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We encountered patients who had static direction-changing positional nystagmus (DCPN) canceled at about 20–30° yaw head rotation from the supine position. This nystagmus was also canceled when the head was rotated 180° from this position. We termed these head positions neutral points. The positional nystagmus observed (except at the neutral points) was thought to occur due to a “heavy cupula” or “light...
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