The videonystagmogram (VNG) tracing above displays a 'left-beating' nystagmus and reveals another characteristic of a peripheral (from the inner ear to the brainstem) vestibular nerve disfunction, that of 'fixation suppression'. This means that the amount of nystagmus is reduced when the patient fixates on something, in this case, a light inside the goggles that are worn. The VNG tracing below displays 'left-beating' nystagmus, which is continuous throughout the entire recording time.
Below is a Rotary Chair tracing revealing typical findings of an acute unilateral vestibular loss, including reduced VOR gain, VOR asymmetry and phase lead. Once central compensation occurs, the VOR gain may improve and the VOR asymmetry resolved, but the phase lead often remains.