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. 2017 Oct 25;8:552. doi: 10.3389/fneur.2017.00552

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Copyright © 2017 Kheradmand and Winnick.

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) or licensor 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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Schematic representation of the periodic subjective visual vertical (SVV) modulation by the frame orientation (solid line) during head tilt: frame tilt orientations close to the subject’s upright perception (dashed line) usually result in an “attractor bias” (i.e., toward the direction of the frame tilt), while there is a “detractor bias” at angles beyond 45° and up to 90° (i.e., away from the direction of the frame tilt). These biases caused by the frame orientation can either attenuate or accentuate SVV errors, depending on head tilt position (e.g., here 20° head tilt to the left).