auditory hallucination

In 2015 a small survey{{cite journal | vauthors = Woods A, Jones N, Alderson-Day B, Callard F, Fernyhough C | title = Experiences of hearing voices: analysis of a novel phenomenological survey | journal = The Lancet. Psychiatry | volume = 2 | issue = 4 | pages = 323–331 | date = April 2015 | pmid = 26360085 | pmc = 4580735 | doi = 10.1016/S2215-0366(15)00006-1 }} reported voice hearing in persons with a wide variety of DSM-5 diagnoses, including:

• Bipolar disorder
• Borderline personality disorder
• Depression (mixed)
• Dissociative identity disorder
• Generalized anxiety disorder
• Obsessive compulsive disorder
• Post-traumatic stress disorder
• Psychosis (NOS)
• Schizoaffective disorder
• Schizophrenia{{Cite web|url=https://nami.org/Learn-More/Mental-Health-Conditions/Schizophrenia|title=Schizophrenia|website=National Alliance on Mental Illness (NAMI)|access-date=November 20, 2019}}
• Substance-induced psychosis
• Delusional disorder (non-prominently)

However, numerous persons surveyed reported no diagnosis. In his popular 2012 book Hallucinations, neurologist Oliver Sacks describes voice hearing in patients with a wide variety of medical conditions, as well as his own personal experience of hearing voices. Genetic correlations have been identified with auditory hallucinations,{{cite journal | vauthors = Hugdahl K, Løberg EM, Specht K, Steen VM, van Wageningen H, Jørgensen HA | title = Auditory hallucinations in schizophrenia: the role of cognitive, brain structural and genetic disturbances in the left temporal lobe | journal = Frontiers in Human Neuroscience | volume = 1 | pages = 6 | year = 2008 | pmid = 18958220 | pmc = 2525988 | doi = 10.3389/neuro.09.006.2007 | doi-access = free }} but most work with non-psychotic causes of auditory hallucinations is still ongoing.{{cite journal | vauthors = Stip E, Letourneau G | title = Psychotic symptoms as a continuum between normality and pathology | journal = Canadian Journal of Psychiatry | volume = 54 | issue = 3 | pages = 140–151 | date = March 2009 | pmid = 19321018 | doi = 10.1177/070674370905400302 | doi-access = free }}

In people with psychosis, the premier cause of auditory hallucinations is schizophrenia, and these are known as auditory verbal hallucinations (AVHs).{{cite journal | vauthors = Nathou C, Etard O, Dollfus S | title = Auditory verbal hallucinations in schizophrenia: current perspectives in brain stimulation treatments | journal = Neuropsychiatric Disease and Treatment | volume = 15 | pages = 2105–2117 | date = 2019 | pmid = 31413576 | pmc = 6662171 | doi = 10.2147/NDT.S168801 | doi-access = free }} In schizophrenia, people show a consistent increase in activity of the thalamic and striatal subcortical nuclei, hypothalamus, and paralimbic regions; confirmed by PET and fMRI scans.{{cite journal | vauthors = Silbersweig DA, Stern E, Frith C, Cahill C, Holmes A, Grootoonk S, Seaward J, McKenna P, Chua SE, Schnorr L | display-authors = 6 | title = A functional neuroanatomy of hallucinations in schizophrenia | journal = Nature | volume = 378 | issue = 6553 | pages = 176–179 | date = November 1995 | pmid = 7477318 | doi = 10.1038/378176a0 | s2cid = 4340029 | bibcode = 1995Natur.378..176S }}{{cite journal | vauthors = Gaser C, Nenadic I, Volz HP, Büchel C, Sauer H | title = Neuroanatomy of "hearing voices": a frontotemporal brain structural abnormality associated with auditory hallucinations in schizophrenia | journal = Cerebral Cortex | volume = 14 | issue = 1 | pages = 91–96 | date = January 2004 | pmid = 14654460 | doi = 10.1093/cercor/bhg107 | doi-access = free }} Other research shows an enlargement of temporal white matter, frontal gray matter, and temporal gray matter volumes (those areas crucial to both inner and outer speech) when compared to control groups.{{cite journal | vauthors = Shin SE, Lee JS, Kang MH, Kim CE, Bae JN, Jung G | title = Segmented volumes of cerebrum and cerebellum in first episode schizophrenia with auditory hallucinations | journal = Psychiatry Research | volume = 138 | issue = 1 | pages = 33–42 | date = January 2005 | pmid = 15708299 | doi = 10.1016/j.pscychresns.2004.11.005 | s2cid = 39689670 }}{{cite journal | vauthors = Shergill SS, Brammer MJ, Fukuda R, Williams SC, Murray RM, McGuire PK | title = Engagement of brain areas implicated in processing inner speech in people with auditory hallucinations | journal = The British Journal of Psychiatry | volume = 182 | issue = 6 | pages = 525–531 | date = June 2003 | pmid = 12777344 | doi = 10.1192/bjp.182.6.525 | doi-access = free }} This implies that functional and structural abnormalities in the brain, both of which may have a genetic component, can induce auditory hallucinations.{{cite journal | vauthors = Boksa P | title = On the neurobiology of hallucinations | journal = Journal of Psychiatry & Neuroscience | volume = 34 | issue = 4 | pages = 260–262 | date = July 2009 | pmid = 19568476 | pmc = 2702442 }}

