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Nystagmus traces in the horizontal and vertical planes in a 29-year-old normal control. In the upright and supine position there is spontaneous up-beating nystagmus, with right-beating nystagmus visible in either lateral position. [H; Horizontal (plane), RBN; Right-beating nystagmus, UBN; Up-beating nystagmus, V; Vertical (plane), °; Degrees, °/s; Degrees per second. Grey bars indicate blinking artefact.].
