Hallucination
From The Art and Popular Culture Encyclopedia
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A hallucination is a sensory perception in the absence of an external stimulus. It may occur in any sensory modality - visual, auditory, olfactory, gustatory, tactile or mixed.
Florid hallucinations are usually associated with drug use, (particularly hallucinogenic drugs), sleep deprivation, psychosis or neurological illness. --http://en.wikipedia.org/wiki/Hallucination