Auditory verbal hallucinations attributed to an external source, rather than internal, are considered the defining factor for the diagnosis of schizophrenia.{{Citation needed|date=April 2023}} The voices heard are generally destructive and emotive, adding to the state of artificial reality and disorientation seen in psychotic patients. The causal basis of hallucinations has been explored on the cellular receptor level. The glutamate hypothesis, proposed as a possible cause for schizophrenia, may also have implications in auditory hallucinations, which are suspected to be triggered by altered glutamatergic transmission.{{cite journal | vauthors = Bartha R, al-Semaan YM, Williamson PC, Drost DJ, Malla AK, Carr TJ, Densmore M, Canaran G, Neufeld RW | display-authors = 6 | title = A short echo proton magnetic resonance spectroscopy study of the left mesial-temporal lobe in first-onset schizophrenic patients | journal = Biological Psychiatry | volume = 45 | issue = 11 | pages = 1403–1411 | date = June 1999 | pmid = 10356621 | doi = 10.1016/S0006-3223(99)00007-4 | s2cid = 11674654 }}

Studies using dichotic listening methods suggest that people with schizophrenia have major deficits in the functioning of the left temporal lobe by showing that patients do not generally exhibit what is a functionally normal right ear advantage.{{cite journal | vauthors = Green MF, Hugdahl K, Mitchell S | title = Dichotic listening during auditory hallucinations in patients with schizophrenia | journal = The American Journal of Psychiatry | volume = 151 | issue = 3 | pages = 357–362 | date = March 1994 | pmid = 8109643 | doi = 10.1176/ajp.151.3.357 }} Inhibitory control of hallucinations in patients has been shown to involve failure of top-down regulation of resting-state networks and up-regulation of effort networks, further impeding normal cognitive functioning.{{cite journal | vauthors = Fox MD, Raichle ME | title = Spontaneous fluctuations in brain activity observed with functional magnetic resonance imaging | journal = Nature Reviews. Neuroscience | volume = 8 | issue = 9 | pages = 700–711 | date = September 2007 | pmid = 17704812 | doi = 10.1038/nrn2201 | s2cid = 15979590 }}

Not all who experience hallucinations find them to be distressing.{{cite journal | vauthors = Chadwick P, Birchwood M | title = The omnipotence of voices. A cognitive approach to auditory hallucinations | journal = The British Journal of Psychiatry | volume = 164 | issue = 2 | pages = 190–201 | date = February 1994 | pmid = 8173822 | doi = 10.1192/bjp.164.2.190 | s2cid = 6659161 }} The relationship between an individual and their hallucinations is personal, and everyone interacts with their troubles in different ways. There are those who hear solely malevolent voices, solely benevolent voices, those that hear a mix of the two, and those that see them as either malevolent or benevolent and not believing the voice.

Mood disorders such as bipolar disorder and major depression have also been known to correlate with auditory hallucinations, but tend to be milder than their psychosis-induced counterpart. Auditory hallucinations are a relatively common sequelae of major neurocognitive disorders (formerly dementia) such as Alzheimer's disease.{{cite journal | vauthors = Wilson RS, Gilley DW, Bennett DA, Beckett LA, Evans DA | title = Hallucinations, delusions, and cognitive decline in Alzheimer's disease | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 69 | issue = 2 | pages = 172–177 | date = August 2000 | pmid = 10896689 | pmc = 1737043 | doi = 10.1136/jnnp.69.2.172 }}

Auditory hallucinations have been known to manifest as a result of intense stress, sleep deprivation, and drug use.{{cite book | vauthors = Fernyhough C, Jones SR | chapter = Thinking aloud about mental voices | chapter-url = http://www.charlesfernyhough.com/papers/F%26JHallucn.pdf | veditors = Macpherson F, Platchias D | title = Hallucination | location = Cambridge, MA | publisher = MIT Press | isbn = 978-0-262-01920-0 | date = August 2013 | access-date = 2018-06-30 | archive-date = 2016-03-17 | archive-url = https://web.archive.org/web/20160317035437/http://www.charlesfernyhough.com/papers/F%26JHallucn.pdf | url-status = dead }} Auditory hallucinations can also occur in mentally healthy individuals during the altered state of consciousness while falling asleep (hypnagogic hallucinations) and waking up (hypnopompic hallucinations).{{cite journal | vauthors = de Leede-Smith S, Barkus E | title = A comprehensive review of auditory verbal hallucinations: lifetime prevalence, correlates and mechanisms in healthy and clinical individuals | journal = Frontiers in Human Neuroscience | volume = 7 | pages = 367 | date = 2013 | pmid = 23882203 | pmc = 3712258 | doi = 10.3389/fnhum.2013.00367 | doi-access = free }}

High caffeine consumption has been linked to an increase in the likelihood of 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 could trigger the phenomenon.{{cite web|url=http://www.medicalnewstoday.com/articles/227884.php|title=Too Much Coffee Can Make You Hear Things That Are Not There|date=8 June 2011|access-date=2 July 2016}} Intoxication of psychoactive drugs such as PCP, amphetamines, cocaine, marijuana and other substances can produce hallucinations in general, especially in high doses. Withdrawal from certain drugs such as alcohol, sedatives, hypnotics, anxiolytics, and opioids can also produce hallucinations, including auditory.

Extreme altitude Mountain climbers, especially lone ones, can experience auditory hallucinations due to a combination of hypoxia, social isolation and stress.Brugger P, Regard M, Landis T, Oelz O. Hallucinatory experiences in extreme-altitude climbers. Neuropsychiatry Neuropsychol Behav Neurol. 1999 Jan;12(1):67-71

The following areas of the brain have been found to be active during auditory hallucinations, through the use of fMRIs.

