Figure 4.

A, Data from individual children, shown by thin gray lines, and mean data, indicated by the thick black lines, show that the BD was evoked by stimulation matched either at the apical (#20 and #18) or basal ends (#3) of the implanted array (BD was present more often in response to matched apical than matched basal stimulation). B, The latency of the BD to matched electrode stimulation was strongly tied to the mean latency of unilaterally evoked responses. BD amplitudes decreased as the mean unilaterally evoked wave eV latency increased, and increased as the mean unilaterally evoked amplitudes (of wave eV) increased. C, Large mismatches in place of stimulation eliminated the BD. D, Mean (dashes) and 95% confidence intervals of latencies and amplitudes of the two unilaterally evoked wave eVs are shown for both matched and mismatched place of bilateral CI stimulation. No significant amplitude differences were found indicating that absent BDs with large mismatches in place of bilateral stimulation cannot be explained by differences in evoked brainstem activity.