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- W1975856775 abstract "Cathodal galvanic currents activate primary vestibular afferents, whereas anodal currents inhibit them. Pulsed galvanic vestibular stimulation (GVS) was used to determine the latency and initiation of the human vestibuloocular reflex. Three-dimensional galvanic vestibuloocular reflex (g-VOR) was recorded with binocular dual-search coils in response to a bilateral bipolar 100-ms rectangular pulse of current at 0.9 (near-threshold), 2.5, 5.0, 7.5, and 10.0 mA in 11 normal subjects. The g-VOR consisted of three components: conjugate torsional eye rotation away from cathode toward anode; vertical divergence (skew deviation) with hypertropia of the eye on the cathodal and hypotropia of the eye on the anodal sides; and conjugate horizontal eye rotation away from cathode toward anode. The g-VOR was repeatable across all subjects, its magnitude a linear function of the current intensity, its latency about 9.0 ms with GVS of ≥2.5 mA, and was not suppressed by visual fixation. At 10-mA stimulation, the g-VOR [ x, y, z] on the cathodal side was [0.77 ± 0.10, −0.05 ± 0.05, −0.18 ± 0.06°] (mean ± 95% confidence intervals) and on the anodal side was [0.79 ± 0.10, 0.16 ± 0.05, −0.19 ± 0.06°], with a vertical divergence of 0.20°. Although the horizontal g-VOR could have arisen from activation of the horizontal semicircular canal afferents, the vertical-torsional g-VOR resembled the vestibuloocular reflex in response to roll-plane head rotation about an Earth-horizontal axis and might be a result of both vertical semicircular canal and otolith afferent activations. Pulsed GVS is a promising technique to investigate latency and initiation of the human vestibuloocular reflex because it does not require a large mechanical apparatus nor does it pose problems of head inertia or slippage." @default.
- W1975856775 created "2016-06-24" @default.
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- W1975856775 date "2006-08-01" @default.
- W1975856775 modified "2023-10-17" @default.
- W1975856775 title "Latency and Initiation of the Human Vestibuloocular Reflex to Pulsed Galvanic Stimulation" @default.
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- W1975856775 doi "https://doi.org/10.1152/jn.01250.2005" @default.
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