Video Head Impulse Test in Darkness, Without Visual Fixation: A Study on Healthy Subjects
This study aimed to evaluate the possibility of individualizing the VOR contribution to the HIT.
Design:
Thirty-six healthy individuals (19 males, 17 females; age 21–64 years, mean 39 years) underwent horizontal video HIT (vHIT). This was first conducted in darkness, without visual fixation, and then visually tracked.
Results:
Seventy percent of the impulses delivered ocular responses opposite to the direction of the head, matching its velocity to a point where quick anticompensatory eye movements (SQEM) stopped the response (SQEM mean latency 58.21 ms, interquartile range 50–67 ms). Of these, 75% recaptured the head velocity after culmination. Thirty percent of the responses completed a bell-shaped curve. The completed bell-shaped curve gains and instantaneous gains (at 40, 60, and 80 ms) before SQEM were equivalent for both paradigms. Females completed more bell-shaped traces (42%) than males (15%); p = 0.01. The SQEM latency was longer (62.81 versus 55.71 ms, p
Source: Ear and Hearing - Category: Audiology Tags: Research Article Source Type: research