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vestibular stimulation

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https://www.readbyqxmd.com/read/28061922/respiratory-and-pulse-changes-due-to-vestibular-stimulations-in-a-motion-based-simulator
#1
Savas Ilbasmis, Safak Yildiz
INTRODUCTION: One of the mechanisms leading to spatial disorientation (SD) is overstimulation of the vestibular system by various aircraft maneuvers. The objective of this study was to observe respiratory rate and pulse changes during vestibular system stimulations with the help of two selected SD training profiles. METHODS: The respiration and pulse rates of 15 subjects were recorded in response to 2 sequential SD training profiles on a motion-based simulator. The session started with a motionless instruction period (IP), continued with a Coriolis profile (CP) which stimulated the semicircular canals, and ended with a Dark Takeoff profile (DP) which stimulated the otolith organs...
January 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28054312/latent-inhibition-reduces-nocebo-nausea-even-without-deception
#2
V F Quinn, E J Livesey, B Colagiuri
BACKGROUND: Nocebo nausea is a debilitating and prevalent side effect that can develop after conditioning occurs between cues present in the treatment context and the experience of nausea. Interventions that retard conditioning may therefore be able to reduce nocebo nausea. PURPOSE: To test whether 'latent inhibition', where pre-exposing cues in the absence of an outcome retards subsequent learning about those cues, could reduce nocebo nausea in healthy adults. METHODS: We examined this possibility using a Galvanic Vestibular Stimulation (GVS) model of nausea in healthy participants, with pre-exposure to the treatment cues achieved using a placebo version of GVS...
January 4, 2017: Annals of Behavioral Medicine: a Publication of the Society of Behavioral Medicine
https://www.readbyqxmd.com/read/28050208/tonic-investigation-concept-of-cervico-vestibular-muscle-afferents
#3
Linda Josephine Dorn, Annabelle Lappat, Winfried Neuhuber, Hans Scherer, Heidi Olze, Matthias Hölzl
Introduction Interdisciplinary research has contributed greatly to an improved understanding of the vestibular system. To date, however, very little research has focused on the vestibular system's somatosensory afferents. To ensure the diagnostic quality of vestibular somatosensory afferent data, especially the extra cranial afferents, stimulation of the vestibular balance system has to be precluded. Objective Sophisticated movements require intra- and extra cranial vestibular receptors. The study's objective is to evaluate an investigation concept for cervico-vestibular afferents with respect to clinical feasibility...
January 2017: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/28045785/cold-thermal-irrigation-decreases-the-ipsilateral-gain-of-the-vestibulo-ocular-reflex
#4
Laszlo T Tamás, Konrad P Weber, Christopher J Bockisch, Dominik Straumann, David M Lasker, Béla Büki, Alexander A Tarnutzer
OBJECTIVES: During head rotations, neuronal firing rates increase in ipsilateral and decrease in contralateral vestibular afferents. At low accelerations, this "push-pull mechanism" is linear. At high accelerations, however, the change of firing rates is nonlinear in that the ipsilateral increase of firing rate is larger than the contralateral decrease. This mechanism of stronger ipsilateral excitation than contralateral inhibition during high-acceleration head rotation, known as Ewald's second law, is implemented within the nonlinear pathways...
December 27, 2016: Ear and Hearing
https://www.readbyqxmd.com/read/28039372/global-analysis-of-protein-expression-of-inner-ear-hair-cells
#5
Ann E Hickox, Ann C Y Wong, Kwang Pak, Chelsee Strojny, Miguel Ramirez, John R Yates, Allen F Ryan, Jeffrey N Savas
: The mammalian inner ear subserves auditory and vestibular sensations via highly specialized cells and proteins. Sensory receptor hair cells (HCs) are necessary for transducing mechanical inputs and stimulating sensory neurons by employing a host of known and yet unknown protein machinery. To understand the protein composition of these unique post-mitotic cells, in which irreversible protein degradation or damage can lead to impaired hearing and balance, we analyzed inner ear samples by tandem mass spectrometry to generate an unbiased, shotgun-proteomics view of protein identities and abundances...
