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https://www.readbyqxmd.com/read/28813578/incomitance-and-eye-dominance-in-intermittent-exotropia
#1
Daniel L Adams, John R Economides, Jonathan C Horton
Purpose: To determine if the deviation angle changes in subjects with intermittent exotropia as they alternate fixation between the right and left eye in primary gaze. Methods: In this prospective observational cohort study, 37 subjects with intermittent exotropia were tested for evidence of incomitance. The position of each eye was recorded with a video tracker during fixation on a small central target. A cover-uncover test was performed by occluding one eye with a shutter that passed infrared light, allowing continuous tracking of both eyes...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28795949/a-comprehensive-gaze-stabilization-controller-based-on-cerebellar-internal-models
#2
Lorenzo Vannucci, Egidio Falotico, Silvia Tolu, Vito Cacucciolo, Paolo Dario, Henrik Hautop Lund, Cecilia Laschi
Gaze stabilization is essential for clear vision; it is the combined effect of two reflexes relying on vestibular inputs: the vestibulocollic reflex (VCR), which stabilizes the head in space and the vestibulo-ocular reflex (VOR), which stabilizes the visual axis to minimize retinal image motion. The VOR works in conjunction with the opto-kinetic reflex (OKR), which is a visual feedback mechanism that allows to move the eye at the same speed as the observed scene. Together they keep the image stationary on the retina...
August 10, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28790966/randomized-controlled-study-of-a-remote-flipped-classroom-neuro-otology-curriculum
#3
Frederick Robert Carrick, Mahera Abdulrahman, Ahmed Hankir, Maksim Zayaruzny, Kinda Najem, Palita Lungchukiet, Roger A Edwards
CONTEXT: Medical Education can be delivered in the traditional classroom or via novel technology including an online classroom. OBJECTIVE: To test the hypothesis that learning in an online classroom would result in similar outcomes as learning in the traditional classroom when using a flipped classroom pedagogy. DESIGN: Randomized controlled trial. A total of 274 subjects enrolled in a Neuro-otology training program for non-Neuro-otologists of 25 h held over a 3-day period...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28709904/the-effects-of-gaze-stabilization-on-gait-parameters-in-individuals-with-parkinson-s-disease
#4
Rebecca J Reed-Jones, Douglas W Powell
The purpose of this study was to examine the effects of gaze fixation on head stabilization and gait during straight over ground walking in individuals with Parkinson's disease (PD). Eight individuals with PD (Age: 62.3±8.1 years) volunteered for the study. Full body kinematic data were collected at 120Hz using a Vicon motion capture system. Two visual conditions were used to determine the effects of gaze fixation: FREE gaze and FIXED gaze. During FIXED gaze, participants were required to fixate on a still target 13m ahead...
August 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28698242/abnormal-fixational-eye-movements-in-strabismus
#5
Fatema F Ghasia, Jorge Otero-Millan, Aasef G Shaikh
INTRODUCTION: Fixational saccades are miniature eye movements that constantly change the gaze during attempted visual fixation. Visually guided saccades and fixational saccades represent an oculomotor continuum and are produced by common neural machinery. Patients with strabismus have disconjugate binocular horizontal saccades. We examined the stability and variability of eye position during fixation in patients with strabismus and correlated the severity of fixational instability with strabismus angle and binocular vision...
July 11, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28681089/a-novel-test-for-evaluating-horses-spontaneous-visual-attention-is-predictive-of-attention-in-operant-learning-tasks
#6
C Rochais, M Sébilleau, M Houdebine, P Bec, M Hausberger, S Henry
Attention is described as the ability to process selectively one aspect of the environment over others. In this study, we characterized horses' spontaneous attention by designing a novel visual attention test (VAT) that is easy to apply in the animal's home environment. The test was repeated over three consecutive days and repeated again 6 months later in order to assess inter-individual variations and intra-individual stability. Different patterns of attention have been revealed: 'overall' attention when the horse merely gazed at the stimulus and 'fixed' attention characterized by fixity and orientation of at least the visual and auditory organs towards the stimulus...
August 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28640006/poor-gait-performance-is-influenced-with-decreased-vestibulo-ocular-reflex-in-poststroke-patients
#7
Tsubasa Mitsutake, Maiko Sakamoto, Kozo Ueta, Shinichiro Oka, Etsuo Horikawa
The vestibulo-ocular reflex (VOR) exerts a significant influence on gait performance. Therefore, a decrease in VOR function could worsen gait impairments in patients with poststroke hemiparesis. The effects of decreased VOR function on gait performance could be further exacerbated by aging-related physical weakness and impaired motor function of the hemiparetic lower limb. The aim of our study was to evaluate the possible synergistic effect of aging and impairment in lower extremity function and the VOR on walking ability of poststroke hemiplegic patients...
