The method works best cases where total deafness is due to malfunctioning of the ear’s sensory cells.There must be sufficient functioning nerve fibers available to transmit the message to the brain（ ）;there are generally no more than 10 percent remaining in most cases,since they tend to atrophy with disuse.

The method works best cases where total deafness is due to malfunctioning of the ear’s sensory cells.There must be sufficient functioning nerve fibers available to transmit the message to the brain（ ）;there are generally no more than 10 percent remaining in most cases,since they tend to atrophy with disuse.