• Transverse temporal gyri (Heschl's gyri): found within the primary auditory cortex.{{cite journal | vauthors = Dierks T, Linden DE, Jandl M, Formisano E, Goebel R, Lanfermann H, Singer W | title = Activation of Heschl's gyrus during auditory hallucinations | journal = Neuron | volume = 22 | issue = 3 | pages = 615–621 | date = March 1999 | pmid = 10197540 | doi = 10.1016/S0896-6273(00)80715-1 | s2cid = 18585395 | doi-access = free }}
• Left temporal lobe: processes semantics in speech and vision, including primary auditory cortex.
• Broca's area: speech and language comprehension.
• Superior temporal gyrus: contains primary auditory cortex.
• Primary auditory cortex: processes hearing and speech perception.
• Globus pallidus: Regulation of voluntary movement.

The primary means of treating auditory hallucinations is antipsychotic medications which affect dopamine metabolism. If the primary diagnosis is a mood disorder (with psychotic features), adjunctive medications are often used (e.g., antidepressants or mood stabilizers). These medical approaches may allow the person to function normally but are not a cure as they do not eradicate the underlying thought disorder.{{cite book | vauthors = Barker P | year = 2009 | title = Psychiatric and Mental Health Nursing - The craft of caring | edition = 2nd | location = England | publisher = Hodder Arnold | isbn = 978-1-4987-5958-8 }}

Cognitive behavioral therapy has been shown to help decrease the frequency and distressfulness of auditory hallucinations, particularly when other psychotic symptoms were presenting.{{cite journal | vauthors = Penn DL, Meyer PS, Evans E, Wirth RJ, Cai K, Burchinal M | title = A randomized controlled trial of group cognitive-behavioral therapy vs. enhanced supportive therapy for auditory hallucinations | journal = Schizophrenia Research | volume = 109 | issue = 1–3 | pages = 52–59 | date = April 2009 | pmid = 19176275 | doi = 10.1016/j.schres.2008.12.009 | s2cid = 16144725 }} Enhanced supportive therapy has been shown to reduce the frequency of auditory hallucinations, the violent resistance the patient displayed towards said hallucinations, and an overall decrease in the perceived malignancy of the hallucinations. Other cognitive and behavioural therapies have been used with mixed success.{{cite journal | vauthors = Hayashi N, Igarashi Y, Suda K, Nakagawa S | title = Auditory hallucination coping techniques and their relationship to psychotic symptomatology | journal = Psychiatry and Clinical Neurosciences | volume = 61 | issue = 6 | pages = 640–645 | date = December 2007 | pmid = 18081625 | doi = 10.1111/j.1440-1819.2007.01741.x | s2cid = 24562332 | doi-access = free }}{{cite journal | vauthors = Shergill SS, Murray RM, McGuire PK | title = Auditory hallucinations: a review of psychological treatments | journal = Schizophrenia Research | volume = 32 | issue = 3 | pages = 137–150 | date = August 1998 | pmid = 9720119 | doi = 10.1016/S0920-9964(98)00052-8 | s2cid = 44717839 }}

Another key to therapy is to help patients see that they do not need to obey the voices that they are hearing. It has been seen in patients with schizophrenia and auditory hallucinations that therapy might help confer insight into recognising and choosing to not obey the voices that they hear.

Between 25% and 30% of schizophrenia patients do not respond to antipsychotic medication{{cite journal | vauthors = Rosenberg O, Roth Y, Kotler M, Zangen A, Dannon P | title = Deep transcranial magnetic stimulation for the treatment of auditory hallucinations: a preliminary open-label study | journal = Annals of General Psychiatry | volume = 10 | issue = 1 | pages = 3 | date = February 2011 | pmid = 21303566 | pmc = 3045391 | doi = 10.1186/1744-859X-10-3 | doi-access = free }} which has led researchers to look for alternate sources to help them. Two common methods to help are electroconvulsive therapy and repetitive transcranial magnetic stimulation (rTMS).{{cite journal | vauthors = Matheson SL, Green MJ, Loo C, Carr VJ | title = Quality assessment and comparison of evidence for electroconvulsive therapy and repetitive transcranial magnetic stimulation for schizophrenia: a systematic meta-review | journal = Schizophrenia Research | volume = 118 | issue = 1–3 | pages = 201–210 | date = May 2010 | pmid = 20117918 | doi = 10.1016/j.schres.2010.01.002 | s2cid = 205066500 }} Electroconvulsive therapy or ECT has been shown to reduce psychotic symptoms associated with schizophrenia,{{cite journal | vauthors = Pompili M, Lester D, Dominici G, Longo L, Marconi G, Forte A, Serafini G, Amore M, Girardi P | display-authors = 6 | title = Indications for electroconvulsive treatment in schizophrenia: a systematic review | journal = Schizophrenia Research | volume = 146 | issue = 1–3 | pages = 1–9 | date = May 2013 | pmid = 23499244 | doi = 10.1016/j.schres.2013.02.005 | hdl = 11567/691409 | s2cid = 23937445 }} mania, and depression, and is often used in psychiatric hospitals.

Transcranial magnetic stimulation when used to treat auditory hallucinations in patients with schizophrenia is done at a low frequency of 1 Hertz to the left temporoparietal cortex.{{cite journal | vauthors = Tranulis C, Sepehry AA, Galinowski A, Stip E | title = Should we treat auditory hallucinations with repetitive transcranial magnetic stimulation? A metaanalysis | journal = Canadian Journal of Psychiatry | volume = 53 | issue = 9 | pages = 577–586 | date = September 2008 | pmid = 18801220 | doi = 10.1177/070674370805300904 | doi-access = free }}

In the ancient world, auditory hallucinations were often viewed as either a gift or curse by God or the gods (depending on the specific culture). According to the Greek historian Plutarch, during the reign of Tiberius (A.D. 14–37), a sailor named Thamus heard a voice cry out to him from across the water, "Thamus, are you there? When you reach Palodes, take care to proclaim that the great god Pan is dead."Plutarch, Moralia Book 5:17, De defectu oraculorum ("The Obsolescence of Oracles").

