation in the dentate gyrus (DG) and that artificial electrical activation of the vestibular system, using galvanic vestibular stimulation, does also...
September 11, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28833167/co-ordination-of-the-upper-and-lower-limbs-for-vestibular-control-of-balance
#18
Craig P Smith, Jonathan E Allsop, Michael Mistry, Raymond F Reynolds
KEY POINTS: When standing and holding an earth-fixed object, galvanic vestibular stimulation (GVS) can evoke upper limb responses to maintain balance. In the present study, we determined how these responses are affected by grip context (no contact, light grip and firm grip), as well as how they are co-ordinated with the lower limbs to maintain balance. When GVS was applied during firm grip, hand and ground reaction forces were generated. The directions of these force vectors were co-ordinated such that the overall body sway response was always aligned with the inter-aural axis (i...
November 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28798718/vestibular-modulation-of-sympathetic-nerve-activity-to-muscle-and-skin-in-humans
#19
REVIEW
Elie Hammam, Vaughan G Macefield
We review the existence of vestibulosympathetic reflexes in humans. While several methods to activate the human vestibular apparatus have been used, galvanic vestibular stimulation (GVS) is a means of selectively modulating vestibular afferent activity via electrodes over the mastoid processes, causing robust vestibular illusions of side-to-side movement. Sinusoidal GVS (sGVS) causes partial entrainment of sympathetic outflow to muscle and skin. Modulation of muscle sympathetic nerve activity (MSNA) from vestibular inputs competes with baroreceptor inputs, with stronger temporal coupling to the vestibular stimulus being observed at frequencies remote from the cardiac frequency; "super entrainment" was observed in some individuals...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28783491/adaptation-of-postural-recovery-responses-to-a-vestibular-sensory-illusion-in-individuals-with-parkinson-disease-and-healthy-controls
#20
Mark E Lester, James T Cavanaugh, K Bo Foreman, Scott W Shaffer, Robin Marcus, Leland E Dibble
BACKGROUND: The ability to adapt postural responses to sensory illusions diminishes with age and is further impaired by Parkinson disease. However, limited information exists regarding training-related adaptions of sensory reweighting in these populations. METHODS: This study sought to determine whether Parkinson disease or age would differentially affect acute postural recovery or adaptive postural responses to novel or repeated exposure to sensory illusions using galvanic vestibular stimulation during quiet stance...
October 2017: Clinical Biomechanics
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