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Abstract
Visuo-vestibular interaction during randomized and sinusoidal head oscillations (0.5–5.0 Hz) was measured by power spectral analysis. It was shown that visual eye movement programmes can adjust the vestibulo-ocu-lar reflex (VOR) gain at frequencies exceeding the dynamic range of visual tracking: above 3 Hz, gains exceeded unity during attempted fixation of a target moving with the subject whereas unity gains prevailed during fixation of an earth-fixed target. At low frequencies, fixation suppression was more efficient (-10 dB) when sinusoidal stimuli rather than randomized oscillations (-3 dB) were employed. Identical results were obtained when the fixation target moved with a total visual surround or against an earth-fixed visual background. Therefore, peripheral vision is normally not important for visual suppression of the VOR, which is dominated by toveal visual tracking at low frequencies.