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https://www.readbyqxmd.com/read/28516967/body-worn-triaxial-accelerometer-coherence-and-reliability-related-to-static-posturography-in-unilateral-vestibular-failure
#1
M Alessandrini, A Micarelli, A Viziano, I Pavone, G Costantini, D Casali, F Paolizzo, G Saggio
Since changes in vestibular function may be one cause of disequilibrium, major advances in measuring postural control and sensory integration in vestibular impairments have been achieved by using posturography. However, in order to overcome problems related to this type of technology, body-worn accelerometers (ACC) have been proposed as a portable, low-cost alternative to posturography for measurements of postural sway in a friendly and ecologic environment. Due to the fact that no study to date has shown the experimental validity of ACC-based measures of body sway with respect to posturography for subjects with vestibular deficits, the aim of the present study was: i) to develop and validate a practical tool that can allow clinicians to measure postural sway derangements in an otoneurological setting by ACC, and ii) to provide reliable, sensitive and accurate automatic analysis of sway that could help in discriminating unilateral vestibular failure (UVF) patients...
June 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28515458/floccular-fossa-size-is-not-a-reliable-proxy-of-ecology-and-behaviour-in-vertebrates
#2
S Ferreira-Cardoso, R Araújo, N E Martins, G G Martins, S Walsh, R M S Martins, N Kardjilov, I Manke, A Hilger, R Castanhinha
The cerebellar floccular and parafloccular lobes are housed in fossae of the periotic region of the skull of different vertebrates. Experimental evidence indicates that the lobes integrate visual and vestibular information and control the vestibulo-ocular reflex, vestibulo-collic reflex, smooth pursuit and gaze holding. Multiple paleoneuroanatomy studies have deduced the behaviour of fossil vertebrates by measuring the floccular fossae (FF). These studies assumed that there are correlations between FF volume and behaviour...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28485669/postural-stability-in-a-population-of-dancers-healthy-non-dancers-and-vestibular-neuritis-patients
#3
Eduardo Martin-Sanz, Isabel Ortega Crespo, Jonathan Esteban-Sanchez, Ricardo Sanz
INTRODUCTION: Several studies have indicated better balance control in dancers than in control participants, but some controversy remains. The aim of our study is to evaluate the postural stability in a cohort of dancers, non-dancers, compensated, and non-compensated unilateral vestibular neuritis (VN). METHODS: This is a prospective study of control subjects, dancers, and VN patients between June 2009 and December 2015. Dancers from the Dance Conservatory of Madrid and VN patients were referred to our department for analysis...
May 9, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28484380/perceived-intensity-and-discrimination-ability-for-lingual-electrotactile-stimulation-depends-on-location-and-orientation-of-electrodes
#4
Joel Moritz, Philip Turk, John D Williams, Leslie M Stone-Roy
Malfunctioning sensory systems can severely impact quality of life and repair is not always possible. One solution, called sensory substitution, is to use another sensory system to bring lost information to the brain. This approach often involves the use of bioengineered devices that electrically stimulate somatosensory fibers. Interestingly, the tongue is an ideal location for electrotactile stimulation due to its dense innervation, moisture, and protected environment. Success with transmitting visual and vestibular information through the tongue indicates promise for future applications...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28471720/effects-of-mechanical-trauma-to-the-human-tympanic-membrane-an-experimental-study-using-transmission-electron-microscopy
#5
Nadine Schart-Morén, Paula Mannström, Helge Rask-Andersen, Magnus von Unge
HYPOTHESIS: To examine the cellular events following induced superficial lesions of the human tympanic membrane (TM). Such information could lead to enhanced appreciation of repair mechanisms and novel strategies to restore TM perforations. BACKGROUND: Persistent perforation of the TM in chronic otitis media is a major global health problem and frequently necessitates surgical intervention. Most TM perforations heal spontaneously and swiftly, but sometimes healing fails...
May 4, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28467328/posture-and-posturology-anatomical-and-physiological-profiles-overview-and-current-state-of-art
#6
Francesco Carini, Margherita Mazzola, Chiara Fici, Salvatore Palmeri, Massimo Messina, Provvidenza Damiani, Giovanni Tomasello
BACKGROUND AND AIM OF WORK: posture is the position of the body in the space, and is controlled by a set of anatomical structures. The maintenance and the control of posture are a set of interactions between muscle-skeletal, visual, vestibular, and skin system. Lately there are numerous studies that correlate the muscle-skeletal and the maintenance of posture. In particular, the correction of defects and obstruction of temporomandibular disorders, seem to have an impact on posture. The aim of this work is to collect information in literature on posture and the influence of the stomatognathic system on postural system...