The oracles of ancient Greece were known to experience auditory hallucinations while breathing in certain psychoactive vapors (such as the smoke from bay leaves), while the more pervasive delusions and symptomatology were often viewed as possession by demonic forces as punishment for misdeeds.

Treatment in the ancient world is ill-documented, but there are some cases of therapeutics being used to attempt treatment, while the common treatment was sacrifice and prayer in an attempt to placate the gods. During the Middle Ages, those with auditory hallucinations were sometimes subjected to trepanning or trial as a witch. In other cases of extreme symptomatology, individuals were seen as being reduced to animals by a curse; these individuals were either left on the streets or imprisoned in insane asylums. It was the latter response that eventually led to modern psychiatric hospitals.

Auditory hallucinations were rethought during the enlightenment. As a result, the predominant theory in the western world beginning in the late 18th century was that auditory hallucinations were the result of a disease in the brain (e.g., mania), and treated as such.{{cite book |chapter=Mental Health Institutions (Insane Asylums) | vauthors = Boyer PS |title=The Oxford companion to United States history |date=2001 |publisher=Oxford Univ. Press |location=Oxford |isbn=978-0-19-508209-8 |page=[https://archive.org/details/oxfordcompaniont00paul_0/page/488 488] |chapter-url-access=registration |chapter-url=https://archive.org/details/oxfordcompaniont00paul_0 |url=https://archive.org/details/oxfordcompaniont00paul_0/page/488 }}

There were no effective treatments for hallucinations at this time. Conventional thought was that clean food, water, and air would allow the body to heal itself (sanatorium). Beginning in the 16th century insane asylums were first introduced in order to remove "the mad dogs" from the streets. These asylums acted as prisons until the late 18th century. This is when doctors began the attempt to treat patients. Often attending doctors would douse patients in cold water, starve them, or spin patients on a wheel. Soon, this gave way to brain-specific treatments with the most famous examples including lobotomy, shock therapy, and branding the skull with a hot iron.

Robert Schumann, a famous music composer, spent the end of his life experiencing auditory hallucinations. One night he claimed to have been visited by the ghost of Schubert and wrote down the music that he was hearing. Thereafter, he began making claims that he could hear an angelic choir singing to him. As his condition worsened, the angelic voices developed into demonic ones.{{cite news | title=Spirited Away | vauthors = Laqueur T | date=2007-09-03 | pages=36–42 }}

Brian Wilson, songwriter and co-founder of the Beach Boys, has schizoaffective disorder that presents itself in the form of disembodied voices.{{cite web|title=Brian Wilson – A Powerful Interview|url=http://abilitymagazine.com/past/brianW/brianw.html|work=Ability Magazine}} They formed a major component of Bill Pohlad's Love & Mercy (2014), a biographical film which depicts Wilson's hallucinations as a source of musical inspiration,{{cite web|vauthors=Tapley K|title=Bill Pohlad wants 'Love & Mercy' to take you inside the genius of Beach Boy Brian Wilson|url=http://www.hitfix.com/in-contention/bill-pohlad-wants-love-mercy-to-take-you-inside-the-genius-of-beach-boy-brian-wilson|work=HitFix|date=May 21, 2015|access-date=August 1, 2015|archive-date=June 1, 2016|archive-url=https://web.archive.org/web/20160601214434/http://www.hitfix.com/in-contention/bill-pohlad-wants-love-mercy-to-take-you-inside-the-genius-of-beach-boy-brian-wilson|url-status=dead}} constructing songs that were partly designed to converse with them.{{cite web| vauthors = Powers A |title=Why Films About Musicians Leave So Much Music Off Screen|url=https://www.npr.org/sections/therecord/2015/07/07/420818746/why-films-about-musicians-leave-so-much-music-off-screen|publisher=NPR|date=July 7, 2015}} Wilson has said of the voices: "Mostly [they're] derogatory. Some of its cheerful. Most of it isn't."{{cite web| vauthors = Gilstrap P |title=Inside Brian Wilson's room: The famed Beach Boy opens up about mental illness, medication, manipulation and the movie about his life | url = http://www.salon.com/2015/06/03/inside_brian_wilsons_room_the_famed_beach_boy_opens_up_about_mental_illness_medication_manipulation_and_the_movie_about_his_life/ |work=Salon|date=June 3, 2015}} To combat them, his psychiatrist advised that he "talk humorously to them", which he says has helped "a little bit".

The onset of delusional thinking is most often described as being gradual and insidious. Patients have described an interest in psychic phenomena progressing to increasingly unusual preoccupations and then to bizarre beliefs "in which I believed wholeheartedly". One author wrote of their hallucinations: "they deceive, derange and force me into a world of crippling paranoia". In many cases, the delusional beliefs could be seen as fairly rational explanations for abnormal experiences: "I increasingly heard voices (which I'd always call 'loud thoughts')... I concluded that other people were putting these loud thoughts into my head".{{cite journal | vauthors = Stanton B |title= First-person accounts of delusions|journal= Psychiatric Bulletin |year=2000 | volume=20 |issue=9 |pages= 333–336 |doi=10.1192/pb.24.9.333 |doi-access=free }} Some cases have been described as an "auditory ransom note".

