The Vestibular Evoked Myogenic Potential (VEMP) is a short latency EMG (eletromyographic) response evoked at high level acoustic stimulation and recorded from surface electrodes over the contracted sternocleidomastoid (SCM) muscle.
Electronystagmography and rotational tests only assess the horizontal semicircular canals of the vestibular system.
The VEMP assesses the saccule and inferior vestibular nerve which other tests do not assess.
By using the Bio-logic EMG Rectifying, if a VEMP amplitude is reduced on one side compared to the other, you are assured that the response reduction is due to a vestibular abnormality and not due to a lack of tonic SCM muscle contraction caused by improper patient position or fatigue.
