Potentials generated in the auditory nerve and in different regions of the auditory pathways in the brain stem can be recorded at the vertex of the head after auditory stimulation.1»! These brain stem auditory evoked potentials (BAEPs) occur within 10 msec of the stimulus, which for clinical purposes is a monaural click. This is usually set at approximately 65 dB above the patient's hearing threshold and is delivered through earphones while the opposite ear is masked by white (i.e., mixed-frequency) noise. The attention of the subject is not required. Because the BAEP is of very low voltage, between 1000 and 2000 responses are generally recorded so that the BAEP can be extracted by averaging from the background noise.
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