According to research on hallucinations, both with participants from the general population and people diagnosed with schizophrenia, psychosis and related mental illnesses, there is a relationship between culture and hallucinations.{{cite journal | vauthors = Bauer SM, Schanda H, Karakula H, Olajossy-Hilkesberger L, Rudaleviciene P, Okribelashvili N, Chaudhry HR, Idemudia SE, Gscheider S, Ritter K, Stompe T | display-authors = 6 | title = Culture and the prevalence of hallucinations in schizophrenia | journal = Comprehensive Psychiatry | volume = 52 | issue = 3 | pages = 319–325 | date = 2011-05-01 | pmid = 21497227 | doi = 10.1016/j.comppsych.2010.06.008 }}{{cite journal | vauthors = Beavan V, Read J, Cartwright C | title = The prevalence of voice-hearers in the general population: a literature review | journal = Journal of Mental Health | volume = 20 | issue = 3 | pages = 281–292 | date = June 2011 | pmid = 21574793 | doi = 10.3109/09638237.2011.562262 | s2cid = 207498701 }}{{cite journal | vauthors = Luhrmann TM, Padmavati R, Tharoor H, Osei A | title = Hearing Voices in Different Cultures: A Social Kindling Hypothesis | journal = Topics in Cognitive Science | volume = 7 | issue = 4 | pages = 646–663 | date = October 2015 | pmid = 26349837 | doi = 10.1111/tops.12158 | doi-access = free }} In relation to hallucinations, the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) states that "transient hallucinatory experiences may occur without a mental disorder"; put differently, short or temporary hallucinations are not exclusive to being diagnosed with a mental disorder.{{Cite book|title=Diagnostic and Statistical Manual of Mental Disorders|last=American Psychiatric Association|date=2013-05-22|publisher=American Psychiatric Association|isbn=978-0890425558|doi=10.1176/appi.books.9780890425596|hdl=2027.42/138395|citeseerx=10.1.1.988.5627|url-access=registration|url=https://archive.org/details/diagnosticstatis0005unse}}

In a study of 1,080 people with a schizophrenia diagnosis from seven countries of origin: Austria, Poland, Lithuania, Georgia, Pakistan, Nigeria and Ghana, researchers found that 74.8% of the total participants (n = 1,080) disclosed having experienced more auditory hallucinations in the last year than any other hallucinations from the date of the interview. Further, the study found the highest rates of both auditory hallucinations and visual hallucinations in both of the West African countries, Ghana and Nigeria. In the Ghana sample, n = 76, auditory hallucinations were reported by 90.8% and visual hallucinations were reported by 53.9% of participants. In the Nigeria sample, n = 324, auditory hallucinations were reported by 85.4%, and visual hallucinations were reported by 50.8% of participants. These findings are in line with other studies that have found that visual hallucinations were reported more in traditional cultures.

A 2015 published study, "Hearing Voices in Different Cultures: A Social Kindling Hypothesis" compared the experiences of three groups of 20 participants who met the criteria for schizophrenia (n = 60) from three places, including San Mateo, California (USA), Accra, Ghana (Africa), and Chennai, India (South Asia). In this study, researchers found distinct differences among the participant's experience with voices. In the San Mateo, CA sample all but three of the participants referred to their experience of hearing voices with "diagnostic labels, and even [used] diagnostic criteria readily", they also connected "hearing voices" with being "crazy". For the Accra, Ghana sample, almost no participants referenced a diagnosis and instead they spoke about voices as having "a spiritual meaning and as well as a psychiatric one". In the Chennai, India sample, similarly to the Ghana interviewees, most of the participants did not reference a diagnosis and for many of these participants, the voices they heard were of people they knew and people they were related to, "voices of kin". Another key finding that was identified in this research study is that "voice-hearing experience outside the West may be less harsh". Finally, researchers found that "different cultural expectations about the mind, or about the way people expect thoughts and feelings to be private or accessible to spirits or persons" could be attributed to the differences they found across the participants.

In a qualitative study of 57 self-identified Māori participants subcategorized within one or more of the following groups including: "tangata Māori (people seeking wellness/service users), Kaumatua/Kuia (elders), Kai mahi (cultural support workers), Managers of mental health services, clinicians (psychiatrists, nurses, and psychologists) and students (undergraduate and postgraduate psychology students)", researchers interviewed participants and asked them about "[1] their understanding of experiences that could be considered to be psychotic or labelled schizophrenic, [2] what questions they would ask someone who came seeking help and [3] they we asked about their understanding of the terms schizophrenia and psychosis".{{cite journal | vauthors = Taitimu M, Read J, McIntosh T | title = Ngā Whakāwhitinga (standing at the crossroads): How Māori understand what Western psychiatry calls "schizophrenia" | journal = Transcultural Psychiatry | volume = 55 | issue = 2 | pages = 153–177 | date = April 2018 | pmid = 29455628 | doi = 10.1177/1363461518757800 | s2cid = 3367729 | url = http://roar.uel.ac.uk/7020/1/TAITIMU%2C%20M.%20How%20Maori%20understand%20%27schizophrenia%27%20Final%20version%20-%20accepted%20manuscript.pdf }} The participants were also people who either had worked with psychosis or schizophrenia or had experienced psychosis or schizophrenia. In this study, researchers found that the participants understood these experiences labelled "psychotic" or "schizophrenic" through multiple models. Taken directly from the article, the researchers wrote that there is "no one Māori way of understanding psychotic experiences". Instead, as part of understanding these experiences, the participants combined both "biological explanations and Māori spiritual beliefs", with a preference for cultural and psychosocial explanations. For example, 19 participants spoke about psychotic experiences as sometimes being a sign of matakite (giftedness). One of the Kaumatua/Kuia (elders) was quoted as saying:{{blockquote|I never wanted to accept it, I said no it isn't, it isn't [matakite] but it wouldn't stop and in truth I knew what I had to do, help my people, I didn't want the responsibility but here I am. They helped me understand it and told me what to do with it.}}An important finding highlighted in this study is that studies done by the World Health Organization (WHO) have found that "developing countries (non-Western) experience far higher rates of recovery from 'schizophrenia' than Western countries". The researchers further articulate that these findings may be due to culturally specific meaning created about the experience of schizophrenia, psychosis, and hearing voices as well as "positive expectations around recovery".