August 16, 2017: Neuroreport
https://www.readbyqxmd.com/read/28601564/angle-of-gaze-and-optic-flow-direction-modulate-body-sway
#8
Milena Raffi, Alessandro Piras, Michela Persiani, Monica Perazzolo, Salvatore Squatrito
Optic flow is a crucial signal in maintaining postural stability. We sought to investigate whether the activity of postural muscles and body sway was modulated by eye position during the view of radial optic flow stimuli. We manipulated the spatial distribution of dot speed and the fixation point position to simulate specific heading directions combined with different gaze positions. The experiments were performed using stabilometry and surface electromyography (EMG) on 24 right-handed young, healthy volunteers...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28593438/eye-movements-are-correctly-timed-during-walking-despite-bilateral-vestibular-hypofunction
#9
Eric R Anson, Tim Kiemel, John P Carey, John J Jeka
Individuals with bilateral vestibular hypofunction (BVH) often report symptoms of oscillopsia (the perception that the world is bouncing or unstable) during walking. Efference copy/proprioception contributes to locomotion gaze stability in animals, sometimes inhibiting the vestibulo-ocular reflex (VOR). Gaze stability requires both adequate eye velocity and appropriate timing of eye movements. It is unknown whether eye velocity (VOR gain), timing (phase), or both are impaired for individuals with BVH during walking...
August 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/28542112/effects-of-vestibular-rehabilitation-on-gait-performance-in-poststroke-patients-a-pilot-randomized-controlled-trial
#10
Tsubasa Mitsutake, Maiko Sakamoto, Kozo Ueta, Shinichiro Oka, Etsuo Horikawa
The effects of vestibular rehabilitation on poststroke patients are unknown. This study aimed to investigate whether or not vestibular rehabilitation would improve both the vestibulo-ocular reflex and gait performance of patients with poststroke hemiparesis. Twenty-eight patients with stroke were assigned randomly to either an experimental group (N=14) or a control group (N=14). The experimental group performed the conventional physical therapy for 40 min and vestibular rehabilitation for 20 min, as a 60 min session, during the first 3 weeks and then completed only the conventional intervention for 60 min for the following 3 weeks...
May 24, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28499856/measuring-soldier-performance-during-the-patrol-exertion-multitask-preliminary-validation-of-a-post-concussive-functional-return-to-duty-metric
#11
Matthew Scherer, Margaret M Weightman, Mary Vining Radomski, Laurel Smith, Marsha Finkelstein, Amy Cecchini, Kristin Jensen Heaton, Karen McCulloch
OBJECTIVE: To assess the discriminant validity of the Patrol-Exertion Multitask (PEMT), a novel, multi-domain, functional return-to-duty clinical assessment for Active Duty military personnel. DESIGN: Measurement development study SETTING: Non-clinical indoor testing facility, Fort Bragg NC PARTICIPANTS: 51 healthy control (HC) Service Members and 33 military personnel with persistent post-concussive symptoms receiving rehabilitation (mTBI) INTERVENTION: Not applicable MAIN OUTCOME MEASURES: Known-groups discriminant validity was evaluated by comparing performance on the PEMT in two groups of Active Duty SM, HC and personnel with mTBI residual symptoms...
May 9, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28446583/a-shared-neural-integrator-for-human-posture-control
#12
S E Haggerty, A R Wu, K H Sienko, A D Kuo
Control of standing posture requires fusion of multiple inputs including visual, vestibular, somatosensory, and other sensors, each having distinct dynamics. The semicircular canals, for example, have a unique high-pass filter response to angular velocity, quickly sensing a step change in head rotational velocity followed by a decay. To stabilize gaze direction despite this decay, the central nervous system supplies a neural "velocity storage" integrator, a filter that extends the angular velocity signal. Similar filtering might contribute temporal dynamics to posture control, as suggested by some state estimation models...
