Investigation of the Mastoid Electrode Contribution to the Brain Stem Auditory Evoked Response

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Abstract
The auditory nerve and brain stem responses recorded at the vertex and mastoids were closely examined in normal subjects using a larynx electrode as a neutral reference point. With monaural stimulation, significant activity was found at the vertex and both mastoids. The waveforms at the ipsi- and contralateral mastoids were consistently different. With binaural stimulation the small amplitude mastoid responses were largely in phase with the vertex response. The implications for correct diagnosis of brain stem pathologies are discussed.