Research has found that auditory hallucinations and hallucinations more broadly are not necessarily a symptom of "severe mental health" and instead might be more commonplace than assumed and also experienced by people in the general population. According to a literature review, "The prevalence of voice-hearers in the general population: A literature review", which compared 17 studies on auditory hallucinations in participants from nine countries, found that "differences in the prevalence of [voice-hearing in the adult general population] can be attributed to true variations based on gender, ethnicity and environmental context". The studies took place from 1894 to 2007 and the nine countries in which the studies took place were the United Kingdom, Philippines, United States, Sweden, France, Germany, Italy, Netherlands, and New Zealand. The same literature review highlighted that "studies that [analyzed] their data by gender report[ed] a higher frequency of women reporting hallucinatory experiences of some kind". Although generally speaking hallucinations (including auditory) are related to psychotic diagnoses and schizophrenia, the presence of hallucinations does not exclusively mean that someone has a psychotic or schizophrenic episode or diagnosis.

Audible thoughts, also called thought sonorisation,{{cite journal | vauthors = Kaufmann C, Agalawatta N, Masson M, Malhi GS | title = Phenomenal Insights: Extraordinary auditory hallucinations-Thought sonorisation | journal = The Australian and New Zealand Journal of Psychiatry | volume = 51 | issue = 5 | pages = 538–539 | date = May 2017 | pmid = 28415876 | doi = 10.1177/0004867417703488 | s2cid = 12954351 }} is a kind of auditory verbal hallucination. People with this hallucination constantly hear a voice narrating one's own thoughts out loud. This idea was first defined by Kurt Schneider, who included this symptom as one of the "first-rank symptoms" in diagnosing schizophrenia.{{cite journal | vauthors = Mellor CS | title = First rank symptoms of schizophrenia. I. The frequency in schizophrenics on admission to hospital. II. Differences between individual first rank symptoms | journal = The British Journal of Psychiatry | volume = 117 | issue = 536 | pages = 15–23 | date = July 1970 | pmid = 5479324 | doi = 10.1192/S0007125000192116 | s2cid = 26706017 }} Although the diagnostic reliability of "first-rank symptoms" has long been questioned, this idea remains important for its historical and descriptive value in psychiatry. Audible thoughts is a positive symptom of schizophrenia according to DSM-5,{{cite book | author = American Psychiatric Association. | date = 2013 | title = Diagnostic and statistical manual of mental disorders (DSM-5®). | publisher = American Psychiatric Publications | isbn = 9780890425572 | url = https://books.google.com/books?id=-JivBAAAQBAJ&pg=PT15 }} however, this hallucination is not exclusively found among people with schizophrenia, but also among patients of bipolar disorder in their manic phase.{{cite journal | vauthors = Nayani TH, David AS | title = The auditory hallucination: a phenomenological survey | journal = Psychological Medicine | volume = 26 | issue = 1 | pages = 177–89 | date = January 1996 | pmid = 8643757 | doi = 10.1017/s003329170003381x | s2cid = 22410079 }}

Patients who experience audible thoughts will hear the voice repeating their own thoughts either as or after the thought comes into their minds. The first kind of audible thought, the voice and the thought appear simultaneously, was named by German psychiatrist August Cramer as Gedankenlautwerden, a German word stands for "thoughts become aloud".

Example of Gedankenlautwerden:

A 35-year-old painter heard a quiet voice with an 'Oxford accent'. The volume was slightly lower than that of normal conversation and could be heard equally well with either ear. The voice would say, 'I can't stand that man, the way he holds his brush he looks like a poof.' He immediately experienced whatever the voice was saying as his own thoughts, to the exclusion of all other thoughts.

And the second kind in which the voice comes after the thought appears is called echo de la pensée in French, namely thought echo.

Example of thought echo:

A 32-year-old housewife complained of a man's voice. The voice would repeat almost all the patient's goal-directed thinking, even banalest thoughts. The patient would think 'I must put the kettle on', and after a pause of not more than one second the voice would say 'I must put the kettle on'.

If categorized by patients' subjective feelings about where the voices come from, audible thoughts can be either external or internal.{{cite journal | vauthors = Humpston CS, Broome MR | title = The spectra of soundless voices and audible thoughts: Towards an integrative model of auditory verbal hallucinations and thought insertion. | journal = Review of Philosophy and Psychology | date = September 2016 | volume = 7 | issue = 3 | pages = 611–629 | doi = 10.1007/s13164-015-0232-9 | s2cid = 143723991 }} Patients reporting an internal origin of the hallucination claim that the voices are coming from somewhere inside their body, mainly in their own heads, while those reporting an external origin feel the voice as coming from the environment. The external origins vary in the patients' description: some hear the voice in front of their ears, some attribute the ambient surrounding noise, like running water or wind, as the source. This sometimes influences patients' behaviours as they believe people around them can also hear these audible thoughts, therefore they may avoid social events and public places to prevent others from hearing their thoughts. Besides, study suggests that the locus of the voice may change as the patients' hallucinations develop. There's a trend of internalization of external perceptions, which means patients will locate the source of their hallucination from external objects to internal subjectivity over time.

