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[[Hallucination]]s are usually defined in [[psychiatry]] as "false perceptions," that is, perceptions which arise "in the absence of an appropriate external stimulus."<ref>American Psychiatric Association. 1987. p.398</ref>
[[Hallucination]]s are a typical phenomenon of [[psychosis]], and are usually auditory (hearing voices), but may also be visual, somatic, tactile, olfactory, or gustatory.