Head Position versus Head Motion in the Inhibition of Horizontal Postrotary Nystagmus
Head Position versus Head Motion in the Inhibition of Horizontal Postrotary Nystagmus
A tilt from the prior erect position to a horizontal head position stimulates not only the otoliths but also the vertical semicircular canals and neck afferents. To clarify further the inputs needed for inhibition, the authors compared static head tilts having only one dynamic component with head movements giving predominantly dynamic components. In addition, intermittent head tilts of different durations and at different times after the stop were used to study the dynamics of the “dumping” process. Head tilts after the presumed end of the peripheral input were used to study whether the effect of the inhibitory stimulus changes in the absence of peripheral input from the horizontal semicircular canals.
Keywords: tilt, erect position, semicircular canals, neck afferents, head tilts, peripheral input
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