BERA

The auditory brainstem response (ABR) is an auditory evoked potential extracted from ongoing electrical activity in the brain and recorded via electrodes placed on the scalp. The resulting recording is a series of vertex positive waves of which I through V are evaluated. These waves, labeled with roman numerals in Jewett and Williston convention, occur in the first 10 milliseconds after onset of an auditory stimulus. The ABR is considered 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 – generated by the peripheral portion of cranial nerve VIII
  • Wave II – generated by the central portion of cranial nerve VIII
  • Wave III – generated by the cochlear nucleus
  • Wave IV – generated by the superior olivary complex/lateral lemniscus
  • Wave V – generated by the lateral lemniscus/inferior colliculus

 



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