keyword
MENU ▼
Read by QxMD icon Read
search

gaze stabilization

keyword
https://www.readbyqxmd.com/read/27877114/ontogenetic-development-of-vestibulo-ocular-reflexes-in-amphibians
#1
REVIEW
Francisco Branoner, Boris P Chagnaud, Hans Straka
Vestibulo-ocular reflexes (VOR) ensure gaze stability during locomotion and passively induced head/body movements. In precocial vertebrates such as amphibians, vestibular reflexes are required very early at the onset of locomotor activity. While the formation of inner ears and the assembly of sensory-motor pathways is largely completed soon after hatching, angular and translational/tilt VOR display differential functional onsets and mature with different time courses. Otolith-derived eye movements appear immediately after hatching, whereas the appearance and progressive amelioration of semicircular canal-evoked eye movements is delayed and dependent on the acquisition of sufficiently large semicircular canal diameters...
2016: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/27874249/role-of-neural-integrators-in-oculomotor-systems-a%C3%A2-systematic-narrative-literature-review
#2
REVIEW
Katherine Sanchez, Fiona J Rowe
PURPOSE: To evaluate the role of neural integrators (NI) in the oculomotor system. METHODS: A literature search was carried out using several electronic databases during the months of June 2014 to March 2015. The following keywords were used to generate focused results: 'neural integrators', 'gaze-holding', 'oculomotor integration', 'impaired gaze-holding', 'gaze evoked nystagmus' and 'gaze dysfunction'. Further materials were found through searching relevant articles within reference lists...
November 22, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27864084/development-and-regeneration-of-vestibular-hair-cells-in-mammals
#3
REVIEW
Joseph Burns, Jennifer Stone
Vestibular sensation is essential for gaze stabilization, balance, and perception of gravity. The vestibular receptors in mammals, Type I and Type II hair cells, are located in five small organs in the inner ear. Damage to hair cells and their innervating neurons can cause crippling symptoms such as vertigo, visual field oscillation, and imbalance. In adult rodents, some Type II hair cells are regenerated and become re-innervated after damage, presenting opportunities for restoring vestibular function after hair cell damage...
November 15, 2016: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/27837042/gaze-shift-patterns-during-a-jump-with-full-turn-in-male-gymnasts
#4
Yusuke Sato, Shuko Torii, Masaharu Sasaki, Thomas Heinen
When airborne, gymnasts skillfully control their movements to achieve a successful landing. Utilizing visual information from task-specific eye-body coordination patterns (i.e., visual spotting) is thought to be important for gymnasts in the performance of aerial skills. The purpose of this study was to assess the interplay of eye movements and body movements in an aerial skill with a rotation about the longitudinal axis, namely a straight jump with full turn. Participants were 10 skilled male gymnasts (age [M ± SD], 23...
November 11, 2016: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/27802139/visual-resolution-and-contrast-sensitivity-in-two-benthic-sharks
#5
Laura A Ryan, Nathan S Hart, Shaun P Collin, Jan M Hemmi
Sharks have long been described as having 'poor' vision. They are cone monochromats and anatomical estimates suggest they have low spatial resolution. However, there are no direct behavioural measurements of spatial resolution or contrast sensitivity. This study estimates contrast sensitivity and spatial resolution of two species of benthic sharks, the Port Jackson shark, Heterodontus portusjacksoni, and the brown-banded bamboo shark, Chiloscyllium punctatum, by recording eye movements in response to optokinetic stimuli...
October 24, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27781300/functional-synergy-between-postural-and-visual-behaviors-when-performing-a-difficult-precise-visual-task-in-upright-stance
#6
Cédrick T Bonnet, Sébastien Szaffarczyk, Stéphane Baudry
Previous works usually report greater postural stability in precise visual tasks (e.g., gaze-shift tasks) than in stationary-gaze tasks. However, existing cognitive models do not fully support these results as they assume that performing an attention-demanding task while standing would alter postural stability because of the competition of attention between the tasks. Contrary to these cognitive models, attentional resources may increase to create a synergy between visual and postural brain processes to perform precise oculomotor behaviors...
October 26, 2016: Cognitive Science
https://www.readbyqxmd.com/read/27780044/evolution-of-biological-image-stabilization
#7
REVIEW
Ben J Hardcastle, Holger G Krapp
The use of vision to coordinate behavior requires an efficient control design that stabilizes the world on the retina or directs the gaze towards salient features in the surroundings. With a level gaze, visual processing tasks are simplified and behaviorally relevant features from the visual environment can be extracted. No matter how simple or sophisticated the eye design, mechanisms have evolved across phyla to stabilize gaze. In this review, we describe functional similarities in eyes and gaze stabilization reflexes, emphasizing their fundamental role in transforming sensory information into motor commands that support postural and locomotor control...