December 30, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28032141/vestibular-control-of-standing-balance-is-enhanced-with-increased-cognitive-load
#6
Michael A McGeehan, Marjorie H Woollacott, Brian H Dalton
When cognitive load is elevated during a motor task, cortical inhibition and reaction time are increased; yet, standing balance control is often unchanged. This disconnect is likely explained by compensatory mechanisms within the balance system such as increased sensitivity of the vestibulomotor pathway. This study aimed to determine the effects of increased cognitive load on the vestibular control of standing balance. Participants stood blindfolded on a force plate with their head facing left and arms relaxed at their sides for two trials while exposed to continuous electrical vestibular stimulation (EVS)...
December 28, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27974743/high-order-synchronization-of-hair-cell-bundles
#7
Michael Levy, Adrian Molzon, Jae-Hyun Lee, Ji-Wook Kim, Jinwoo Cheon, Dolores Bozovic
Auditory and vestibular hair cell bundles exhibit active mechanical oscillations at natural frequencies that are typically lower than the detection range of the corresponding end organs. We explore how these noisy nonlinear oscillators mode-lock to frequencies higher than their internal clocks. A nanomagnetic technique is used to stimulate the bundles without an imposed mechanical load. The evoked response shows regimes of high-order mode-locking. Exploring a broad range of stimulus frequencies and intensities, we observe regions of high-order synchronization, analogous to Arnold Tongues in dynamical systems literature...
December 15, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27974448/the-inion-response-revisited-evidence-for-a-possible-cerebellar-contribution-to-vestibular-evoked-potentials-produced-by-air-conducted-sound-stimulation
#8
Neil P M Todd, Sendhil Govender, James Gordon Colebatch
This study investigated the effect of eye gaze and head position on vestibular evoked potentials (VsEPs). Head position would be expected to affect myogenic sources and eye position is known to affect ocular myogenic responses (OVEMPs), whereas a neurogenic source should behave otherwise. 11 healthy subjects were recruited and VsEPs using 72 channel EEG were recorded at a fixed intensity above the vestibular threshold. Three eye gaze and three head positions were tested (-20°, 0° and+20° to the horizontal)...
December 14, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27942898/assessment-of-endolymphatic-hydrops-and-otolith-function-in-patients-with-m%C3%A3-ni%C3%A3-re-s-disease
#9
Tomoko Okumura, Takao Imai, Yasumitsu Takimoto, Noriaki Takeda, Tadashi Kitahara, Atsuhiko Uno, Takefumi Kamakura, Yasuhiro Osaki, Yoshiyuki Watanabe, Hidenori Inohara
Ménière's disease is associated with hydrops of the inner ear endolymphatic space, and histopathologically, the cochlea and vestibule are usually involved. We used gadolinium-enhanced magnetic resonance imaging and measured cervical and ocular vestibular evoked myogenic potentials and the gain in the utricular induced linear vestibulo-ocular reflex to test the hypothesis that vestibular hydrops in Ménière's disease patients is associated with otolith organ dysfunction. We evaluated 21 patients diagnosed with unilateral definitive Ménière's disease using gadolinium magnetic resonance imaging to detect endolymphatic hydrops in the cochlea and vestibule...
