Abstract
The effects of unilateral galvanic vestibular stimulation on (1) ocular torsion, (2) subjective tilt of the peripheral visual field, and (3) subjective tilt of a foveal vertical line were measured in 12 healthy subjects. A rectangular, unipolar binaural electric current was applied to the subject's mastoid. Anodal stimulation of the right mastoid led to an ipsiversive tonic ocular torsion (0.5–3.7°) and to a contralateral tilt of both the peripheral visual field (1–9°), and a foveal vertical line (0.5–6.2°). There was a correlation between the amount of the three measured parameters and the strength of the applied current. Static ocular torsion, central and peripheral visual tilts represent stimulus-induced tonic otolith imbalance between the two labyrinths. Thus, galvanic vestibular stimulation not only affects dynamic semicircular canal input but also static otolith input in the roll plane.
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