An improved technique for simultaneous recording of action potential and auditory brainstem responses

A simple method for the assessment of central conduction time in auditory brainstem response (ABR) cases with distorted or absent wave I and the technical problems involved are discussed. New electrodes systems for extra/transtympanic recording, artifact-free acoustic stimulation and a combined recording of the large amplitude SP/AP complex and small ABR waveforms are described. The need for external adjustment of the AP/wave V amplitude ratio has been demonstrated in order to obtain the satisfactory recording.