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. 2023 Apr 11;14:1147253. doi: 10.3389/fneur.2023.1147253

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Copyright © 2023 Curthoys, McGarvie, MacDougall, Burgess, Halmagyi, Rey-Martinez and Dlugaiczyk.

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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Goggles 3-D head sensor outputs for test jig leftwards earth-horizontal impulses. (A) Stimulus axis and head axis aligned (upright, forwards and backwards); (B) head tilted 25° backward, jig impulse earth horizontal; (C) head tilted 25° forwards, jig impulse earth horizontal. Note that when the head is tilted forward or backwards, and the stimuli are delivered in the earth horizontal plane, the horizontal head velocity sensor underestimates the true horizontal head rotation velocity by the cosine of the misalignment angle. In this case it will be underestimated by about 10% (cos 25° = 0.906).