FIGURE 9.

The shorter the cochlear diameter (<9.5 mm) and the deeper the apical insertion angle (>350 degrees), the more likely the 500-Hz maximum on the electrode sweep would present at a more basal intracochlear electrode than the most-apical one (i.e., the more likely the electrode is to cross the CF place for 500-Hz). (A) Maximum ECochG response along the entire array for both 250- and 500-Hz (i.e., electrode sweep maximum) as a function of cochlear diameter. The gray region highlights that for cochlear diameter <9.5 mm, where there may be a possibility that the perimodiolar electrode may pass the 500-Hz CF during the insertion. (B) Maximum ECochG response on electrode sweep for both 250- and 500-Hz as a function of apical insertion angle. For apical insertion angles >350 degrees, there is a possibility that the electrode may pass the CF for 500-Hz during the insertion. Electrode sweep peak is numbered from 1–22, where 22 is the most-apical electrode and 1 is the most basal electrode.