Across-site patterns of MDTs for 14 subjects. Each panel shows data for one subject. MDTs measures at 70% of DR (filled symbols) and 30% of DR (open symbols) are plotted as a function of stimulation site. Error bars show the two MDTs obtained for each level at each site and the open and filled circles show the means of these two values. Stimulation sites are numbered in order from the most basal electrode in the 22-electrode array (Site 1) to the most apical electrode (Site 22). Subject numbers are given in the lower left corner of each panel. The variances shown in each panel are the across-site variance for MDTs measured at 70% of DR (top number) and the across-site variance for MDTs measured at 30% of DR (bottom number). The mean of these two variances was used to order the panels with the data for the subject with the highest mean variance shown in the upper left-hand panel and the subject with the lowest mean variance shown in the lower right-hand panel.
Across-subject mean MDTs for each of three segments of the implant. Basal segment (B)=Sites 1–8; middle segment (M)=Sites 9–15; apical segment (A)=Sites 16–22. MDTs for all tested sites within each segment were averaged. Mean MDTs measures at 30% of DR and 70% of DR are shown. The asterisk indicates a significant difference between the mean MDTs for the apical and middle segments at 30% of DR in a post-hoc Tukey test.
Scatterplots illustrating the correlations between mean MDTs for all sites and MDTs at Site 11 (left-hand panel) or the mean MDT for Sites 4, 11 and 18 (right-hand panel) at 70% of DR (filled circles) and 30% of DR (open squares). The filled and open triangles pointing to the abscissa represent the medians of the MDTs across all 14 subjects at Site 11 (left-hand panel) and at Sites 4, 11, and 18 (right-hand panel) for 70% and 30% of DR, respectively. The filled and open triangles pointing to the ordinate represent the medians of the MDTs across all 14 subjects at all sites for 70% and 30% of DR, respectively.
Demographic and clinical characteristics of the subjects used in the current study.
Bivariate correlations between individual subjects’ modulation detection thresholds (MDTs) and detection threshold levels ( levels; column 2), maximum comfortable loudness levels ( levels; column 3), and dynamic ranges (DRs; column 4) across all available stimulation sites. Asterisks indicate significance at the level.
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