October 24, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/27695412/eye-movements-affect-postural-control-in-young-and-older-females
#8
Neil M Thomas, Theodoros M Bampouras, Tim Donovan, Susan Dewhurst
Visual information is used for postural stabilization in humans. However, little is known about how eye movements prevalent in everyday life interact with the postural control system in older individuals. Therefore, the present study assessed the effects of stationary gaze fixations, smooth pursuits, and saccadic eye movements, with combinations of absent, fixed and oscillating large-field visual backgrounds to generate different forms of retinal flow, on postural control in healthy young and older females...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27643747/cerebellar-control-of-eye-movements
#9
Shin C Beh, Teresa C Frohman, Elliot M Frohman
BACKGROUND: The cerebellum plays a central role in the online, real-time control, and long-term modulation of eye movements. EVIDENCE ACQUISITION: We reviewed the latest (fifth) edition of Leigh and Zee's textbook, The Neurology of Eye Movements, and literature in PUBMED using the following terms: cerebellum, flocculus, paraflocculus, vermis, oculomotor vermis, dorsal vermis, caudal fastigial nucleus, fastigial oculomotor region, uvula, nodulus, ansiform lobule, eye movements, saccades, ipsipulsion, contrapulsion, smooth pursuit, vergence, convergence, divergence, gaze-holding, down beat nystagmus, vestibulo-ocular reflex (VOR), angular VOR, translational VOR, skew deviation, velocity storage...
September 16, 2016: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/27559718/not-only-amblyopic-but-also-dominant-eye-in-subjects-with-strabismus-show-increased-saccadic-latency
#10
Maciej Perdziak, Dagmara K Witkowska, Wojciech Gryncewicz, Jan K Ober
Amblyopia is a developmental disorder of vision usually associated with the presence of strabismus and/or anisometropia during early childhood. Subject literature has shown that both the amblyopic and fellow eyes (especially in strabismic subjects) may manifest a variety of perceptual and oculomotor deficits. Previous studies using simple saccadic responses (pro-saccades) showed an increased saccadic latency only for the amblyopic eye viewing conditions. So far, there have appeared no saccadic latency studies in strabismic amblyopia for more complex volitional saccades...
August 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27552387/bilateral-vestibulopathy-aggravates-balance-and-gait-disturbances-in-sensory-ataxic-neuropathy-dysarthria-and-ophthalmoparesis-a-case-report
#11
Roeland B van Leeuwen, Bart W Smits, Richard J Rodenburg, Baziel G van Engelen
In patients with a triad of sensory ataxic neuropathy, dysarthria, and ophthalmoparesis (SANDO), the presenting features are mainly ataxia or ptosis. SANDO patients often have impaired balance and gait, which is not surprising considering the combination of sensory ataxic neuropathy, and additional symptoms like cerebellar ataxia and limb girdle weakness. We describe a SANDO patient who noticed an increasingly impaired balance and gait, without any dizziness. Neurological investigation revealed an external ophthalmeplegia and a cerebellar ataxia; the head impulse test was not reliable because of eye movement disorders...
September 2016: Journal of Clinical Neuromuscular Disease
https://www.readbyqxmd.com/read/27548896/perceptual-learning-in-children-with-infantile-nystagmus-effects-on-2d-oculomotor-behavior
#12
Bianca Huurneman, F Nienke Boonstra, Jeroen Goossens
PURPOSE: To determine changes in oculomotor behavior after 10 sessions of perceptual learning on a letter discrimination task in children with infantile nystagmus (IN). METHODS: Children with IN (18 children with idiopathic IN and 18 with oculocutaneous albinism accompanied by IN) aged 6 to 11 years were divided into two training groups matched on diagnosis: an uncrowded training group (n = 18) and a crowded training group (n = 18). Target letters always appeared briefly (500 ms) at an eccentric location, forcing subjects to quickly redirect their gaze...
August 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27540201/the-role-of-the-pharmacist-in-paediatric-palliative-care
#13
Jumana Khan, Sian Gaze, Stephen Tomlin
AIM: To explore what involvement pharmacists in the UK have in paediatric palliative care OBJECTIVES: 1. To determine the current roles and services provided by pharmacists to paediatric palliative care patients.2. To establish how other members of the multidisciplinary team perceive the pharmacist's role and the extent to which they value the pharmacist's contributions.3. To identify the references used by the multidisciplinary team to make clinical decisions about medication use in paediatric palliative care patients...
September 2016: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/27535612/the-frequency-of-small-saccades-during-fixation-is-age-independent-in-children-between-5-and-16%C3%A2-years-of-age
#14
Dorte Ancher Larsen, Toke Bek
PURPOSE: Fixational eye movements are necessary for maintaining normal vision by preventing a stabilized image on the retina that would result in visual fading. The movements can be divided into tremor, drifts and saccades that may be related to movements of gaze and to fixation. It has previously been shown that the frequency of fixational saccades with an amplitude larger than 3° depends on age. The purpose of this study was to investigate whether other parameters describing fixational saccades also depend on age which necessitates age correction in studies of fixation during visual development...
