A cochlear implant is a sophisticated medical device designed for those who have severe to profound hearing loss when conventional hearing aids provide limited help. Rather than amplifying sound like a traditional hearing aid, it bypasses damaged parts of the inner ear and directly stimulates the auditory nerve with electrical signals. This neuroprosthetic approach is a powerful example of neural stimulation that can support full or partial hearing restoration. External processor: The mic on the external sound processor picks up sound, which is then converted into a digital signal. This device houses a microphone, a signal processing stage, and a transmitter coil that sends data to the internal implant. - Internal implant: Placed under the skin, the internal receiver-stimulator receives signals from the external processor and sends them to the electrode array. - Transmitter coil and electrode array: The transmitter coil communicates with the internal implant, and the electrode array sits inside the inner ear (cochlea) to deliver precise electrical stimulation to the auditory nerve. - Auditory nerve: The nerve that carries sound information from the cochlea to the brain. Electrical stimulation of the auditory nerve through the electrode array enables sound perception. - Sound processor: The overall system that processes sound, enabling clearer speech understanding in various listening environments.