A preliminary report on a multiple-channel cochlear implant operation

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Abstract
A patient having a multiple-electrode array implanted into the scala tympani was studied. This intracochlear system uses an electrode array with interleaving ground and active electrode. Electric stimulation with this array reduces the spread of electric current in the scala tympani, reducing the size of the overlapping fiber population stimulated by adjacent electrodes. An implanted receiver stimulator used to drive the electrodes allows experimentation with different coding strategies. The psychological and physiological considerations of hearing are discussed and a speech coding scheme is proposed. This proposal accounts for the major factors (electrode placement and pulse rate) influencing the perception of spectral color and pitch.

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