Abstract
Although the final chapter has not been written on the surgical and medical management of the various types of conductive hearing loss, many significant inroads have been made. 1,2 The patient with a perceptive hearing loss, on the other hand, can expect only rehabilitative assistance. Here, unfortunately, where the hearing aid is the most needed, it is the least effective. Some individuals with sensorineural loss, however, have retained normal or near-normal hearing for certain frequencies (Fig. 2, A and B ). The thought arose that perhaps it might be possible to take advantage of such active areas in the organ of Corti by electronic techniques. Obviously the ear with a uniform loss for all frequencies seems beyond electronic help; but in acoustic trauma, some types of neurotoxic loss, congenital deafness, and presbycusis, certain areas of the nerve appear to remain intact. It appears logical that if the information transmitted in
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