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780.1}}|ICDO =|OMIM =|MedlinePlus = 003258|eMedicineSubj =|eMedicineTopic =|MeshID = D006212}}A hallucination is a perception in the absence of external stimulus that has qualities of real perception. Hallucinations are vivid, substantial, and are perceived to be located in external objective space. They are distinguishable from several related phenomena, such as dreaming, which does not involve wakefulness; pseudohallucination, which does not mimic real perception, and is accurately perceived as unreal; illusion, which involves distorted or misinterpreted real perception; and imagery, which does not mimic real perception and is under voluntary control.JOURNAL, Leo P. W. Chiu, 1989, Differential diagnosis and management of hallucinations, Journal of the Hong Kong Medical Association, t 41, 3, 292–7,weblink PDF, Hallucinations also differ from "delusional perceptions", in which a correctly sensed and interpreted stimulus (i.e., a real perception) is given some additional (and typically absurd) significance.Hallucinations can occur in any sensory modality—visual, auditory, olfactory, gustatory, tactile, proprioceptive, equilibrioceptive, nociceptive, thermoceptive and chronoceptive.A mild form of hallucination is known as a disturbance, and can occur in most of the senses above. These may be things like seeing movement in peripheral vision, or hearing faint noises and/or voices. Auditory hallucinations are very common in schizophrenia. They may be benevolent (telling the subject good things about themselves) or malicious, cursing the subject, etc. Auditory hallucinations of the malicious type are frequently heard,{{Citation needed|date=August 2016}} for example people talking about the subject behind their back. Like auditory hallucinations, the source of the visual counterpart can also be behind the subject's back. Their visual counterpart is the feeling of being looked or stared at, usually with malicious intent.{{Citation needed|date=August 2016}} Frequently, auditory hallucinations and their visual counterpart are experienced by the subject together.{{Citation needed|reason= Your statement is not supported by any valid source|date=December 2017}}Hypnagogic hallucinations and hypnopompic hallucinations are considered normal phenomena. Hypnagogic hallucinations can occur as one is falling asleep and hypnopompic hallucinations occur when one is waking up. Hallucinations can be associated with drug use (particularly deliriants), sleep deprivation, psychosis, neurological disorders, and delirium tremens.The word "hallucination" itself was introduced into the English language by the 17th-century physician Sir Thomas Browne in 1646 from the derivation of the Latin word alucinari meaning to wander in the mind. For Browne, hallucination means a sort of vision that is "depraved and receive[s] its objects erroneously".Browne, Thomas (1646). Pseudodoxia Epidemica. Book III, chapter XVIII: That Moles are blinde and have no eyes.{{TOC limit|3}}

Classification

Hallucinations may be manifested in a variety of forms.JOURNAL, Chen E, Berrios GE, Recognition of hallucinations: a multidimensional model and methodology, Psychopathology, 29, 1, 54–63, 1996, 8711076, 10.1159/000284972, Various forms of hallucinations affect different senses, sometimes occurring simultaneously, creating multiple sensory hallucinations for those experiencing them.

Visual

{{see also|Visual hallucinations in psychosis|Pareidolia|Palinopsia}}A visual hallucination is "the perception of an external visual stimulus where none exists".WEB, Pelak, Victoria, Approach to the patient with visual hallucinations,weblink www.uptodate.com, 2014-08-25, no,weblink" title="web.archive.org/web/20140826120056weblink">weblink 2014-08-26, Alternatively, a visual illusion is a distortion of a real external stimulus. Visual hallucinations are separated into simple and complex.
  • Simple visual hallucinations (SVH) are also referred to as non-formed visual hallucinations and elementary visual hallucinations. These terms refer to lights, colors, geometric shapes, and indiscrete objects. These can be further subdivided into phosphenes which are SVH without structure, and photopsias which are SVH with geometric structures.
  • Complex visual hallucinations (CVH) are also referred to as formed visual hallucinations. CVHs are clear, lifelike images or scenes such as people, animals, objects, etc.
For example, one may report hallucinating a giraffe. A simple visual hallucination is an amorphous figure that may have a similar shape or color to a giraffe (looks like a giraffe), while a complex visual hallucination is a discrete, lifelike image that is, unmistakably, a giraffe.

