The periodicity and place-pitch modulation data, along with the data on loudness, offers promise of the development of a multielectrode, multichannel cochlear auditory prosthesis. Also, the currents required for cochlear stimulation are of the magnitude which can pass across the electrode-perilymph interface, by double-layer charging, without production of toxic by-products of electrolysis(6), supporting the feasibility of long-term chronic stimulation.