What's the difference between hallucination and illusion?

Hallucination


Definition:

  • (n.) The act of hallucinating; a wandering of the mind; error; mistake; a blunder.
  • (n.) The perception of objects which have no reality, or of sensations which have no corresponding external cause, arising from disorder or the nervous system, as in delirium tremens; delusion.

Example Sentences:

  • (1) The clinical picture was characterized by hallucinations and delirium.
  • (2) Adverse effects included nausea, light-headedness, dyskinesias, and hallucinations, all of which abated after the Sinemet dose was reduced.
  • (3) Cocaine produces simple hallucinations, PCP can produce complex hallucinations analogous to a paranoid psychosis, while LSD produces a combination of hallucinations, pseudohallucinations and illusions.
  • (4) In traditional Western psychiatric theory, seeing or hearing things that other people do not think are there could be termed a hallucination which is often considered indicative of underlying psychopathology.
  • (5) The observed psychiatric symptoms were classified into two categories: simple, including incidents of confusion alone or hallucinations with preserved insight, and complex, including delusions or chronic confusion without preserved insight.
  • (6) The probability of hallucinations was associated with the severity of cognitive dysfunction, the degree of other behavioral disturbances, and the presence of extrapyramidal signs.
  • (7) This was generally mild and always fully reversible and consisted mainly of forgetfulness, occasionally hallucinations, nightmares and somnolence.
  • (8) Schizophrenia is a severe psychiatric disorder characterized by onset in young adulthood, the occurrence of hallucinations and delusions, and the development of enduring psychosocial disability.
  • (9) Improved assessments of hallucinating patients are recommended, with exploration of subtleties in the hallucinatory experience; and factors needing assessment are identified.
  • (10) Within the primitive maternal transference, borborygmi are often accompaniments to the fantasy or the hallucination of being fed by the analyst.
  • (11) These data indicate that hallucinations (i.e., believed-in imaginings) can be elicited from a minority of "norman" subjects with brief instructions.
  • (12) Intravenous injection of naloxone (in most cases 4.0 mg) induced a reduction of psychotic symptomatology (especially hallucinations) in the majority of patients.
  • (13) Is voice search really going to catch on, or is it some sort of consensual hallucination by the tech industry?
  • (14) Hallucinations of ocular origin, however, are easily diagnosed by a thorough eye examination.
  • (15) The clinical picture is near-monthly recurrence of episodes of stupor or excitement lasting about 1 or 2 weeks, which are accompanied by delusion and in some cases also by hallucinations or confusion.
  • (16) A case study is presented of the effects of wearing an ear-plug in a single patient with persistent auditory hallucinations.
  • (17) Following the presentation of this underdiagnosed clinical phenomenon we propose that musical hallucinations should be addressed as a final outcome of several factors including both mental and physical components.
  • (18) Social isolation did not affect the incidence of hallucination, nor was it related to the incidence of known depressive illness.
  • (19) The results indicate fair concordance between the two clinical approaches and the DIS with regard to the presence of any delusional or hallucination symptoms.
  • (20) Moreau de Tours's classical studies about haschisch had pointed out to a rich symptomatology: visual and auditive hallucinations preceded by the "primordial effect": "the dissociation of ideas".

Illusion


Definition:

  • (n.) An unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination.
  • (n.) Hence: Anything agreeably fascinating and charning; enchantment; witchery; glamour.
  • (n.) A sensation originated by some external object, but so modified as in any way to lead to an erroneous perception; as when the rolling of a wagon is mistaken for thunder.
  • (n.) A plain, delicate lace, usually of silk, used for veils, scarfs, dresses, etc.

Example Sentences:

  • (1) By using various colors, it is possible to tattoo a nipple-areola complex onto the breast that will have an illusion of projection.
  • (2) Apnea monitoring did not prevent, and in fact perpetrated the illusion of SIDS in this infant.
  • (3) Pope Francis’s no-longer-secret meeting in Washington DC with anti-gay activist Kim Davis, the controversial Kentucky county clerk who was briefly jailed over her refusal to issue same-sex marriage licenses in compliance with state law, leaves LGBT people with no illusions about the Pope’s stance on equal rights for us, despite his call for inclusiveness.
  • (4) Cocaine produces simple hallucinations, PCP can produce complex hallucinations analogous to a paranoid psychosis, while LSD produces a combination of hallucinations, pseudohallucinations and illusions.
  • (5) They must be kept secret because publication would destroy the illusion of a royal neutrality no one in power thinks exists any more.
  • (6) They impose the illusion of order on a chaotic life; they cement our place within and commitment to a collective.
  • (7) The preliminary experiments described here suggest that tilt aftereffects and illusions induced by projected slides of tilted real-object scenes have angular functions similar to that induced by a line grating.
  • (8) These variants, which yielded a robust illusion, included dihedral angles in place of the arrowheads of the classical pattern.
  • (9) During vibration of the depressor muscles with the mandible in its rest position the subjects underestimated an opening movement, but fixation of the mandible caused no illusions of movement.
  • (10) Stimuli were circular beams of light projected on screens (Delboef type of illusion).
  • (11) The director John Hillcoat and I were under no illusions.
  • (12) When the shaft is shortened and reaches neither of the vertices of the two pairs of wings, a reversed Müller-Lyer illusion is observed: a shaft between inward-pointing wings appears to be longer than a shaft between the outward-pointing wings.
  • (13) An illusion is something done one way that looks the other, like if you put a mirror in front of a pencil so the pencil looks like it's somewhere else.
  • (14) The subjects were asked to relate dreams, thoughts, or other mental illusions experienced during G-LOC episodes.
  • (15) While Yarmolenko stayed quiet, Stepanenko left no illusions as to his interpretation.
  • (16) The count of publications on geometric-optical illusions and the bibliography of extant books on the topic are brought up to date.
  • (17) The illusion is of watching a prima ballerina dancing only for you.
  • (18) Is Sisi’s UK visit going to fill my car with gas?’ A lot of people are increasingly disenchanted with the government, simply because it is failing to live up to its own illusions of grandeur.” Among the disenchanted are thousands of workers in the critical textiles sector who are striking over pay and conditions.
  • (19) Four experiments were conducted to investigate the role of "large" squares on the occurrence of assimilation and contrast in the Baldwin illusion.
  • (20) It creates a dangerous illusion that simply by reducing sugar intake, one can eradicate obesity.