illusion

A false perception; the mistaking of something for what it is not. [L. illusio, fr. il- ludo, pp. -lusus, to play at, mock]
- i. of doubles SYN: Capgras syndrome.
- i. of movement successive stimulation of neighboring retinal points which causes the sensation of movement.
- oculogravic i. apparent movement of the visual field when the body is subjected to acceleration; due to gravity.
- oculogyral i. an i. occurring in angular acceleration in which the position of fixed light appears to drift.
- optical i. a false interpretation of the color, form, size, or movement of a visual sensation.

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il·lu·sion il-'ü-zhən n
1) a misleading image presented as a visual stimulus
2 a) perception of something objectively existing in such a way as to cause misinterpretation of its actual nature esp OPTICAL ILLUSION compare DELUSION (2)
b) HALLUCINATION (1)
c) a pattern capable of reversible perspective
il·lu·sion·al -'üzh-nəl, -ən-əl adj

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n.
a false perception due to misinterpretation of the stimuli arising from an object. For example, a patient may misinterpret the conversation of others as the voices of enemies conspiring to destroy him. Illusions can occur in quite normal people, when they are usually spontaneously corrected. They may also occur in almost any psychiatric syndrome, especially depression. Compare hallucination.
Optical illusions are perceptions that do not agree with the actual object in the external world. They are produced by deceptive qualities of the stimulus and are in no way pathological.

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il·lu·sion (ĭ-looґzhən) [L. illusio] a false or misinterpreted sensory impression; a false interpretation of a real sensory image. Cf. delusion. illusional adj

Medical dictionary. 2011.

Synonyms:

Look at other dictionaries:

  • Illusion — Illusion …   Deutsch Wörterbuch

  • ILLUSION — ILLUSI Métaphoriquement dérivé de la réduction psychologique des enchantements magiques et des découvertes de l’optique géométrique, couronnant, avec Kant, la critique relativiste de l’optimisme leibnizien, le concept moderne d’illusion a conquis …   Encyclopédie Universelle

  • illusion — ILLUSION. s. f. Apparence, ou artifice, dont on trompe un homme. Ce n est rien de solide, ce n est qu une illusion, une pure illusion, une belle illusion Il se dit plus ordinairement des tromperies que font les demons, en faisant paroistre aux… …   Dictionnaire de l'Académie française

  • Illusion — Il*lu sion, n. [F. illusion, L. illusio, fr. illudere, illusum, to illude. See {Illude}.] 1. An unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination. [1913 Webster] To cheat the eye… …   The Collaborative International Dictionary of English

  • Illusion — Sf std. (18. Jh.) Entlehnung. Entlehnt aus frz. illusion und l. illūsio ( ōnis), dieses zu l. illūdere (illūsum) täuschen, betrügen, verspotten , zu l. lūdere (lūsum) Possen treiben, spielen, täuschen und l. in . Adjektiv: illusorisch;… …   Etymologisches Wörterbuch der deutschen sprache

  • illusion — [i lo͞o′zhən] n. [ME illusioun < OFr illusion < L illusio, a mocking (in LL(Ec), deceit, illusion) < illusus, pp. of illudere, to mock, play with < in , on + ludere, to play: see LUDICROUS] 1. a false idea or conception; belief or… …   English World dictionary

  • Illusion — Illusion, (v. lat.), 1) Betrug, Täuschung der Sinne; 2) täuschende Nachahmung, bei allen Kunstwerken, deren Absicht auf Nachahmung der Natur geht, ein unerläßliches Erforderniß. Daher Illusorisch, was die Illusion befördert; täuschend …   Pierer's Universal-Lexikon

  • illusion — I (deception) noun aberration, distortion, fallacy, false impression, misbelief, misconception, prestidigitation II (impression) noun apparition, artifice, chimera, daydream, deception, delusion, dream, figment, hallucination, masquerade, mirage …   Law dictionary

  • illusion — (n.) mid 14c., act of deception, from O.Fr. illusion a mocking, deceit, deception (12c.), from L. illusionem (nom. illusio) a mocking, jesting, irony, from illudere mock at, lit. to play with, from assimilated form of in at, upon (see IN (Cf. in… …   Etymology dictionary

  • Illusion — »Wunschbild, Selbsttäuschung«: Das Fremdwort wurde im 17. Jh. aus gleichbed. frz. illusion entlehnt, das auf lat. illusio »Verspottung, Täuschung; eitle Vorstellung« zurückgeht. Dies gehört zu lat. il ludere (< inludere) »hinspielen, sein… …   Das Herkunftswörterbuch

  • illusion — [n] false appearance; false belief apparition, bubble*, chimera, confusion, daydream, deception, déjè vu*, delusion, error, fallacy, false impression, fancy, fantasy,  figment of imagination*, fool’s paradise*, ghost, hallucination, head trip*,… …   New thesaurus

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