According to a phenomenological study conducted by Tony Nayani and Anthony David in 1996, about half of the patients (46%) with audible thoughts claimed that the hallucination has somehow taken the place of their conscience in making decisions and judgement. They tend to follow the voice's instructions when confronting dilemmas in their daily lives. The study also suggests that a majority of the patients, both male and female, labeled the sounds they heard as male voices. However, younger patients tend to hear younger voices, which suggests that the voices in the hallucination may share age with the patients but not gender. Voices in the hallucination usually differ from the patients' own voices in accents. They reported the voices they heard as coming from different regions or social classes with them. Some patients may develop skills to control their hallucinations to a certain extent through some kind of cognitive focusing. They cannot eliminate the voices, but through cognitive focusing or suggestive behaviours (e.g. swallowing), they can control the onset and offset of their hallucination.

The exact differences between external hallucinations (those experienced as though caused by external stimuli) and internal hallucinations (experienced as occurring "in internal space") remain unclear.{{Cite book |url= |title=The Oxford handbook of phenomenological psychopathology |date=2019 |isbn=9780191841903 |veditors=Stanghellini G, Raballo A, Broome MR, Fernandez AV, Fusar-Poli P, Rosfort R |edition= |location= |pages=790–794 |oclc= |last1=Stanghellini |first1=Giovanni |publisher=Oxford University Press }} According to the study by Nayani and David, 49% of patients hear exclusively external hallucinations, while 38% experienced exclusively internal hallucinations; however, another study by Leudar et al. found that exclusively internal hallucinations were more common at 71%, with exclusively external hallucinations in only 18% of patients. Historically, experiencing hallucinations as external has been understood to indicate a more severe psychopathology, but the empirical support for such a conclusion is lacking.{{Cite journal |last1=Docherty |first1=Nancy M. |last2=Dinzeo |first2=Thomas J. |last3=McCleery |first3=Amanda |last4=Bell |first4=Emily K. |last5=Shakeel |first5=Mohammed K. |last6=Moe |first6=Aubrey |date=2015-05-04 |title=Internal versus external auditory hallucinations in schizophrenia: symptom and course correlates |journal=Cognitive Neuropsychiatry |language=en |volume=20 |issue=3 |pages=187–197 |doi=10.1080/13546805.2014.991387 |issn=1354-6805 |pmc=4372463 |pmid=25530157}}

Studies have suggested that damage to specific brain areas may relate to the formation of audible thought. Patients who attribute the hallucination to an external locus are more likely to report the voice coming from the right. This unilateral characteristic can be explained by either contralateral temporal lobe disease or ipsilateral ear disease. Researchers also came up with hypotheses that audible thought may result from damage in the right hemisphere, which causes the malfunction of prosodic construction. If this happens, the left hemisphere may misinterpret the patients' own thoughts as alien, leading the patients to misconceive their thoughts as coming from another voice.{{cite book | vauthors = Cutting J | date = 1990 | title = The right cerebral hemisphere and psychiatric disorders. | publisher = Oxford University Press | url = https://psycnet.apa.org/record/1990-99019-000 }}

A good amount of the research done has focused primarily on patients with schizophrenia, and beyond that drug-resistant auditory hallucinations.{{cite journal | vauthors = Waters F, Woodward T, Allen P, Aleman A, Sommer I | title = Self-recognition deficits in schizophrenia patients with auditory hallucinations: a meta-analysis of the literature | journal = Schizophrenia Bulletin | volume = 38 | issue = 4 | pages = 741–750 | date = June 2012 | pmid = 21147895 | pmc = 3406529 | doi = 10.1093/schbul/sbq144 }}

There is now substantial evidence that auditory verbal hallucinations (AVHs) in psychotic patients are manifestations of disorganized speech capacity at least as much as, and even more than, being genuinely auditory phenomena. Such evidence comes mainly from research carried out on the neuroimaging of AVHs, on the so-called "inner" and "subvocal" speech, on "voices" experienced by deaf patients, and on the phenomenology of AVHs.{{cite journal | vauthors = Mitropoulos GB | title = Auditory Verbal Hallucinations in Psychosis: Abnormal Perceptions or Symptoms of Disordered Thought? | journal = The Journal of Nervous and Mental Disease | volume = 208 | issue = 1 | pages = 81–84 | date = January 2020 | pmid = 31834193 | doi = 10.1097/NMD.0000000000001089 | s2cid = 209343186 }} Interestingly, this evidence is in line with clinical insights of the classical psychiatric school (de Clérambault){{cite book | vauthors = de Clérambault G | date = 1942 | title = OEvre Psychiatrique. | volume = II | pages = 610–612 | location = Paris | publisher = Presses Universitaires de France }} as well as of (Lacanian) psychoanalysis. According to the latter, the experience of the voice is linked more to speech as a chain of articulated signifying elements than to sensorium itself.{{cite book | vauthors = Lacan J | date = 2006 | title = Écrits: The first complete edition in English. | location = New York | publisher = Norton | page = 447 }}

