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. 2017 Nov 14;8:600. doi: 10.3389/fneur.2017.00600

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Copyright © 2017 Guinand, Van de Berg, Cavuscens, Ranieri, Schneider, Lucieer, Kingma, Guyot and Pérez Fornos.

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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Sample video head impulse test responses of the three tested patients around one of the tested planes. For each patient [S1 right anterior–left posterior (RALP), upper lines; S2 horizontal, middle lines; S3 RALP, lower lines], the panels in the first column show data gathered without stimulation [system OFF condition (A)]. The panels in the second column show data gathered upon stimulation using a linear transfer function with a positive slope [system ON positive slope (B); S1: 4 µA/°/s, S2: 3 µA/°/s, S3: 2 µA/°/s]. Panels in the third column show data gathered upon stimulation using a linear transfer function with a negative slope [system ON negative slope (C); S1: −2 μA/°/s, S2: −0.5 μA/°/s, S3: −2 μA/°/s]. Solid black lines represent the cycle plots of the angular velocity of the head around the tested plane. Solid red and blue lines represent the cycle plots of the angular velocity of the eye in the plane of the tested canal for excitatory (red) and inhibitory impulses (blue). Positive values correspond to motion directed leftward in the horizontal plane, and motion directed downward in the vertical plane.

Sample video head impulse test responses of the three tested patients around one of the tested planes. For each patient [S1 right anterior–left posterior (RALP), upper lines; S2 horizontal, middle lines; S3 RALP, lower lines], the panels in the first column show data gathered without stimulation [system OFF condition (A)]. The panels in the second column show data gathered upon stimulation using a linear transfer function with a positive slope [system ON positive slope (B); S1: 4 µA/°/s, S2: 3 µA/°/s, S3: 2 µA/°/s]. Panels in the third column show data gathered upon stimulation using a linear transfer function with a negative slope [system ON negative slope (C); S1: −2 μA/°/s, S2: −0.5 μA/°/s, S3: −2 μA/°/s]. Solid black lines represent the cycle plots of the angular velocity of the head around the tested plane. Solid red and blue lines represent the cycle plots of the angular velocity of the eye in the plane of the tested canal for excitatory (red) and inhibitory impulses (blue). Positive values correspond to motion directed leftward in the horizontal plane, and motion directed downward in the vertical plane.