Influence of voluntary ocular deviation on vestibular nystagmus.
We examined the influence of voluntary gaze deviation on per-rotary vestibular nystagmus during trapezoidal velocity profiles. Gaze deviation in the direction of the fast-phase component of nystagmus significantly increased slow-phase amplitude, fast-phase amplitude and slow-phase velocity; gaze deviation in the direction of the slow phase marginally decreased these three properties. Schlagfeld deviation and beat frequency were unaffected by per-rotary ocular deviation in either direction. The observed changes in per-rotary eye movements are consistent with post-rotary observations first described by Alexander which later became known as "Alexander's Law".
D000328:Adult; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008297:Male; D009760:Nystagmus, Physiologic; D012399:Rotation; D014722:Vestibule, Labyrinth / Q000502:physiology