Auditory

Auditory hallucinations (also known as paracusia)WEB,weblink Paracusia, thefreedictionary.com, are the perception of sound without outside stimulus. Auditory hallucinations are the most common type of hallucination.BOOK, Nolen-Hoeksema, Susan, Abnormal Psychology, 2014, McGraw-Hill, 283, 6e, Auditory hallucinations can be divided into two categories: elementary and complex. Elementary hallucinations are the perception of sounds such as hissing, whistling, an extended tone, and more. In many cases, tinnitus is an elementary auditory hallucination. However, some people who experience certain types of tinnitus, especially pulsatile tinnitus, are actually hearing the blood rushing through vessels near the ear. Because the auditory stimulus is present in this situation, it does not qualify it as a hallucination.Complex hallucinations are those of voices, music, or other sounds that may or may not be clear, may be familiar or completely unfamiliar, and friendly or aggressive, among other possibilities. A hallucination of a single individual person of one or more talking voices is particularly associated with psychotic disorders such as schizophrenia, and hold special significance in diagnosing these conditions.If a group of people experience a complex auditory hallucination, no single individual can be named psychotic or schizophrenic."Rescuers heard a voice" Ben Brumfield, CNN March 9, 2015 {{webarchive|url=https://web.archive.org/web/20150310012541weblink |date=March 10, 2015 }}"'Mysterious voice' led Utah Officers to child who survived for 14 hours in submerged car" Joel Landau, New York Daily News, March 9, 2015 {{webarchive|url=https://web.archive.org/web/20160628135631weblink |date=June 28, 2016 }}"Lily Groesbeck Rescue" NBC news {{webarchive|url=https://web.archive.org/web/20160812192955weblink |date=2016-08-12 }}WEB,weblink Rescuers recall 'distinct voice' that spurred them to rescue trapped toddler - KSL.com, ksl.com, Another typical disorder where auditory hallucinations are very common is dissociative identity disorder. In schizophrenia voices are normally perceived coming from outside the person but in dissociative disorders they are perceived as originating from within the person, commenting in their head instead of behind their back. Differential diagnosis between schizophrenia and dissociative disorders is challenging due to many overlapping symptoms, especially Schneiderian first rank symptoms such as hallucinations.JOURNAL, Shibayama M, 2011, Differential diagnosis between dissociative disorders and schizophrenia, Seishin shinkeigaku zasshi, 113, 9, 906–911, 22117396, However, many people not suffering from diagnosable mental illness may sometimes hear voices as well.WEB,weblink Hearing Voices: Some People Like It, Thompson, Andrea, LiveScience.com, September 15, 2006, 2006-11-25, no,weblink" title="web.archive.org/web/20061102150621weblink">weblink November 2, 2006, One important example to consider when forming a differential diagnosis for a patient with paracusia is lateral temporal lobe epilepsy. Despite the tendency to associate hearing voices, or otherwise hallucinating, and psychosis with schizophrenia or other psychiatric illnesses, it is crucial to take into consideration that, even if a person does exhibit psychotic features, he/she does not necessarily suffer from a psychiatric disorder on its own. Disorders such as Wilson's disease, various endocrine diseases, numerous metabolic disturbances, multiple sclerosis, systemic lupus erythematosus, porphyria, sarcoidosis, and many others can present with psychosis.Musical hallucinations are also relatively common in terms of complex auditory hallucinations and may be the result of a wide range of causes ranging from hearing-loss (such as in musical ear syndrome, the auditory version of Charles Bonnet syndrome), lateral temporal lobe epilepsy,Engmann, Birk; Reuter, Mike: "Spontaneous perception of melodies – hallucination or epilepsy?" Nervenheilkunde 2009 Apr 28: 217-221. {{ISSN|0722-1541}} arteriovenous malformation,JOURNAL, Ozsarac M, Aksay E, Kiyan S, Unek O, Gulec FF, De novo cerebral arteriovenous malformation: Pink Floyd's song "Brick in the Wall" as a warning sign, The Journal of Emergency Medicine, 43, 1, e17–20, 2012, 19682829, 10.1016/j.jemermed.2009.05.035, stroke, lesion, abscess, or tumor.WEB,weblink Rare Hallucinations Make Music In The Mind, ScienceDaily.com, August 9, 2000, 2006-12-31, no,weblink" title="web.archive.org/web/20061205053946weblink">weblink December 5, 2006, The Hearing Voices Movement is a support and advocacy group for people who hallucinate voices, but do not otherwise show signs of mental illness or impairment.High caffeine consumption has been linked to an increase in the likelihood of one's experiencing auditory hallucinations. A study conducted by the La Trobe University School of Psychological Sciences revealed that as few as five cups of coffee a day (approximately 500 mg of caffeine) could trigger the phenomenon.Medical News Today: "Too Much Coffee Can Make You Hear Things That Are Not There" {{webarchive|url=https://web.archive.org/web/20130311185810weblink |date=2013-03-11 }}