April 28, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28446678/differential-involvement-during-latent-hsv-1-infection-of-the-superior-and-inferior-divisions-of-the-vestibular-ganglia-implications-for-vestibular-neuritis
#7
Susanne Himmelein, Anja Lindemann, Inga Sinicina, Anja K E Horn, Thomas Brandt, Michael Strupp, Katharina Hüfner
Controversy still surrounds both the etiology and pathophysiology of vestibular neuritis (VN). Especially uncertain is why the superior vestibular nerve (SVN) is more frequently affected than the inferior part (IVN), which is partially or totally spared. To address this question we developed an improved method for preparing human vestibular ganglia (VG) and nerve. Subsequently macro- and micro-anatomical as well as PCR studies were performed on 38 human ganglia from 38 individuals. The SVN was 2.4 mm longer than the IVN, and in 65% of the cases the IVN ran in two separate bony canals, which was not the case for the SVN...
April 26, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28444617/computational-theory-underlying-acute-vestibulo-ocular-reflex-motor-learning-with-cerebellar-long-term-depression-and-long-term-potentiation
#8
Keiichiro Inagaki, Yutaka Hirata
The vestibulo-ocular reflex (VOR) can be viewed as an adaptive control system that maintains compensatory eye movements during head motion. As the cerebellar flocculus is intimately involved in this adaptive motor control of the VOR, the VOR has been a popular model system for investigating cerebellar motor learning. Long-term depression (LTD) and long-term potentiation (LTP) at the parallel fiber-Purkinje cell synapses are considered to play major roles in cerebellar motor learning. A recent study using mutant mice demonstrated cerebellar motor learning with hampered LTD; the study concluded that the parallel fiber-Purkinje cell LTD is not essential...
April 25, 2017: Cerebellum
https://www.readbyqxmd.com/read/28443004/assessing-somatosensory-utilization-during-unipedal-postural-control
#9
Rahul Goel, Yiri E De Dios, Nichole E Gadd, Erin E Caldwell, Brian T Peters, Millard F Reschke, Jacob J Bloomberg, Lars I E Oddsson, Ajitkumar P Mulavara
Multisensory-visual, vestibular and somatosensory information is integrated for appropriate postural control. The primary goal of this study was to assess somatosensory utilization during a functional motor task of unipedal postural control, in normal healthy adults. Assessing individual bias in the utilization of individual sensory contributions during postural control may help customization of rehabilitation protocols. In this study, a test paradigm of unipedal stance control in supine orientation with and without vision was assessed...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28436631/-video-head-impulse-test-for-evaluation-of-vestibular-function-in-patients-with-vestibular-neuritis-and-benign-paroxysmal-positional-vertigo
#10
Qiongfeng Guan, Lisan Zhang, Wenke Hong, Yi Yang, Zhaoying Chen, Dan Zhang, Xingyue Hu
Objective: To assess the clinical application of video head impulse test (vHIT) for vestibular function in vestibular neuritis (VN) and benign paroxysmal positional vertigo (BPPV) patients. Methods: Thirty-three patients with VN and 43 patients with BPPV were enrolled from Sir Run Run Shaw Hospital and Ningbo Second Hospital from March 15 to September 10, 2015; and 50 healthy controls were also enrolled in the study. vHIT was used to quantitatively test the vestibulo-ocular reflex (VOR) gains of a pair of horizontal semicircular canals...
January 25, 2017: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/28422031/the-importance-of-labyrinthine-examination-in-the-prognosis-and-therapy-for-balance-in-spinocerebellar-ataxia
#11
João Henrique Faryniuk, Bianca Simone Zeigelboim, Hélio Afonso Ghizoni Teive, Vinicius Ribas Fo, Paulo Breno Noronha Liberalesso, Jair Mendes Marques
INTRODUCTION: Spinocerebellar ataxias (SCAs) are a heterogeneous group of neurodegenerative diseases that are characterized by the presence of progressive cerebellar ataxia. OBJECTIVE: Identify vestibular disorders and demonstrate the importance of labyrinthine examination in the prognosis and therapy for balance in patients with SCAs. MATERIALS AND METHODS: The study had a retrospective cross-sectional design and evaluated 57 patients, mean age of 41...
April 19, 2017: International Tinnitus Journal
https://www.readbyqxmd.com/read/28421873/facial-alveolar-bone-width-at-the-first-and-second-maxillary-premolars-in-healthy-patients-a-cone-beam-computed-tomography-study
#12
Julio Rojo, José Viña, David Peñarrocha, Miguel Peñarrocha
The purpose was to analyze the thickness of the facial alveolar bone at the first and second maxillary premolars and determinate the percentage of premolars that reached 2 mm in width. A retrospective study analyzing cone beam computed tomography scans from the database of the Oral Surgery Unit of the University of Valencia was performed. Patients with periodontal disease, orthodontic treatment, absence among the first maxillary molars, premolars with endodontic treatment and/or prosthetic restorations were excluded...
