The Auditory nerve connects the inner ear to the brain stem. It is stimulated by the information received form the ears. I am not sure exactly what your question is but the benefit that you wife will get from the hearing aids will depend on a number of factors like the type, degree and cause of the hearing loss. The success of a hearing aid fitting further depends on the type of the technology matched to the type of problem present. If you have any further more specific questions, please write to me again and i will gladly discuss it in more detail.
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