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Auditory neuropathy is a rare type of hearing loss. It is caused by disruption of the nerve impulses travelling from the inner ear to the brain, although what causes this is unknown, and there is no cure. Both ears are usually affected, and the hearing loss ranges from mild to severe.

27) — Deaf people sense vibration in the part of the brain that other people use for hearing — which helps explain how deaf musicians can sense music, and how deaf people can enjoy concerts and other musical events.

Often times, when deaf people listen to music, they turn the volume up high so that they are able to feel the bass. They are able to recognize instruments, pitch, and rhythm all from feeling the bass. Some have even dedicated their vocation to music by producing, singing, and playing instruments.

These auditory hallucinations might be alarming, but they aren't a sign of mental illness. They are probably due to your auditory system and brain producing its own music because of the loss of hearing. While it is disturbing for some people, many people get used to it or even come to like it.

Those with partial hearing loss can still hear pitch but might struggle to perceive higher pitches. And while those who are completely deaf won't hear pitch, they can often feel and therefore perceive pitch.

Similar to how an “inner voice” of a hearing person is experienced in one's own voice, a completely deaf person sees or, more aptly, feels themselves signing in their head as they “talk” in their heads.

A loss of spatial hearing presents itself as the inability to distinguish spatial cues. For example, if a person suffers from spatial loss of hearing, they would likely be unable to tell where a sound came from. They would also have a difficult time picking one person's voice out of a crowd.