Auditory brainstem response

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The auditory brainstem response (ABR), also called brainstem evoked response audiometry (BERA) or brainstem auditory evoked potentials (BAEPs) or brainstem auditory evoked responses (BAERs) is an auditory evoked potential extracted from ongoing electrical activity in the brain and recorded via electrodes placed on the scalp. The recording is a series of six to seven vertex positive waves of which I through V are evaluated. These waves, labeled with Roman numerals in Jewett/Williston convention, occur in the first 10 milliseconds after onset of an auditory stimulus. The ABR is termed an exogenous response because it is dependent upon external factors. The auditory structures that generate the auditory brainstem response are believed to be as follows: Wave I through III – generated by the auditory branch of cranial nerve VIII and lower Wave IV and V – generated by the upper brainstem Waves I and II originate from the distal and proximal auditory nerve fibers, wave III from the cochlear nucleus, IV showing activity in the superior olivary complex, and wave V with the lateral lemniscus.