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February 1982

Intracranially Recorded Auditory Nerve Response in Man: New Interpretations of BSER

Author Affiliations

From the Divisions of Physiological Acoustics (Dr A. Møller) and Audiology (Dr M. Møller), Department of Otolaryngology, Eye and Ear Hospital, and the Department of Neurological Surgery, Presbyterian University Hospital (Dr Jannetta), University of Pittsburgh School of Medicine.

Arch Otolaryngol. 1982;108(2):77-82. doi:10.1001/archotol.1982.00790500013003

• Compound action potentials were recorded from the intracranial part of the human auditory nerve when it was exposed during surgery with the use of a posterior fossa approach. Monopolar recordings of the response to tone bursts were dominated by a negative deflection that reached a peak 3 to 3.5 ms after the onset of a 5-ms 2-kHz tone burst. This negative peak matched the latency of the second vertex-negative peak of the scalprecorded brainstem evoked responses (BSERs). Bipolar recordings from the intracranial part of the auditory nerve showed the biphasic waveshape that is typical for a nerve trunk. The results indicate that the neural generators not only of the first peak but also of the second peak in the BSER are likely to be located in the auditory nerve. Furthermore, the results indicate that it is the third wave that originates in the cochlear nucleus, not the second wave as was previously assumed.

(Arch Otolaryngol 1982;108:77-82)