For questions regarding perception of a stimulus without any actual stimulus being present, particularly in the context of psychiatric illness or recreational drug use

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Is it possible to become addicted to sleep deprivation?

Background: After staying awake for an entire night without sleeping medication, some individuals report feeling tired while others report feeling euphoric and at some point begin to hallucinate with ...
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Why hallucinations appear in depression?

We all know the stories of people who saw a miracle in the deepist troubles like gangsters who turned to faith - or an older example could be the miracles in jail in the Bible (Acts: Peter and Paul). ...
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How do auditory and visual hallucinations differ within the brain?

I asked this question How are hallucinations generated, is it related to dreaming?. It occurs to me that auditory hallucinations may well be generated in a different part of the brain to visual ...