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

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.

Download Full-text

Dissociation between subjective vertical and subjective body orientation elicited by galvanic vestibular stimulation

Brain Research Bulletin ◽

10.1016/j.brainresbull.2004.11.012 ◽

2005 ◽

Vol 65 (1) ◽

pp. 77-86 ◽

Cited By ~ 18

Author(s):

Franck Mars ◽

Jean-Louis Vercher ◽

Konstantin Popov

Keyword(s):

Vestibular Stimulation ◽

Galvanic Vestibular Stimulation ◽

Body Orientation ◽

Subjective Vertical

Download Full-text

Effects of galvanic vestibular stimulation on subjective visual vertical and static eye deviation

Electroencephalography and Clinical Neurophysiology ◽

10.1016/s0013-4694(97)88208-2 ◽

1997 ◽

Vol 103 (1) ◽

pp. 67

Author(s):

R Zink

Keyword(s):

Vestibular Stimulation ◽

Galvanic Vestibular Stimulation ◽

Subjective Visual Vertical ◽

Visual Vertical

Download Full-text

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

Scientific Reports ◽

10.1038/s41598-021-83206-z ◽

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).

Download Full-text