December 10, 2016: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27869225/noisy-galvanic-vestibular-stimulation-induces-a-sustained-improvement-in-body-balance-in-elderly-adults
#10
Chisato Fujimoto, Yoshiharu Yamamoto, Teru Kamogashira, Makoto Kinoshita, Naoya Egami, Yukari Uemura, Fumiharu Togo, Tatsuya Yamasoba, Shinichi Iwasaki
Vestibular dysfunction causes postural instability, which is prevalent in the elderly. We previously showed that an imperceptible level of noisy galvanic vestibular stimulation (nGVS) can improve postural stability in patients with bilateral vestibulopathy during the stimulus, presumably by enhancing vestibular information processing. In this study, we investigated the after-effects of an imperceptible long-duration nGVS on body balance in elderly adults. Thirty elderly participants underwent two nGVS sessions in a randomised order...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27847985/acute-peripheral-vestibular-deficit-increases-redundancy-in-random-number-generation
#11
Ivan Moser, Dominique Vibert, Marco D Caversaccio, Fred W Mast
Unilateral peripheral vestibular deficit leads to broad cognitive difficulties and biases in spatial orientation. More specifically, vestibular patients typically show a spatial bias toward their affected ear in the subjective visual vertical, head and trunk orientation, fall tendency, and walking trajectory. By means of a random number generation task, we set out to investigate how an acute peripheral vestibular deficit affects the mental representation of numbers in space. Furthermore, the random number generation task allowed us to test if patients with peripheral vestibular deficit show evidence of impaired executive functions while keeping the head straight and while performing active head turns...
November 15, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27821579/cross-modal-attention-effects-in-the-vestibular-cortex-during-attentive-tracking-of-moving-objects
#12
Sebastian M Frank, Liwei Sun, Lisa Forster, Peter U Tse, Mark W Greenlee
: The midposterior fundus of the Sylvian fissure in the human brain is central to the cortical processing of vestibular cues. At least two vestibular areas are located at this site: the parietoinsular vestibular cortex (PIVC) and the posterior insular cortex (PIC). It is now well established that activity in sensory systems is subject to cross-modal attention effects. Attending to a stimulus in one sensory modality enhances activity in the corresponding cortical sensory system, but simultaneously suppresses activity in other sensory systems...
December 14, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27820972/effects-of-repetitive-galvanic-vestibular-stimulation-on-spatial-neglect-and-verticality-perception-a-randomised-sham-controlled-trial
#13
Katharina Volkening, Georg Kerkhoff, Ingo Keller
Recent evidence shows that bipolar galvanic vestibular stimulation (GVS) with the cathode on the left (CL) or right (CR) mastoid ameliorates spatial neglect, extinction and verticality perception transiently and partly permanently. However, no randomised controlled trial evaluated the long-term effects of repetitive GVS in comparison to sham-GVS on exploration and verticality perception. To compare the effects of CL-GVS, CR-GVS and Sham-GVS on spatial exploration and verticality perception in right-hemispheric stroke patients with left neglect we conducted a randomised controlled trial with minimisation...
November 7, 2016: Neuropsychological Rehabilitation
https://www.readbyqxmd.com/read/27799703/effects-of-galvanic-vestibular-stimulation-on-event-related-potentials
#14
Jeong-Woo Lee, Woong-Sik Park, Se-Won Yoon
[Purpose] The purpose of this study was to examine the effects of galvanic vestibular stimulation on event-related potentials. [Subjects and Methods] Forty normal female adult subjects were randomly distributed to a galvanic vestibular stimulation application group (20 subjects) and sham group (20 subjects). For galvanic vestibular stimulation application, a positive electrode was applied to the right mastoid process, and a negative electrode was applied to the left mastoid process; simulation was applied for 10 minutes...
September 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27777829/non-invasive-neuromodulation-using-time-varying-caloric-vestibular-stimulation
#15
Robert D Black, Lesco L Rogers, Kristen K Ade, Heather A Nicoletto, Heather D Adkins, Daniel T Laskowitz
Caloric vestibular stimulation (CVS) to elicit the vestibulo-ocular reflex has long been used in clinical settings to aid in the diagnosis of balance disorders and to confirm the absence of brainstem function. While a number of studies have hinted at the potential therapeutic applications of CVS, the limitations of existing devices have frustrated that potential. Current CVS irrigators use water or air during short-duration applications; however, this approach is not tenable for longer duration therapeutic protocols or home use...
