system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Who are the voices that schizophrenic people hear in their head?(When they 'hear voices')

Where exactly do they come from?
gpt
Think about how you can imagine a voice in your head, anyone's voice: You know what your mother sounds like, your lover, your best friend. You can imagine all of these, and you can know what they sound like in your head.

The makes schizophrenia different is that a schizophrenic's brain registers these imaginations the same way it would register a *real* sound. The brain reacts the same way it would react to actual sounds, but in reality it is something purely made up by the brain itself, and incorrectly registered as having an outside source.

In reality, the sound doesn't actually exist. They just experience it as if it does.