Command{{anchor|Command hallucination|Command hallucinations}}

Command hallucinations are hallucinations in the form of commands; they can be auditory or inside of the person's mind and/or consciousness. The contents of the hallucinations can range from the innocuous to commands to cause harm to the self or others.JOURNAL, Beck-Sander A, Birchwood M, Chadwick P, Acting on command hallucinations: A cognitive approach, The British Journal of Clinical Psychology, 36, 1, 139–48, 1997, 9051285, 10.1111/j.2044-8260.1997.tb01237.x, Command hallucinations are often associated with schizophrenia. People experiencing command hallucinations may or may not comply with the hallucinated commands, depending on the circumstances. Compliance is more common for non-violent commands.JOURNAL, Lee TM, Chong SA, Chan YH, Sathyadevan G, Command hallucinations among Asian patients with schizophrenia, The Canadian Journal of Psychiatry, 49, 12, 838–42, 2004, 15679207, 10.1177/070674370404901207, Command hallucinations are sometimes used to defend a crime that has been committed, often homicides.JOURNAL, Insanity Defense Evaluations: Toward a Model for Evidence-Based Practice, Knoll, James L., Resnick, Phillip J., Brief Treatment and Crisis Intervention, 2008, 8, 1, 92–110, 10.1093/brief-treatment/mhm024, 10.1.1.606.6552, In essence, it is a voice that one hears and it tells the listener what to do. Sometimes the commands are quite benign directives such as "Stand up" or "Shut the door."WEB, Shea, Sean Christopher, M.D,weblink no,weblink" title="web.archive.org/web/20140102191930weblink">weblink 2014-01-02, Whether it is a command for something simple or something that is a threat, it is still considered a "command hallucination." Some helpful questions that can assist one in figuring out if he/she may be suffering from this include: "What are the voices telling you to do?", "When did your voices first start telling you to do things?", "Do you recognize the person who is telling you to harm yourself (or others)?", "Do you think you can resist doing what the voices are telling you to do?"

