What causes auditory hallucinations in the brain? For example, when you are sleep deprived, it is possible to hear things very clearly as if they were real. For example, voices of people talking, which some people with schizophrenia experience commonly in their daily lives. But of course there is no input from the ears. So what exactly is happening and how is that possible?
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Auditory input is processed in parts of the thalamus, so you can hallucinate a sound when there is a signal sent to that brain centre responsible for processing sounds even there is no stimulus (such as in hallucination). High levels of serotonin (a neurotransmitter in the brain) can sometimes cause auditory hallucination (as seen with some drug use and in cases of schizophrenia). Source: my own neurology studies.
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