Figure 1.

x-ray image of a child (participant 10) who received bilateral cochlear implants. Rectangles highlight the intracochlear electrode arrays. Schematics of the arrays for 2 different Nucleus 24 devices are also shown courtesy of Cochlear Ltd. (Sydney, Australia). Both arrays are the same length, with 22 stimulating electrodes, and two reference electrodes (ball electrode placed under the temporalis muscle and plate electrode placed with the receiver stimulator and embedded on the skull). However, Contour arrays are precurved to place the electrodes closer to the inner wall of the cochlea (modiolus), and thus to the primary auditory neurons, and have half banded electrodes with decreasing distance between adjacent electrodes in the apical end compared with regularly spaced full-band electrodes in the straight 24M array.