Olfactory

Phantosmia (olfactory hallucinations), smelling an odor that is not actually there, and parosmia (olfactory illusions), inhaling a real odor but perceiving it as different scent than remembered,{{citation|title=Distorted Olfactory Perception: A Systematic Review|last1=Hong|first1=Seok-Chan|last2=Holbrook|first2=Eric H.|last3=Leopold|first3=Donald A.|last4=Hummel|first4=Thomas|year=2012|journal=Acta Oto-Laryngologica Supplementum|volume=132|issue=S1|page=S27}} are distortions to the sense of smell (olfactory system) that, in most cases, are not caused by anything serious and usually go away on their own in time. It can result from a range of conditions such as nasal infections, nasal polyps, dental problems, migraines, head injuries, seizures, strokes, or brain tumors.{{citation|last=Leopold|first=D. A.|year=2002|title=Distortion of Olfactory Perception: Diagnosis and Treatment|journal=Chemical Senses|volume=27|issue=7|pages=611–615|doi=10.1093/chemse/27.7.611|pmid=12200340}} Environmental exposures are sometimes the cause as well, such as smoking, exposure to certain types of chemicals (e.g., insecticides or solvents), or radiation treatment for head or neck cancer. It can also be a symptom of certain mental disorders such as depression, bipolar disorder, intoxication or withdrawal from drugs and alcohol, or psychotic disorders (e.g., schizophrenia). The perceived odors are usually unpleasant and commonly described as smelling burned, foul spoiled, or rotten.{{citation|title=Phantosmia (Smelling Odours That Aren't There)|author=HealthUnlocked|website=NHS Choices|year=2014|url=http://www.nhs.uk/conditions/phantosmia/Pages/Introduction.aspx|accessdate=6 August 2016|deadurl=no|archiveurl=https://web.archive.org/web/20160802124224weblink|archivedate=2 August 2016|df=}}

Tactile

Tactile hallucinations are the illusion of tactile sensory input, simulating various types of pressure to the skin or other organs. One subtype of tactile hallucination, formication, is the sensation of insects crawling underneath the skin and is frequently associated with prolonged cocaine use.JOURNAL, Berrios GE, Tactile hallucinations: conceptual and historical aspects, Journal of Neurology, Neurosurgery, and Psychiatry, 45, 4, 285–93, April 1982, 7042917, 491362, 10.1136/jnnp.45.4.285, However, formication may also be the result of normal hormonal changes such as menopause, or disorders such as peripheral neuropathy, high fevers, Lyme disease, skin cancer, and more.

Gustatory

This type of hallucination is the perception of taste without a stimulus. These hallucinations, which are typically strange or unpleasant, are relatively common among individuals who have certain types of focal epilepsy, especially temporal lobe epilepsy. The regions of the brain responsible for gustatory hallucination in this case are the insula and the superior bank of the sylvian fissure.BOOK, Panayiotopoulos CP, A clinical guide to epileptic syndromes and their treatment, 2007, Springer, London, 978-1846286438, 2nd, based on the ILAE classification and practice parameter guidelines, BOOK, Barker P, Assessment in psychiatric and mental health nursing: in search of the whole person, 1997, Stanley Thornes Publishers, Cheltenham, UK, 978-0748731749, 245,

General somatic sensations

General somatic sensations of a hallucinatory nature are experienced when an individual feels that their body is being mutilated, i.e. twisted, torn, or disembowelled. Other reported cases are invasion by animals in the person's internal organs such as snakes in the stomach or frogs in the rectum. The general feeling that one's flesh is decomposing is also classified under this type of hallucination.{{Citation needed|reason=I read the page of the book that you used as a source where it was supposed to be the content posted here but what I found has nothing to do with the data provided in this paragraph, so you did not provide an appropriate source.|date=December 2017}}

Cause

{{See also|Psychosis#Causes|l1=Psychosis (causes)}}Hallucinations can be caused by a number of factors.

