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. 2021 Nov 19;12:759764. doi: 10.3389/fneur.2021.759764

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Copyright © 2021 Sugawara, Wada, Ito and Sakai.

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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Records of subjective visual vertical (SVV) and ocular counter-rolling (OCR) tests from a MS susceptible individual. (A) Slope of lines depict left (based on rectangle-dots) and right (based on triangle-dots) head-tilt subjective visual vertical (HT-SVV) gain (S_l and S_r, respectively). Circle dots are used to calculate head-upright SVV. (B) Eye torsion (blue thin line) and head tilt (gray bold line) angle during the OCR test. Short horizontal bars depict 5 s time periods used for calculating OCR gains.