Effects of Galvanic Vestibular Stimulation on Perception of Subjective Vertical in Standing Humans

1998 ◽  
Vol 86 (3_suppl) ◽  
pp. 1155-1161 ◽  
Author(s):  
Marie-Françoise Tardy-Gervet ◽  
Alexandra Séverac-Cauquil
Keyword(s):  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Cathode Side ◽  
Anode Side ◽  
Ocular Torsion ◽  
Apparent Displacement ◽  
Experimental Conditions ◽  
Subjective Vertical ◽  
Central Representation ◽  
Standing Humans

The present work reinvestigated the influence of bimastoidal galvanic vestibular stimulation (0.4 mA during 10 sec.) on subjective vertical. We tested the hypothesis that deviations are directed towards the anode side, like postural tilt evoked by galvanic vestibular stimulation. 15 subjects were instructed to orient vertically in darkness a light-rod during 3 experimental conditions of control, anode right, and anode left. The statistical analysis showed that the perception of the vertical was modified according to the experimental conditions and the subjects. Angular deviations occurred towards the anode side. The results are interpreted as a consequence of a modification of the central representation of the vertical or of ocular torsion directed towards the anode side and likely to induce an apparent displacement of the rod towards the cathode side.

Central processing of human ocular torsion analyzed by galvanic vestibular stimulation

Neuroreport ◽  
2000 ◽  
Vol 11 (7) ◽  
pp. 1559-1563 ◽  
Author(s):  
Erich Schneider ◽  
Stefan Glasauer ◽  
Marianne Dieterich
Keyword(s):  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Ocular Torsion ◽  
Central Processing

Comparison of Human Ocular Torsion Patterns During Natural and Galvanic Vestibular Stimulation

2002 ◽  
Vol 87 (4) ◽  
pp. 2064-2073 ◽  
Author(s):  
Erich Schneider ◽  
Stefan Glasauer ◽  
Marianne Dieterich
Keyword(s):  
Eye Movements ◽  
Healthy Subjects ◽  
Vestibular Stimulation ◽  
Stimulus Onset ◽  
Galvanic Vestibular Stimulation ◽  
Ocular Torsion ◽  
Tonic Component ◽  
Axis Parallel ◽  
Head Rotations ◽  
Torsional Nystagmus

Galvanic vestibular stimulation (GVS) is reported to induce interindividually variable tonic ocular torsion (OT) and superimposed torsional nystagmus. It has been proposed that the tonic component results from the activation of otolith afferents. We tested our hypothesis that both the tonic and the phasic OT are mainly due to semicircular canal (SCC) stimulation by examining whether the OT patterns elicited by GVS can be reproduced by pure SCC stimulations. Using videooculography we measured the OT of six healthy subjects while two different stimuli with a duration of 20 s were applied: 1) transmastoidal GVS steps of 2 mA with the head in a pitched nose-down position and 2) angular head rotations around a combined roll-yaw axis parallel to the gravity vector with the head in the same position. The stimulation profile was individually scaled to match the nystagmus properties from GVS and consisted of a sustained velocity step of 4–12°/s on which a velocity ramp of 0.67–2°/s2 was superimposed. Since blinks were reported to induce transient torsional eye movements, the subjects were also asked to blink once 10 s after stimulus onset. Analysis of torsional eye movements under both conditions revealed no significant differences. Thus we conclude that both the tonic and the phasic OT responses to GVS can be reproduced by pure rotational stimulations and that the OT-related effects of GVS on SCC afferents are similar to natural stimulations at small amplitudes.

Galvanic Vestibular Stimulation Modifies Vection Paths in Healthy Subjects

2006 ◽  
Vol 95 (5) ◽  
pp. 3199-3207 ◽  
Author(s):  
Jean-Claude Lepecq ◽  
Catherine De Waele ◽  
Sophie Mertz-Josse ◽  
Claudine Teyssèdre ◽  
Patrice Tran Ba Huy ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Cathode Side ◽  
Motion Path ◽  
Optokinetic Stimulation ◽  
Vestibular Information ◽  
Linear Vection ◽  
Self Motion ◽  
First Time

The present study aimed at determining whether vestibular inputs contribute to the perception of the direction of self-motion. This question was approached by investigating the effects of binaural bipolar galvanic vestibular stimulation (GVS) on visually induced self-motion (i.e., vection) in healthy subjects. Stationary seated subjects were submitted to optokinetic stimulation inducing either forward or upward linear vection. While perceiving vection, they were administered trapezoidal GVS of different intensities and ramp durations. Subjects indicated the shape and direction of their perceived self-motion path throughout the experiment by a joystick, and after each trial by the manipulation of a 3D mannequin. Results show that: 1) GVS induced alterations of the path of vection; 2) these alterations occurred more often after GVS onset than after GVS offset; 3) the occurrence of vection path alterations after GVS onset depended on the intensity of GVS but not on the steepness of the GVS variation; 4) the vection path deviated laterally according to either an oblique or a curved path; and 5) the vection path deviated toward the cathode side after GVS onset. It is the first time that vestibular information, already known to contribute to the induction of vection, is shown to modify self-motion perception during the course of vection.