Hypnagogic hallucination

These hallucinations occur just before falling asleep, and affect a high proportion of the population: in one survey 37% of the respondents experienced them twice a week.JOURNAL, Ohayon MM, Priest RG, Caulet M, Guilleminault C, Hypnagogic and Hypnopompic Hallucinations: Pathological Phenomena?, British Journal of Psychiatry, 169, 4, 459–67, 1996, 8894197, 10.1192/bjp.169.4.459, The hallucinations can last from seconds to minutes; all the while, the subject usually remains aware of the true nature of the images. These may be associated with narcolepsy. Hypnagogic hallucinations are sometimes associated with brainstem abnormalities, but this is rare.JOURNAL, 10.1093/brain/121.10.1819, 9798740, Complex visual hallucinations. Clinical and neurobiological insights, Brain, 121, 10, 1819–40, 1998, Manford, M,

Peduncular hallucinosis

Peduncular means pertaining to the peduncle, which is a neural tract running to and from the pons on the brain stem. These hallucinations usually occur in the evenings, but not during drowsiness, as in the case of hypnagogic hallucination. The subject is usually fully conscious and then can interact with the hallucinatory characters for extended periods of time. As in the case of hypnagogic hallucinations, insight into the nature of the images remains intact. The false images can occur in any part of the visual field, and are rarely (wikt:polymodal|polymodal).

Delirium tremens

One of the more enigmatic forms of visual hallucination is the highly variable, possibly polymodal delirium tremens. Individuals suffering from delirium tremens may be agitated and confused, especially in the later stages of this disease. Insight is gradually reduced with the progression of this disorder. Sleep is disturbed and occurs for a shorter period of time, with rapid eye movement sleep.

Parkinson's disease and Lewy body dementia

Parkinson's disease is linked with Lewy body dementia for their similar hallucinatory symptoms. The symptoms strike during the evening in any part of the visual field, and are rarely (wikt:polymodal|polymodal). The segue into hallucination may begin with illusionsMark Derr (2006) {{webarchive|url=https://web.archive.org/web/20110926153757weblink |date=2011-09-26 }} "Marilyn and Me," The New York Times, February 14, 2006 where sensory perception is greatly distorted, but no novel sensory information is present. These typically last for several minutes, during which time the subject may be either conscious and normal or drowsy/inaccessible. Insight into these hallucinations is usually preserved and REM sleep is usually reduced. Parkinson's disease is usually associated with a degraded substantia nigra pars compacta, but recent evidence suggests that PD affects a number of sites in the brain. Some places of noted degradation include the median raphe nuclei, the noradrenergic parts of the locus coeruleus, and the cholinergic neurons in the parabrachial area and pedunculopontine nuclei of the tegmentum.

Migraine coma

{{see also|Migraine aura|Scintillating scotoma}}This type of hallucination is usually experienced during the recovery from a comatose state. The migraine coma can last for up to two days, and a state of depression is sometimes comorbid. The hallucinations occur during states of full consciousness, and insight into the hallucinatory nature of the images is preserved. It has been noted that ataxic lesions accompany the migraine coma.

Charles Bonnet syndrome

Charles Bonnet syndrome is the name given to visual hallucinations experienced by a partially or severely sight impaired person. The hallucinations can occur at any time and can distress people of any age, as they may not initially be aware that they are hallucinating, they may fear initially for their own mental health which may delay them sharing with carers what is happening until they start to understand it themselves. The hallucinations can frighten and disconcert as to what is real and what is not and carers need to learn how to support sufferers. The hallucinations can sometimes be dispersed by eye movements, or perhaps just reasoned logic such as, "I can see fire but there is no smoke and there is no heat from it" or perhaps "We have an infestation of rats but they have pink ribbons with a bell tied on their necks." Over elapsed months and years the manifestation of the hallucinations may change, becoming more or less frequent with changes in ability to see. The length of time that the sight impaired person can suffer from these hallucinations varies according to the underlying speed of eye deterioration. A differential diagnosis are ophthalmopathic hallucinations.JOURNAL, Engmann, Birk, Phosphene und Photopsien – Okzipitallappeninfarkt oder Reizdeprivation?, Phosphenes and photopsias - ischaemic origin or sensorial deprivation? - Case history, Zeitschrift für Neuropsychologie, 19, 1, 7–13, 2008, 10.1024/1016-264X.19.1.7, German,

