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Head impulse test (HIT). (A) In healthy subjects, HIT (arrow) normally induces a rapid compensatory eye movement in the opposite direction, and steady fixation is attained. (B) In patients with unilateral peripheral vestibular hypofunction, HIT toward the affected side (large arrow) produces a corrective saccade (small arrows) after head rotation because the eyes move with the head due to a defective vestibulo-ocular reflex, thus losing the target with head rotation.