April 19, 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28399681/older-adults-experiences-of-internet-based-vestibular-rehabilitation-for-dizziness-a-longitudinal-study
#13
Rosie Essery, Sarah Kirby, Adam W A Geraghty, Lucy Yardley
OBJECTIVE: Factors influencing engagement with self-managed rehabilitation are not well understood, but evidence suggests they may change over time. Despite increasing digitalisation of self-managed interventions, little is known about the role of internet-based interventions in patients' experiences of self-directed rehabilitation. This longitudinal qualitative study investigated individuals' ongoing experiences of internet-guided, self-managed rehabilitation within the context of rehabilitation for dizziness...
April 11, 2017: Psychology & Health
https://www.readbyqxmd.com/read/28397001/gait-ataxia-in-humans-vestibular-and-cerebellar-control-of-dynamic-stability
#14
Roman Schniepp, Ken Möhwald, Max Wuehr
During human locomotion, vestibular feedback control is fundamental for maintaining dynamic stability and adapting the gait pattern to external circumstances. Within the supraspinal locomotor network, the cerebellum represents the key site for the integration of vestibular feedback information. The cerebellum is further important for the fine-tuning and coordination of limb movements during walking. The aim of this review article is to highlight the shared structural and functional sensorimotor principles in vestibular and cerebellar locomotion control...
April 10, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28387690/the-vestibular-implant-a-probe-in-orbit-around-the-human-balance-system
#15
Angelica Perez Fornos, Samuel Cavuscens, Maurizio Ranieri, Raymond van de Berg, Robert Stokroos, Herman Kingma, Jean-Philippe Guyot, Nils Guinand
The primary goal of the vestibular implant is to restore the vestibular function in patients with a disabling bilateral vestibular loss for whom there is currently no available treatment. The prototype developed by our team is a hybrid system consisting of a modified cochlear implant incorporating additional vestibular electrodes. Therefore, in addition of delivering sound information it is also capable of delivering motion information to the central nervous system using electrical stimulation. To date, thirteen patients have been implanted with such vestibular implant prototypes...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28387689/multisensory-control-of-a-straight-locomotor-trajectory
#16
Maxim Hanna, Joyce Fung, Anouk Lamontagne
Locomotor steering is contingent upon orienting oneself spatially in the environment. When the head is turned while walking, the optic flow projected onto the retina is a complex pattern comprising of a translational and a rotational component. We have created a unique paradigm to simulate different optic flows in a virtual environment. We hypothesized that non-visual (vestibular and somatosensory) cues are required for proper control of a straight trajectory while walking. This research study included 9 healthy young subjects walking in a large physical space (40×25m2) while the virtual environment is viewed in a helmet-mounted display...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28387688/using-visual-stimuli-to-enhance-gait-control
#17
Christopher K Rhea, Nikita A Kuznetsov
Gait control challenges commonly coincide with vestibular dysfunction and there is a long history in using balance and gait activities to enhance functional mobility in this population. While much has been learned using traditional rehabilitation exercises, there is a new line of research emerging that is using visual stimuli in a very specific way to enhance gait control. For example, avatars can be created in an individualized manner to incorporate specific gait characteristics. The avatar could then be used as a visual stimulus to which the patient can synchronize their own gait cycle...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28387548/review-of-vestibular-and-oculomotor-screening-and-concussion-rehabilitation
#18
Anthony P Kontos, Jamie McAllister Deitrick, Michael W Collins, Anne Mucha
Vestibular and oculomotor impairment and symptoms may be associated with worse outcomes after sport-related concussion (SRC), including prolonged recovery. In this review, we evaluate current findings on vestibular and oculomotor impairments as well as treatment approaches after SRC, and we highlight areas in which investigation is needed. Clinical researchers have intimated that recovery from SRC may follow certain clinical profiles that affect the vestibular and oculomotor pathways. Identifying clinical profiles may help to inform better treatment and earlier intervention to reduce recovery time after SRC...
March 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28385799/cross-modal-influence-of-mechanosensory-input-on-gaze-responses-to-visual-motion-in-drosophila
#19
Shwetha Mureli, Ilakkiya Thanigaivelan, Michael L Schaffer, Jessica L Fox
Animals typically combine inertial and visual information to stabilize their gaze against confounding self-generated visual motion, and to maintain a level gaze when the body is perturbed by external forces. In vertebrates, an inner ear vestibular system provides information about body rotations and accelerations, but gaze stabilization is less understood in insects, which lack a vestibular organ. In flies, the halteres, reduced hindwings imbued with hundreds of mechanosensory cells, sense inertial forces and provide input to neck motoneurons that control gaze...
April 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28361254/vestibular-cognition-the-effect-of-prior-belief-on-vestibular-perceptual-decision-making
#20
Andrew W Ellis, Manuel P Klaus, Fred W Mast
Vestibular cognition is a growing field of interest and relatively little is known about the underlying mechanisms. We tested the effect of prior beliefs about the relative probability (50:50 vs. 80:20) of motion direction (yaw rotation) using a direction discrimination task. We analyzed choices individually with a logistic regression model and together with response times using a cognitive process model. The results show that self-motion perception is altered by prior belief, leading to a shift of the psychometric function, without a loss of sensitivity...
March 30, 2017: Journal of Neurology
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