Supramodal effects of galvanic vestibular stimulation on the subjective vertical

Neuroreport ◽  
2001 ◽  
Vol 12 (13) ◽  
pp. 2991-2994 ◽  
Author(s):  
Franck Mars ◽  
Konstantin Popov ◽  
Jean-Louis Vercher
Keyword(s):  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Subjective Vertical

Subliminal galvanic-vestibular stimulation recalibrates the distorted visual and tactile subjective vertical in right-sided stroke

2015 ◽  
Vol 74 ◽  
pp. 178-183 ◽  
Author(s):  
Karin Oppenländer ◽  
Kathrin S. Utz ◽  
Stefan Reinhart ◽  
Ingo Keller ◽  
Georg Kerkhoff ◽  
...  
Keyword(s):  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Subjective Vertical

scholarly journals Effects of galvanic vestibular stimulation on postural limb reflexes and neurons of spinal postural network

2012 ◽  
Vol 108 (1) ◽  
pp. 300-313 ◽  
Author(s):  
L.-J. Hsu ◽  
P. V. Zelenin ◽  
G. N. Orlovsky ◽  
T. G. Deliagina
Keyword(s):  
Vestibular Stimulation ◽  
Afferent Input ◽  
Galvanic Vestibular Stimulation ◽  
Dorsal Side ◽  
Body Orientation ◽  
Cathode Side ◽  
Body Sway ◽  
Postural Control System ◽  
Opposite Pattern ◽  
Neuronal Mechanisms

Quadrupeds maintain the dorsal side up body orientation due to the activity of the postural control system driven by limb mechanoreceptors. Binaural galvanic vestibular stimulation (GVS) causes a lateral body sway toward the anode. Previously, we have shown that this new position is actively stabilized, suggesting that GVS changes a set point in the reflex mechanisms controlling body posture. The aim of the present study was to reveal the underlying neuronal mechanisms. Experiments were performed on decerebrate rabbits. The vertebral column was rigidly fixed, whereas hindlimbs were positioned on a platform. Periodic lateral tilts of the platform caused postural limb reflexes (PLRs): activation of extensors in the loaded and flexing limb and a decrease in extensor activity in the opposite (unloaded and extending) limb. Putative spinal interneurons were recorded in segments L4–L5 during PLRs, with and without GVS. We have found that GVS enhanced PLRs on the cathode side and reduced them on the anode side. This asymmetry in PLRs can account for changes in the stabilized body orientation observed in normal rabbits subjected to continuous GVS. Responses to platform tilts (frequency modulation) were observed in 106 spinal neurons, suggesting that they can contribute to PLR generation. Two neuron groups were active in opposite phases of the tilt cycle of the ipsi-limb: F-neurons in the flexion phase, and E-neurons in the extension phase. Neurons were driven mainly by afferent input from the ipsi-limb. If one supposes that F- and E-neurons contribute, respectively, to excitation and inhibition of extensor motoneurons, one can expect that the pattern of response to GVS in F-neurons will be similar to that in extensor muscles, whereas E-neurons will have an opposite pattern. We have found that ∼40% of all modulated neurons meet this condition, suggesting that they contribute to the generation of PLRs and to the GVS-caused changes in PLRs.

scholarly journals Effect of noisy galvanic vestibular stimulation on dynamic posture sway under visual deprivation in patients with bilateral vestibular hypofunction

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Po-Yin Chen ◽  
Ying-Chun Jheng ◽  
Chien-Chih Wang ◽  
Shih-En Huang ◽  
Ting-Hua Yang ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Light Exposure ◽  
Light Condition ◽  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Lateral Deviation ◽  
Clinical Trial Registration ◽  
Vestibular Hypofunction ◽  
Dark Conditions ◽  
Bilateral Vestibular Hypofunction

AbstractA single-blind study to investigate the effects of noisy galvanic vestibular stimulation (nGVS) in straight walking and 2 Hz head yaw walking for healthy and bilateral vestibular hypofunction (BVH) participants in light and dark conditions. The optimal stimulation intensity for each participant was determined by calculating standing stability on a force plate while randomly applying six graded nGVS intensities (0–1000 µA). The chest–pelvic (C/P) ratio and lateral deviation of the center of mass (COM) were measured by motion capture during straight and 2 Hz head yaw walking in light and dark conditions. Participants were blinded to nGVS served randomly and imperceivably. Ten BVH patients and 16 healthy participants completed all trials. In the light condition, the COM lateral deviation significantly decreased only in straight walking (p = 0.037) with nGVS for the BVH. In the dark condition, both healthy (p = 0.026) and BVH (p = 0.017) exhibited decreased lateral deviation during nGVS. The C/P ratio decreased significantly in BVH for 2 Hz head yaw walking with nGVS (p = 0.005) in light conditions. This study demonstrated that nGVS effectively reduced walking deviations, especially in visual deprived condition for the BVH. Applying nGVS with different head rotation frequencies and light exposure levels may accelerate the rehabilitation process for patients with BVH.Clinical Trial Registration This clinical trial was prospectively registered at www.clinicaltrials.gov with the Unique identifier: NCT03554941. Date of registration: (13/06/2018).

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