Focal epilepsy

Visual hallucinations due to focal seizures differ depending on the region of the brain where the seizure occurs. For example, visual hallucinations during occipital lobe seizures are typically visions of brightly colored, geometric shapes that may move across the visual field, multiply, or form concentric rings and generally persist from a few seconds to a few minutes. They are usually unilateral and localized to one part of the visual field on the contralateral side of the seizure focus, typically the temporal field. However, unilateral visions moving horizontally across the visual field begin on the contralateral side and move toward the ipsilateral side.JOURNAL, Teeple RC, Caplan JP, Stern TA, Visual Hallucinations: Differential Diagnosis and Treatment, The Primary Care Companion to the Journal of Clinical Psychiatry, 11, 1, 26–32, 2009, 19333408, 2660156, 10.4088/PCC.08r00673, Temporal lobe seizures, on the other hand, can produce complex visual hallucinations of people, scenes, animals, and more as well as distortions of visual perception. Complex hallucinations may appear to be real or unreal, may or may not be distorted with respect to size, and may seem disturbing or affable, among other variables. One rare but notable type of hallucination is heautoscopy, a hallucination of a mirror image of one's self. These "other selves" may be perfectly still or performing complex tasks, may be an image of a younger self or the present self, and tend to be only briefly present. Complex hallucinations are a relatively uncommon finding in temporal lobe epilepsy patients. Rarely, they may occur during occipital focal seizures or in parietal lobe seizures.Distortions in visual perception during a temporal lobe seizure may include size distortion (micropsia or macropsia), distorted perception of movement (where moving objects may appear to be moving very slowly or to be perfectly still), a sense that surfaces such as ceilings and even entire horizons are moving farther away in a fashion similar to the dolly zoom effect, and other illusions.JOURNAL, Bien CG, Benninger FO, Urbach H, Schramm J, Kurthen M, Elger CE, Localizing value of epileptic visual auras, Brain, 123, 2, 244–253, 2000, 10648433, 10.1093/brain/123.2.244, Even when consciousness is impaired, insight into the hallucination or illusion is typically preserved.

Drug-induced hallucination

Drug-induced hallucinations are caused hallucinogens, dissociatives, deliriants including many drugs with anticholinergic actions and certain stimulants, which are known to cause visual and auditory hallucinations. Some psychedelics such as lysergic acid diethylamide (LSD) and psilocybin can cause hallucinations that range from a spectrum of mild to severe.Hallucinations, pseudohallucinations, or intensification of pareidolia, particularly auditory, are known side effects of opioids to different degrees—it may be associated with the absolute degree of agonism and/or antagonism of especially the kappa opioid receptor, sigma receptors, delta opioid receptor and the NMDA receptors or the overall receptor activation profile as synthetic opioids like those of the pentazocine, levorphanol, fentanyl, pethidine, methadone and some other families are more associated with this side effect than natural opioids like morphine and codeine and semi-synthetics like hydromorphone, amongst which there also appears to be a stronger correlation with the relative analgesic strength. Three opioids, Cyclazocine (a benzormorphan opioid/pentazocine relative) and two levorphanol-related morphinan opioids, Cyclorphan and Dextorphan are classified as hallucinogens, and Dextromethorphan as a dissociative.WEB,weblink Archived copy, 2018-04-24, no,weblink 2018-04-24, WEB,weblink Archived copy, 2018-04-24, no,weblink 2018-04-25, WEB,weblink Archived copy, 2018-04-24, no,weblink" title="web.archive.org/web/20131615270100weblink">weblink 2018-05-09, WEB,weblink Prescription Drugs That Can Cause Hallucinations, azcentral.com, These drugs also can induce sleep (relating to hypnagogic hallucinations) and especially the pethidines have atropine-like anticholinergic activity, which was possibly also a limiting factor in the use, the psychotomometic side effects of potentiating morphine, oxycodone, and other opioids with scopolamine (respectively in the Twilight Sleep technique and the combination drug Skophedal, which was eukodal (oxycodone), scopolamine and ephedrine, called the "wonder drug of the 1930s" after its invention in Germany in 1928, but only rarely specially compounded today) (q.q.v.).JOURNAL, 10.1016/S0030-4220(57)80063-2, 13441284, The surgical correction of mandibular prognathism and retrognathia with consideration of genioplasty, Oral Surgery, Oral Medicine, Oral Pathology, 10, 7, 677–89; contd, 1957, Trauner, Richard, Obwegeser, Hugo,