2016: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/27773480/effects-of-the-stimulus-phase-on-the-air-conducted-ocular-vestibular-evoked-myogenic-potential-in-healthy-subjects
#16
Fernanda Emanuelle Almeida Castro Amorim, Alinne Martiniano Sahdo, Lydia Maria Pereira Giuliano, Denise Spinola Pinheiro, Nadia Iandoli de Oliveira Braga, Gilberto Mastrocola Manzano
OBJECTIVE: The study aimed to examine the effect of the stimulus phase of air-conducted sound on ocular vestibular evoked myogenic potentials (oVEMPs). METHODS: oVEMPs were recorded after air-conducted sounds (500Hz, 4ms duration), presented with initial condensation (positive), rarefaction (negative), and alternant polarities from 12 healthy subjects. RESULTS: Most responses showed a bifid n10 peak separated by ∼1.9ms. The most prominent sub-peak after condensation was shorter than the most prominent sub-peak after rarefaction; however, the first sub-peak was shorter after the rarefaction stimuli...
January 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27760820/vestibular-implants-studied-in-animal-models-clinical-and-scientific-implications
#17
REVIEW
Richard F Lewis
Damage to the peripheral vestibular system can result in debilitating postural, perceptual, and visual symptoms. A potential new treatment for this clinical problem is to replace some aspects of peripheral vestibular function with an implant that senses head motion and provides this information to the brain by stimulating branches of the vestibular nerve. In this review I consider animal studies performed at our institution over the past 15 years, which have helped elucidate how the brain processes information provided by a vestibular (semicircular canal) implant and how this information could be used to improve the problems experienced by patients with peripheral vestibular damage...
December 1, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27755361/tinnitus-suppression-after-auditory-brainstem-implantation-in-patients-with-neurofibromatosis-type-2
#18
Daniel S Roberts, Steve Otto, Brian Chen, Kevin A Peng, Marc S Schwartz, Derald E Brackmann, John W House
OBJECTIVE: To evaluate whether an auditory brainstem implant (ABI) can impact levels of tinnitus in neurofibromatosis type-2 (NF2) patients who have undergone translabyrinthine craniotomy for vestibular schwannoma (VS) removal and to evaluate the burden of tinnitus in these patients. STUDY DESIGN: A retrospective case series and patient survey. SETTING: Tertiary neurotologic referral center. PATIENTS: NF2 patients who underwent translabyrinthine removal of VS and ABI placement between 1994 and 2015...
January 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/27752729/vision-can-recalibrate-the-vestibular-reafference-signal-used-to-re-establish-postural-equilibrium-following-a-platform-perturbation
#19
Adam J Toth, Laurence R Harris, John Zettel, Leah R Bent
Visuo-vestibular recalibration, in which visual information is used to alter the interpretation of vestibular signals, has been shown to influence both oculomotor control and navigation. Here we investigate whether vision can recalibrate the vestibular feedback used during the re-establishment of equilibrium following a perturbation. The perturbation recovery responses of nine participants were examined following exposure to a period of 11 s of galvanic vestibular stimulation (GVS). During GVS in VISION trials, occlusion spectacles provided 4 s of visual information that enabled participants to correct for the GVS-induced tilt and associate this asymmetric vestibular signal with a visually provided 'upright'...
October 17, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27739939/intraoperative-auditory-steady-state-monitoring-during-surgery-in-the-cerebellopontine-angle-for-estimation-of-postoperative-hearing-classes
#20
Stefan Rampp, Leonhard Rensch, Sebastian Simmermacher, Torsten Rahne, Christian Strauss, Julian Prell
OBJECTIVE Brainstem auditory evoked potentials (BAEPs) have been used for intraoperative monitoring of the auditory nerve for many years. However, BAEPs yield limited information about the expected postoperative hearing quality and speech perception. The auditory steady-state response (ASSR) enables objective audiograms to be obtained in patients under anesthesia. These ASSRs could be used for intraoperative estimation of hearing classes to improve the postoperative outcome and quality of life. Studies investigating the clinical use of ASSRs during total intravenous anesthesia are currently lacking...
October 14, 2016: Journal of Neurosurgery
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