Fig. 1

Eye velocities by EOG (abscissa) and VOG (ordinate). N = 840. If the correlation were perfect all the values would fall on the diagonal line. Many data points lie on top or nearly on top of each other. Velocities for VOG recording were higher than for the same beats of nystagmus recorded with EOG. The group of data points on the lower right of the figure suggests that large EOG velocities deviate much more from VOG than lower velocities. Spearman’s rho =0.529