The effect of vestibulo-ocular reflex deficits and covert saccades on dynamic vision in opioid-induced vestibular dysfunction. [PDF]
PLoS ONE, 2014 Patients with bilateral vestibular dysfunction cannot fully compensate passive head rotations with eye movements, and experience disturbing oscillopsia.
Cecilia Ramaioli +6 more
doaj +12 more sources
New insights into vestibular-saccade interaction based on covert corrective saccades in patients with unilateral vestibular deficits [PDF]
Journal of Neurophysiology, 2017 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 ...
COLAGIORGIO, PAOLO +8 more
exaly +9 more sources
Covert Visual Spatial Orienting and Saccades: Overlapping Neural Systems [PDF]
NeuroImage, 2000 We used functional magnetic resonance imaging (fMRI) to investigate the functional anatomical relationship between covert orienting of visual spatial attention and execution of saccadic eye movements. Brain areas engaged by shifting spatial attention covertly and by moving the eyes repetitively toward visual targets were compared and contrasted ...
Nobre, A +3 more
exaly +5 more sources
Are Covert Saccade Functionally Relevant in Vestibular Hypofunction? [PDF]
The Cerebellum, 2017 The vestibulo-ocular reflex maintains gaze stabilization during angular or linear head accelerations, allowing adequate dynamic visual acuity. In case of bilateral vestibular hypofunction, patients use saccades to compensate for the reduced vestibulo-ocular reflex function, with covert saccades occurring even during the head displacement. In this study,
Hermann, Ruben +5 more
openaire +6 more sources
Covert oculo-manual coupling induced by visually guided saccades. [PDF]
Frontiers in Human Neuroscience, 2013 Hand pointing to objects under visual guidance is one of the most common motor behaviors in everyday life. In natural conditions, gaze and arm movements are commonly aimed at the same target and the accuracy of both systems is considerably enhanced if ...
Luca eFalciati +2 more
doaj +3 more sources
The Role of Neck Input in Producing Corrective Saccades in the Head Impulse Test
Frontiers in Neurology, 2022 BackgroundThe head impulse test is a valuable clinical test that can help identify peripheral vestibular dysfunction by observing corrective saccades that return the eyes to the target of interest.
Shinichi Iwasaki +5 more
doaj +3 more sources
Video Head Impulse Test (vHIT): Value of Gain and Refixation Saccades in Unilateral Vestibular Neuritis [PDF]
Journal of Clinical Medicine, 2022 The aim of this study was to evaluate gain and refixation saccades (covert and overt) using a video head impulse test (vHIT) in the horizontal and vertical planes in patients after the onset of unilateral acute vestibular neuritis (AVN).
Athanasia Printza +2 more
exaly +2 more sources
Enhanced Eye Velocity With Backup Saccades in vHIT Tests of a Menière Disease Patient: A Case Report
Frontiers in Surgery, 2021 Reduced eye velocity and overt or covert compensatory saccades during horizontal head impulse testing are the signs of reduced vestibular function. However, here we report the unusual case of a patient who had enhanced eye velocity during horizontal head
Maria Montserrat Soriano-Reixach +6 more
doaj +3 more sources
Short-Latency Covert Saccades - The Explanation for Good Dynamic Visual Performance After Unilateral Vestibular Loss? [PDF]
Frontiers in Neurology, 2021 Background: Functional head impulse test (fHIT) tests the ability of the vestibulo-ocular reflex (VOR) to allow visual perception during head movements. Our previous study showed that active head movements to the side with a vestibular lesion generated a
Julia Sjögren +5 more
doaj +3 more sources
Covert preparation of a manual response in a ‘go’/’no-go’ saccadic task is driven by execution of the eye movement and not by visual stimulus occurrence. [PDF]
Frontiers in Human Neuroscience, 2015 It has been recently demonstrated that visually guided saccades are linked to changes in muscle excitability in the relaxed upper limb, which are compatible with a covert motor plan encoding a hand movement toward the gaze target.
Claudio eMaioli, Luca eFalciati
doaj +4 more sources