Figure 2.

A, The electrically evoked auditory brainstem response is characterized by a large stimulus artifact followed by 3 positive amplitude peaks. These correspond to relays of neural activity along the auditory brainstem and midbrain. B–D, Typical EABR waveforms (2 replications each) from two recording channels [CZ (midline cephalic location) referenced to A1 (left earlobe) in Channel 1 and to A2 (right earlobe) in Channel 2] are shown for 3 stimulus conditions: CI1 evoked (B), CI2 evoked (C), and binaurally evoked (D). E, F, Mathematically generated waveforms are also shown: summed CI1- and CI2-evoked responses (E) and the derived BD waveform (F).