Hearing aids are most helpful for people with hearing loss brought on by damage to the tiny sensory cells in the inner ear, known as hair cells, in terms of improving hearing and speech comprehension. Sensorineural hearing loss is the name given to this kind of hearing aids. The harm may be brought on by illness, ageing, or trauma from noise or specific medications.
Hearing aids amplify the sound waves that reach the ear. The larger vibrations are picked up by remaining hair cells, which translate them into neural signals and send them to the brain. A person's hearing loss will be more severe and require more hearing aid amplification the more harm they have done to their hair cells.
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