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Skew deviation of the eyes in normal human subjects induced by semicircular canal stimulation

1996; Elsevier BV; Volume: 205; Issue: 2 Linguagem: Inglês

10.1016/0304-3940(96)12372-7

1872-7972

Kathrine Jáuregui‐Renaud, Mary Faldon, Andrew H. Clarke, A.M. Bronstein, Michael A. Gresty,

Musculoskeletal pain and rehabilitation

Computerised video-oculography and scleral search coils were used to record the horizontal, vertical and torsional binocular eye movements of human subjects exposed to roll oscillation at 0.4 Hz about earth-horizontal and earth-ventrical naso-occipital axes in darkness. The stimuli provoked a dominant torsional ('ocular counter-rolling') response with a ratio of peak slow phase eye velocity to stimulus velocity which was not significantly different for earth-horizontal (0.39, SD 0.08) or earth-vertical axis orientations (0.40, SD 0.08). For all conditions the responses also had a head-vertical component which was disconjugate ('skew deviation'). The cumulative, vertical, slow phase divergence was 5.8°, SD 1.3°, about upright and 4.3°, SD 0.6°, when supine. This is the first demonstration that dynamic roll stimuli provoke a skew deviation in normal human subjects. At the frequency tested, the skew was driven by vertical semicircular canal stimulation.