August 1, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28424915/optimal-eye-movement-strategies-a-comparison-of-neurosurgeons-gaze-patterns-when-using-a-surgical-microscope
#13
Shahram Eivazi, Ahmad Hafez, Wolfgang Fuhl, Hoorieh Afkari, Enkelejda Kasneci, Martin Lehecka, Roman Bednarik
BACKGROUND: Previous studies have consistently demonstrated gaze behaviour differences related to expertise during various surgical procedures. In micro-neurosurgery, however, there is a lack of evidence of empirically demonstrated individual differences associated with visual attention. It is unknown exactly how neurosurgeons see a stereoscopic magnified view in the context of micro-neurosurgery and what this implies for medical training. METHOD: We report on an investigation of the eye movement patterns in micro-neurosurgery using a state-of-the-art eye tracker...
June 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28421028/adult-onset-niemann-pick-disease-type-c-rapid-treatment-initiation-advised-but-early-diagnosis-remains-difficult
#14
Tobias Piroth, Kai Boelmans, Florian Amtage, Michel Rijntjes, Anna Wierciochin, Thomas Musacchio, Cornelius Weiller, Jens Volkmann, Stephan Klebe
Niemann-Pick type C disease (NP-C) presents with heterogeneous neurological and psychiatric symptoms. Adult onset is rare and possibly underdiagnosed due to frequent lack of specific and obvious key symptoms. For both early and adolescent/adult onset, the available data from studies and case reports describe a positive effect of Miglustat (symptom relief or stabilization). However, due to the low frequency of NP-C, experience with this therapy is still limited. We describe two adult-onset cases of NP-C. In both cases, vertical supranuclear gaze palsy was not recognized at symptom onset...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28404827/new-insights-into-vestibular-saccade-interaction-based-on-covert-corrective-saccades-in-patients-with-unilateral-vestibular-deficits
#15
Paolo Colagiorgio, Maurizio Versino, Silvia Colnaghi, Silvia Quaglieri, Marco Manfrin, Ewa Zamaro, Georgios Mantokoudis, David S Zee, Stefano Ramat
In response to passive high-acceleration head impulses, patients with low vestibulo-ocular reflex (VOR) gains often produce covert (executed while the head is still moving) corrective saccades in the direction of deficient slow phases. Here we examined 23 patients using passive, and 9 also active, head impulses with acute (< 10 days from onset) unilateral vestibular neuritis and low VOR gains. We found that when corrective saccades are larger than 10°, the slow-phase component of the VOR is inhibited, even though inhibition increases further the time to reacquire the fixation target...
June 1, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28391373/noisy-galvanic-vestibular-stimulation-an-emerging-treatment-option-for-bilateral-vestibulopathy
#16
Max Wuehr, Julian Decker, Roman Schniepp
Patients with bilateral vestibulopathy (BVP) suffer from persistent imbalance during standing and walking as well as an impaired gaze stabilization during head movements. Disabilities associated with BVP severely compromise patients' daily activities and are often linked to an increased risk of falls. Currently, the only established treatment option in BVP is physical therapy. However, treatment effects of physical therapy in BVP are most often limited and many patients do not adequately recover performance...
April 8, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28387693/visual-vestibular-processing-deficits-in-mild-traumatic-brain-injury
#17
W G Wright, R T Tierney, J McDevitt
BACKGROUND: The search for reliable and valid signs and symptoms of mild traumatic brain injury (mTBI), commonly synonymous with concussion, has lead to a growing body of evidence that individuals with long-lasting, unremitting impairments often experience visual and vestibular symptoms, such as dizziness, postural and gait disturbances. OBJECTIVE: Investigate the role of visual-vestibular processing deficits following concussion. METHODS: A number of clinically accepted vestibular, oculomotor, and balance assessments as well as a novel virtual reality (VR)-based balance assessment device were used to assess adults with post-acute concussion (n = 14) in comparison to a healthy age-matched cohort (n = 58)...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28387690/the-vestibular-implant-a-probe-in-orbit-around-the-human-balance-system
#18
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/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...
June 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28385683/the-multimodal-assessment-of-adult-attachment-security-developing-the-biometric-attachment-test
#20
Federico Parra, Raphaële Miljkovitch, Gwenaelle Persiaux, Michelle Morales, Stefan Scherer
BACKGROUND: Attachment theory has been proven essential for mental health, including psychopathology, development, and interpersonal relationships. Validated psychometric instruments to measure attachment abound but suffer from shortcomings common to traditional psychometrics. Recent developments in multimodal fusion and machine learning pave the way for new automated and objective psychometric instruments for adult attachment that combine psychophysiological, linguistic, and behavioral analyses in the assessment of the construct...
April 6, 2017: Journal of Medical Internet Research
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