**5.7 Head impulse test (HIT)**

The HIT is a bedside technique used to diagnose reduction in vestibular function in one vestibular system versus the other. It allows the evaluation of VOR function in high head velocities (delivered by a clinician) in the direction of each pair of semicircular canals (**Figure 7**). During the head movement, the subject is asked to keep the eyes in a target or fixed object. The test can detect semicircular canal paresis or abnormal eye movements (as "catch up" saccade), which indicate peripheral vestibular disorder [31].