Sensory deprivation hallucination

Hallucinations can be caused by sense deprivation when it occurs for prolonged periods of time, and almost always occur in the modality being deprived (visual for blindfolded/darkness, auditory for muffled conditions, etc.) {{Citation needed|date=December 2017}}

Experimentally-induced hallucinations

Anomalous experiences, such as so-called benign hallucinations, may occur in a person in a state of good mental and physical health, even in the apparent absence of a transient trigger factor such as fatigue, intoxication or sensory deprivation.The evidence for this statement has been accumulating for more than a century. Studies of benign hallucinatory experiences go back to 1886 and the early work of the Society for Psychical Research,Gurney, E., Myers, F.W.H. and Podmore, F. (1886). Phantasms of the Living, Vols. I and II. London: Trubner and Co..Sidgwick, Eleanor; Johnson, Alice; and others (1894). Report on the Census of Hallucinations, London: Proceedings of the Society for Psychical Research, Vol. X.
which suggested approximately 10% of the population had experienced at least one hallucinatory episode in the course of their life. More recent studies have validated these findings; the precise incidence found varies with the nature of the episode and the criteria of "hallucination" adopted, but the basic finding is now well-supported.See Slade, P.D. and Bentall, R.P. (1988). Sensory Deception: a scientific analysis of hallucination. London: Croom Helm, for a review.

Non-celiac gluten sensitivity

There is tentative evidence of a relationship with non-celiac gluten sensitivity, the so-called "gluten psychosis".JOURNAL, Losurdo G, Principi M, Iannone A, Amoruso A, Ierardi E, Di Leo A et al., Extra-intestinal manifestations of non-celiac gluten sensitivity: An expanding paradigm., World J Gastroenterol, 2018, 24, 14, 1521–1530, 29662290, 10.3748/wjg.v24.i14.1521, 5897856, Review,

