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We thank Dr. Chen for the comment on our article,1 and for highlighting the video head impulse test (vHIT), which refers to a system for testing the vestibulo-ocular reflex of each semicircular canal at high frequency.2–5 There are several vHIT systems; most consist of a high-speed video camera with velocity sensors mounted on a lightweight spectacle frame worn by the patient, and computer software generates quantitative feedback. A video demonstration of a vHIT system, designed by MacDougall et al., is available at Neurology.org.2
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Author disclosures are available upon request (journal{at}neurology.org).
- Copyright © 2018 American Academy of Neurology
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