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hallucination(ha-loos-i-na'shon) [L. hallucinari, to wander in one's mind]
A false perception having no relation to reality and not accounted for by any exterior stimulus. It is a dreamlike (or nightmarish) perception occurring while awake. It may be visual, esp. in medical illnesses or drug withdrawal syndromes; auditory, esp. in psychoses; tactile; gustatory; or olfactory. Affected patients typically appear confused and agitated and are unable to distinguish between the real and the imaginary. See: delusion; illusion
An imaginary perception of sounds, usually voices. Auditory hallucinations are a hallmark of psychotic illnesses but are also heard by patients with acquired hearing impairments and by some persons with temporal lobe seizures.
An auditory hallucination in which a person hears a voice demanding that he or she engage in a specific (and often, a dangerous) behavior. Command hallucinations are characteristic of both schizophrenia and some forms of drug intoxication. Affected people may report receiving instructions to kill themselves or others; to comply or be punished; or to undertake a particular behavior to make amends for prior faults or sins they have committed.
A hallucination that arises from outside the normal sensory field or range, as people having the sensation of seeing something behind them.
The sense of tasting something that is not present.
A hallucination pert. to touching the skin or to sensations of temperature or pain.
A colloquial term for “auditory hallucination.”
A presleep phenomenon having the same practical significance as a dream but experienced during consciousness. It may include a sense of falling, of sinking, or of the ceiling moving.
A sensation of flying or of moving the body or a part of it.Synonym: motor hallucination
A hallucination in which things seem smaller than they are.
motor hallucinationKinetic hallucination.
A hallucination involving the sense of smell.
release hallucinationCharles Bonnet syndrome.
A sensation of pain attributed to visceral injury.
stump hallucinationSee: phantom limb
A false sense of touching something or of objects moving on the skin. This abnormal perception is a hallmark of some withdrawal states, such as delirium tremens in alcohol withdrawal. See: formication
The sensation of seeing objects that are not really there. This is a hallmark of alcohol and drug withdrawal and of other medical illnesses that adversely affect the brain.
visual release hallucinationCharles Bonnet syndrome.
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