Pathophysiology

Neuroanatomy

Hallucinations are associated with structural and functional abnormalities in primary and secondary sensory cortices. Reduced grey matter in regions of the superior temporal gyrus/middle temporal gyrus, including broca's area, is associated with auditory hallucinations as a trait, while acute hallucinations are associated with increased activity in the same regions along with the hippocampus, parahippocampus, and the right hemispheric homologue of broca's area in the inferior frontal gyrus.BOOK, Brown, Gregory, Thompson, Wesley, Swerdlow, Neal, Behavioral Neurobiology of Schizophrenia and its Treatment, Springer, 185–189, Functional Brain Imaging in Schizophrenia: Selected Results and Methods, Grey and white matter abnormalities in visual regions are associated with visual hallucinations in diseases such as alzheimer's disease, further supporting the notion of dysfunction in sensory regions underlying hallucinations.JOURNAL, Schmoldt, A, Benthe, HF, Haberland, G, Digitoxin metabolism by rat liver microsomes., Biochemical pharmacology, 1 September 1975, 24, 17, 1639–41, 10.1016/j.neubiorev.2007.07.012, 17884165, One proposed model of hallucinations posits that overactivity in sensory regions, which is normally attributed to internal sources via feedforward networks to the inferior frontal gyrus, is interpreted as originating externally due to abnormal connectivity or functionality of the feedforward network. This is supported by cognitive studies those with hallucinations, who demonstrate abnormal attribution of self generated stimuli.JOURNAL, Boksa, P, On the neurobiology of hallucinations., Journal of psychiatry & neuroscience : JPN, July 2009, 34, 4, 260–2, 19568476, 2702442, Disruptions in thalamocortical circuitry may underlie the observed top down and bottom up dysfunction.JOURNAL, Kumar, S, Soren, S, Chaudhury, S, Hallucinations: Etiology and clinical implications., Industrial psychiatry journal, July 2009, 18, 2, 119–26, 10.4103/0972-6748.62273, 21180490, 2996210, Thalamocortical circuits, composed of projections between thalamic and cortical neurons and adjacent interneurons, underlie certain electrophysical characteristics(gamma oscillations) that are underlie sensory processing. Cortical inputs to thalamic neurons enable attentional modulation of sensory neurons. Dysfunction in sensory afferents, and abnormal cortical input may result in pre-existing expectations modulating sensory experience, potentially resulting in the generation of hallucinations. Hallucinations are associated with less accurate sensory processing, and more intense stimuli with less interference are necessary for accurate processing and the appearance of gamma oscillations(called "gamma synchrony"). Hallucinations are also associated with the absence of reduction in P50 amplitude in response to the presentation of a second stimuli after an initial stimulus; this is thought to represent failure to gate sensory stimuli, and can be exacerbated by dopamine release agents.JOURNAL, Behrendt, RP, Dysregulation of thalamic sensory "transmission" in schizophrenia: neurochemical vulnerability to hallucinations., Journal of psychopharmacology (Oxford, England), May 2006, 20, 3, 356–72, 10.1177/0269881105057696, 16174672, Abnormal assignment of salience to stimuli may be one mechanism of hallucinations. Dysfunctional dopamine signaling may lead to abnormal top down regulation of sensory processing, allowing expectations to distort sensory input.BOOK, Aleman, Andre, Vercammon, Ans, Jardri, R, Cachia, A, Pins, D, Thomas, P, The Neuroscience of Hallucinations, Springer, The Bottom Up and Top Down Components of Hallucinatory Phenomenon,

Treatments

There are few treatments for many types of hallucinations. However, for those hallucinations caused by mental disease, a psychologist or psychiatrist should be alerted, and treatment will be based on the observations of those doctors. Antipsychotic and atypical antipsychotic medication may also be utilized to treat the illness if the symptoms are severe and cause significant distress.{{Citation needed|date=August 2011}} For other causes of hallucinations there is no factual evidence to support any one treatment is scientifically tested and proven. However, abstaining from hallucinogenic drugs, stimulant drugs, managing stress levels, living healthily, and getting plenty of sleep can help reduce the prevalence of hallucinations. In all cases of hallucinations, medical attention should be sought out and informed of one's specific symptoms.

Epidemiology

One study from as early as 1895JOURNAL, 10.1016/S0165-1781(00)00227-4, 11166087, Prevalence of hallucinations and their pathological associations in the general population, Psychiatry Research, 97, 2–3, 153–64, 2000, Ohayon, Maurice M, reported a much higher figure, with almost 39% of people reporting hallucinatory experiences, 27% of which daytime hallucinations, mostly outside the context of illness or drug use. From this survey, olfactory (smell) and gustatory (taste) hallucinations seem the most common in the general population.

See also

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References

{{reflist|30em}}

Further reading

  • Johnson FH (1978). The Anatomy of Hallucinations. Chicago: Nelson-Hall Co. {{ISBN|0-88229-155-6}}.
  • Bentall RP, Slade PD (1988). Sensory Deception: A Scientific Analysis of Hallucination''. London: Croom Helm. {{ISBN|0-7099-3961-2}}.
  • Aleman A, Larøi F (2008). Hallucinations: The Science of Idiosyncratic Perception. American Psychological Association (APA). {{ISBN|1-4338-0311-9}}.
  • Sacks O (2012). Hallucinations. New York: Alfred A. Knopf. {{ISBN|978-0307957245}}

External links

{{Cognition, perception, emotional state and behaviour symptoms and signs}}{{Authority control}}

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