Brainstem auditory evoked response (BAER) Home A-Z Health Information Health Library A-Z Brainstem Auditory Evoked Response (BAER) Overview The brainstem auditory evoked response is a non-invasive test used to assess the function of auditory nerve and brainstem. It measures the electrical activity generated in response to an auditory stimulus. Method Electrodes are placed on the scalp and earsPatient listens to sounds generated in the form of clicks and tonesThe brain activity generated in response to the sound is recorded Indications New-born screening for hearing disordersDiagnosing auditory nerve damageMonitoring brain stem function in comatose patientsDiagnosing hearing loss or deafnessDiagnostic tools in acoustic neuroma or multiple sclerosis