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. 2019 Jan 4;9:1138. doi: 10.3389/fneur.2018.01138

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Copyright © 2019 Van Nechel, Bostan, Duquesne, Hautefort and Toupet.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Relation between the relative amplitude of covert saccades (A,C) and overt saccades (B,D) (ratio between the amplitude of the CUS and the head rotation amplitude) and the gaze position error in the bilateral vestibular deficient group for vHIT with visible target (A,B) and in darkness with an imaginary target (C,D). The gaze position error is the ratio between the remaining eye movement to reach the target (difference between the head rotation amplitude and the cumulative eye movement amplitude at the onset of the CUS) and the head rotation amplitude. There is a high correlation (straight line slope = 0.82, r = 0.79 p < 0.05) between the amplitude of the overt saccades and the gaze position error with visible target. The correlation coefficient of the amplitude of overt saccades in darkness is 0.55 (D).