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Abstract
Gaze functions under high-frequency head oscillations with large amplitudes were investigated in 12 normal subjects. Oscillation amplitude decreased as the frequency increased (31° at 2 Hz to 11° at 5 Hz on average). Maximum head velocity and acceleration were 170-200°/s and 2500-5000°/s2, respectively. At frequencies higher than 2 Hz, the mean ratio of eye amplitude to head amplitude reached high large values (1.2 at 2 Hz to 1.8 at 5 Hz, on average), whereas it dropped to extremely low values (0.5–0.6 at 3–5 Hz) in the 2 referred patients with bilateral labyrinthine loss. High ratio values, different from the previous reports, may result from a failure of compensation due to abnormally high-frequency and large head oscillations. The present study indicated that the frequency range of VOR influenced by gaze should correspond to that of daily-experienced oscillations, and that once head oscillations exceed the limit, compensation quickly deteriorates.