Supplemental Digital Content 3-1
Video demonstrates a head-impulse test with scaled peak head velocities of 100°/s (A), 200°/s (B), and 300°/s (C) in a patient with left vestibular loss. Note the increasing salience of the catch-up saccades with stimulus size. The picture-in picture shows the online feedback trace (500 milliseconds) of angular head velocity (°/s) for the examiner. Head velocity was measured with a search coil mounted on a dental impression plate.
links.lww.com/CONT/A1
Reproduced with permission from Weber KP, Aw ST, Todd MJ, et al. Head impulse tests in unilateral vestibular loss: vestibulo-ocular reflex and catch-saccades. Neurology 2008;70(6):454Y463. B 2008, American Academy of Neurology.