August 18, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27519610/impacts-of-small-vestibular-schwannoma-on-community-ambulation-postural-and-ocular-control
#15
Nancy L Low Choy, Mary-Therese M Lucey, Susan L Lewandowski, Benedict J Panizza
OBJECTIVES/HYPOTHESIS: To investigate balance, community mobility, gaze instability, and dizziness handicap and assess falls risk in people who are conservatively managed with small vestibular schwannoma (VS). STUDY DESIGN: Cross-sectional study with controls. METHODS: The study involved 18 people (mean age 58.7 ± 12.2 years) diagnosed with VS (<12 mm) and 22 age-matched controls (mean age 56.9 ± 8.0 years). Measures included standing on firm and foam surfaces with feet apart, then together with eyes open and closed, Timed Up and Go (TUG) test and dual TUG test, Dynamic Gait Index, 6-Minute Walk Test, Halmagyi Impulse Test, Dynamic Visual Acuity Test, and the Dizziness Handicap Inventory...
August 13, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27502243/postural-control-during-cascade-ball-juggling-effects-of-expertise-and-base-of-support
#16
Sérgio T Rodrigues, Paula F Polastri, Gisele C Gotardi, Stefane A Aguiar, Marcelo R Mesaros, Mayara B Pestana, Fabio A Barbieri
Cascade ball juggling is a complex perceptual motor skill which requires efficient postural stabilization. The aim of this study was to investigate effects of experience (expert and intermediate groups) and foot distance (wide and narrow stances) on body sway of jugglers during three ball cascade juggling. A total of 10 expert jugglers and 11 intermediate jugglers participated in this study. Participants stood barefoot on the force plate (some participants wore a gaze tracking system), with feet maintained in wide and narrow conditions and performed three 40-seconds trials of the three-ball juggling task...
August 2016: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/27486430/aging-increases-compensatory-saccade-amplitude-in-the-video-head-impulse-test
#17
Eric R Anson, Robin T Bigelow, John P Carey, Quan-Li Xue, Stephanie Studenski, Michael C Schubert, Konrad P Weber, Yuri Agrawal
OBJECTIVE: Rotational vestibular function declines with age resulting in saccades as a compensatory mechanism to improve impaired gaze stability. Small reductions in rotational vestibulo-ocular reflex (VOR) gain that would be considered clinically normal have been associated with compensatory saccades. We evaluated whether compensatory saccade characteristics varied as a function of age, independent of semicircular canal function as quantified by VOR gain. METHODS: Horizontal VOR gain was measured in 243 participants age 27-93 from the Baltimore Longitudinal Study of Aging using video head impulse testing...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27474118/diagnostic-stability-of-autism-spectrum-disorder-in-toddlers-prospectively-identified-in-a-community-based-setting-behavioural-characteristics-and-predictors-of-change-over-time
#18
Josephine Barbaro, Cheryl Dissanayake
Autism spectrum disorder diagnoses in toddlers have been established as accurate and stable across time in high-risk siblings and clinic-referred samples. Few studies have investigated diagnostic stability in children prospective identified in community-based settings. Furthermore, there is a dearth of evidence on the individual behaviours that predict diagnostic change over time. The stability and change of autism spectrum disorder diagnoses were investigated from 24 to 48 months in 77 children drawn from the Social Attention and Communication Study...
July 28, 2016: Autism: the International Journal of Research and Practice
https://www.readbyqxmd.com/read/27458558/operative-stabilization-of-the-remaining-mobile-segment-in-ankylosed-cervical-spine-in-systemic-onset-juvenile-idiopathic-arthritis-a-case-report
#19
Lovro Suhodolčan, Marko Mihelak, Janez Brecelj, Rok Vengust
We describe a case of a 19-year-old young man with oligoarthritis type of juvenile idiopathic arthritis, who presented with several month duration of lower neck pain and progressive muscular weakness of all four limbs. X-rays of the cervical spine demonstrated spontaneous apophyseal joint fusion from the occipital condyle to C6 and from C7 to Th2 with marked instability between C6 and C7. Surgical intervention began with anterolateral approach to the cervical spine performing decompression, insertion of cage and anterior vertebral plate and screws, followed by posterior approach and fixation...
July 18, 2016: World Journal of Orthopedics
https://www.readbyqxmd.com/read/27429945/ocular-motor-function-in-patients-with-bilateral-vestibular-weakness
#20
Seyyed Amir Hossein Ghazizadeh Hashemi, Sadegh Jafarzadeh, Majid Haddadi Aval, Reza Hosseinabadi
INTRODUCTION: Patients with bilateral weakness (BW) have many difficulties in gaze stability that interfere with their normal function. The aim of this study was to evaluate ocular motor functions in patients with BW to better understand the problem of gaze instability in these patients. MATERIALS AND METHODS: Patients were referred from the Otolaryngology Department for Vestibular Assessment to our clinic between November 2014 and March 2015. We assessed ocular motor function (gaze, saccade, and smooth pursuit) in patients over the age of 18 years with BW, as verified by a caloric test...
May 2016: Iranian Journal of Otorhinolaryngology
keyword
keyword
101535
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"