They work by electrically stimulating the auditory nerve (nerve of hearing ).
From here, the ' sound message ' is passed along the auditory nerve to the brain.
Hearing loss is caused by a number of different problems that occur either in the auditory nerve or in parts of the middle or inner ear.
This movement stimulates the auditory nerve and sends messages about sound to the brain.
When these hair cells stop functioning, the auditory nerve is not stimulated, and the child cannot hear.