The apparent, often strong subjective perception of an object or event when no such stimulus or situation is present; may be visual, auditory, olfactory, gustatory, or tactile. [L. alucinor, to wander in mind]
- auditory h. a symptom frequently observed in a schizophrenic disorder consisting, in the absence of an external source, of hearing a voice or other auditory stimulus that other individuals do not perceive.
- command h. a symptom, usually auditory but sometimes visual, consisting of a message, from no external source, to do something.
- formed visual h. h. composed of scenes, often landscapes.
- gustatory h. the sensation of taste in the absence of a gustatory stimulus; may be seen in temporal lobe epilepsy.
- haptic h. the sensation of touch in the absence of stimuli; may be seen in alcoholic delirium tremens.
- hypnagogic h. h. occurring when going to sleep in the period between wakefulness and sleep; one of the components of narcolepsy.
- hypnopompic h. vivid hallucinations that occur when wakening from sleep; occurs with narcolepsy, but grouped with hypnagogic h..
- kinesthesia h. the sense of movement of one or more muscles, when no movement is taking place.
- lilliputian h. h. of reduced size of objects or persons.
- mood-congruent h. h. in which the content is mood appropriate.
- mood-incongruent h. h. that is not consistent with external stimuli; content is not consistent with either manic or depressed mood.
- olfactory h. false perception in smell.
- stump h. SYN: phantom limb pain.
- tactile h. false perception of movement or sensation, as from an amputated limb, or crawling sensation on the skin.
- unformed visual h. h. composed of sparks, lights, or bursting spheres of light.

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hal·lu·ci·na·tion hə-.lüs-ən-'ā-shən n
1) a perception of something (as a visual image or a sound) with no external cause usu. arising from a disorder of the nervous system (as in delirium tremens or in functional psychosis without known neurological disease) or in response to drugs (as LSD) compare DELUSION (2), ILLUSION (2a)
2) the object of a hallucinatory perception

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a false perception of something that is not really there. Hallucinations may be visual, auditory, tactile, gustatory (of taste), or olfactory (of smell). They may be provoked by psychological illness (such as schizophrenia) or physical disorders in the brain (such as temporal lobe epilepsy or stroke) or they may be caused by drugs or sensory deprivation. Hallucinations should be distinguished from dreams and from illusion (since they occur at the same time as real perceptions and are not based upon real stimuli).

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hal·lu·ci·na·tion (hə-loo″sĭ-naґshən) [L. hallucinatio; Gr. alyein to wander in the mind] a sense perception without a source in the external world; a perception of an external stimulus object in the absence of such an object.

Medical dictionary. 2011.

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  • hallucination — [ a(l)lysinasjɔ̃ ] n. f. • 1660; lat. hallucinatio 1 ♦ Méd. Perception pathologique de faits, d objets qui n existent pas, de sensations en l absence de tout stimulus extérieur. ⇒ illusion, onirisme, rêve. Hallucinations visuelles (⇒ mirage,… …   Encyclopédie Universelle

  • Hallucination — Hal*lu ci*na tion ( n[=a] sh[u^]n), n. [L. hallucinatio: cf. F. hallucination.] 1. The act of hallucinating; a wandering of the mind; error; mistake; a blunder. [1913 Webster] This must have been the hallucination of the transcriber. Addison.… …   The Collaborative International Dictionary of English

  • hallucination — (n.) in the pathological/psychological sense of seeing or hearing something which is not there, 1640s, from L. hallucinationem (nom. hallucinatio), from pp. stem of hallucinari (see HALLUCINATE (Cf. hallucinate)). Hallucination is distinct from… …   Etymology dictionary

  • Hallucination — (v. lat., Sinnestäuschung), 1) im Allgemeinen diejenige sinnliche Vorstellung, welche nicht durch einen wirklichen Gegenstand der Wahrnehmung, also von außen, erregt wird, sondern der eigenen Thätigkeit des Organismus u. namentlich des… …   Pierer's Universal-Lexikon

  • hallucination — index figment, insanity, phantom Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • hallucination — • hallucination, sinnesvilla, synvilla, skenbild, inbillning, illusion, drömbild, irrbild • inbillning, fantasi, illusion, dröm, villfarelse, fiktion …   Svensk synonymlexikon

  • hallucination — *delusion, mirage, illusion Analogous words: *apparition, phantasm, phantom, wraith: fantasy, *fancy, vision, dream, nightmare …   New Dictionary of Synonyms

  • hallucination — [n] dream, delusion aberration, apparition, fantasy, figment of the imagination*, head trip*, illusion, mirage, phantasm, phantasmagoria, phantom, trip*, vision, wraith; concepts 529,532,690 Ant. experience, fact, reality, truth …   New thesaurus

  • hallucination — [hə lo͞o΄si nā′shən] n. [L hallucinatio < hallucinari: see HALLUCINATE] 1. the apparent perception of sights, sounds, etc. that are not actually present: it may occur in certain mental disorders 2. the imaginary object apparently seen, heard,… …   English World dictionary

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  • hallucination —    Formerly known as hallucinatio, allucinatio, alucinatio, * alusia, * fallacia, * idolum, and *phantasma. Hallucination can be defined as a percept, experienced by a waking individual, in the absence of an appropriate stimulus from the… …   Dictionary of Hallucinations

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