fmSTCs from six Nucleus-22 cochlear-implant users who were stimulated using a bipolar electrode configuration (BP, BP+1 or BP+2, corresponding to 0.75, 1.5, or 2.25 mm separations between the active and reference electrodes, respectively). Other features of the individual graphs are the same as those described for Fig. 2, except that only the lowest probe level is plotted.