14 newborn guinea pigs have been deafened three days after birth by bilateral destruction of the organ of Corti, and among them 8 have been supplied with a chronic auditory electric stimulation by means of an intracochlear implanted electrode. The histological study and the anatomical reconstructions of these animals' cochlear nuclei demonstrate that this chronic stimulation prevents, at least partially, these auditory pathway medullary formations from atrophy due to the cochlear destruction.
In the case of total deafness, the multichannel cochlear implant prosthesis constitutes a substantial improvement. It allows known words to be recognized without lip reading, with a great percentage of good responses. Clinical and phoniatric results are reported in 21 cases of patients with implants.
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