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A sensory perception in the absence of an actual external stimulus; to be
distinguished from an illusion, which is a misperception of misinterpretation of
an external stimulus. Hallucinations may involve any of the senses.
- auditory hallucination
Perception of sound, most frequently of voices but sometimes of clicks or
other noises.
- olfactory hallucination
Perception of odor such as of burning rubber or decaying fish.
- somatic hallucination
Perception of a physical sensation within the body such as a feeling of
electricity running through one's body.
- tactile hallucination
Perception of being touched or of something being under one's skin such as
the sensation of pins being stuck into one's finger. The sensation of
something crawling under one's skin is called formication; it occurs most
frequently in alcohol withdrawal syndrome and in cocaine withdrawal.
- visual hallucination
Perception of an image such as people (formed) or a flash of light
(unformed).
Source: Edgerton, Jane E. 1994. American Psychiatric Glossary, 7th Edition. Washington, DC: American Psychiatric Press
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