There is on-going research that supports the prevalence of auditory hallucinations, with a lack of other conventional psychotic symptoms (such as delusions, or paranoia), particularly in pre-pubertal children.{{cite journal | vauthors = Askenazy FL, Lestideau K, Meynadier A, Dor E, Myquel M, Lecrubier Y | title = Auditory hallucinations in pre-pubertal children. A one-year follow-up, preliminary findings | journal = European Child & Adolescent Psychiatry | volume = 16 | issue = 6 | pages = 411–415 | date = September 2007 | pmid = 17468968 | doi = 10.1007/s00787-006-0577-9 | s2cid = 6079543 }} These studies indicate a remarkably high percentage of children (up to 14% of the population sampled{{cite journal | vauthors = Jones SR, Fernyhough C | title = Neural correlates of inner speech and auditory verbal hallucinations: a critical review and theoretical integration | journal = Clinical Psychology Review | volume = 27 | issue = 2 | pages = 140–154 | date = March 2007 | pmid = 17123676 | doi = 10.1016/j.cpr.2006.10.001 }}) experienced sounds or voices without any external cause, although "sounds" are not considered by psychiatrists to be examples of auditory hallucinations. Differentiating actual auditory hallucinations from "sounds" or a normal internal dialogue is important since the latter phenomena are not indicative of mental illness.{{Cite web |last=Liester |first=Mitchell |title=When Hearing Voices Is Not a Symptom of Mental Illness {{!}} Psychology Today |url=https://www.psychologytoday.com/us/blog/the-leading-edge/202404/when-hearing-voices-is-not-a-symptom-of-mental-illness |access-date=2025-05-26 |website=www.psychologytoday.com |language=en-US}}

To explore the auditory hallucinations in schizophrenia, experimental neurocognitive use approaches such as dichotic listening, structural fMRI, and functional fMRI. Together, they allow insight into how the brain reacts to auditory stimuli, be they external or internal. Such methods allowed researchers to find a correlation between a decreased gray matter of the left temporal lobe and difficulties in processing external sound stimuli in hallucinating patients.

Functional neuroimaging has shown increased blood and oxygen flow to speech-related areas of the left temporal lobe, including Broca's area and the thalamus.

The causes of auditory hallucinations are unclear.

It is suspected that deficits in the left temporal lobe attribute that lead to spontaneous neural activity cause speech misrepresentations that account for auditory hallucinations.

Charles Fernyhough, of the University of Durham, poses one theory among many but stands as a reasonable example of the literature. Given standing evidence towards the involvement of the inner voice in auditory hallucinations,{{cite journal | vauthors = Allen P, Aleman A, McGuire PK | title = Inner speech models of auditory verbal hallucinations: evidence from behavioural and neuroimaging studies | journal = International Review of Psychiatry | volume = 19 | issue = 4 | pages = 407–415 | date = August 2007 | pmid = 17671873 | doi = 10.1080/09540260701486498 | s2cid = 36150316 }} he proposes two alternative hypotheses on the origins of auditory hallucinations in the non-psychotic. They both rely on an understanding of the internalization process of the inner voice.

The internalization process of the inner voice is the process of creating an inner voice during early childhood and can be separated into four distinct levels.

Level one (external dialogue) involves the capacity to maintain an external dialogue with another person, i.e. a toddler talking with their parent(s).

Level two (private speech) involves the capacity to maintain a private external dialogue, as seen in children voicing the actions of play using dolls or other toys, or someone talking to themselves while repeating something they had written down.

Level three (expanded inner speech) is the first internal level in speech. This involves the capacity to carry out internal monologues, as seen in reading to oneself or going over a list silently.

Level four (condensed inner speech) is the final level in the internalization process. It involves the capacity to think in terms of pure meaning without the need to put thoughts into words in order to grasp the meaning of the thought.

A disruption could occur during the normal process of internalizing one's inner voice, where the individual would not interpret their own voice as belonging to them; a problem that would be interpreted as a level one to level four error.{{cite journal | doi = 10.1016/j.newideapsych.2004.09.001 | vauthors = Fernyhough C | title = Alien voices and inner dialogue: towards a developmental account of auditory verbal hallucinations | journal = New Ideas in Psychology | volume = 22 | year = 2004 | pages = 49–68 }}

Alternatively, the disruption could occur during the process of re-externalizing one's inner voice, resulting in an apparent second voice that seems alien to the individual; a problem that would be interpreted as a level four to level one error.

Psychopharmacological treatments include antipsychotic medications. Meta-analyses show that cognitive behavioral therapy{{cite journal | vauthors = Turner DT, Burger S, Smit F, Valmaggia LR, van der Gaag M | title = What Constitutes Sufficient Evidence for Case Formulation-Driven CBT for Psychosis? Cumulative Meta-analysis of the Effect on Hallucinations and Delusions | journal = Schizophrenia Bulletin | volume = 46 | issue = 5 | pages = 1072–1085 | date = March 2020 | pmid = 32221536 | pmc = 7505201 | doi = 10.1093/schbul/sbaa045 }} and metacognitive training{{cite journal | vauthors = Penney D, Sauvé G, Mendelson D, Thibaudeau É, Moritz S, Lepage M | title = Immediate and Sustained Outcomes and Moderators Associated With Metacognitive Training for Psychosis: A Systematic Review and Meta-analysis | journal = JAMA Psychiatry | date = March 2022 | volume = 79 | issue = 5 | pages = 417–429 | pmid = 35320347 | pmc = 8943641 | doi = 10.1001/jamapsychiatry.2022.0277 }} also reduce the severity of hallucinations. Psychology research shows that the first step in treatment is for the patient to realize that the voices they hear are a creation of their own mind. This realization allows patients to reclaim a measure of control over their lives.

• Auditory imagery
• Earworm
• Hearing Voices Network
• Hypnagogic hallucinations
• Intrusive thought
• Speech synthesis
• Tinnitus

{{Reflist}}

• {{cite book | vauthors = Johnson FH |title=The anatomy of hallucinations |publisher=Nelson-Hall Co |location=Chicago |year=1978 |isbn=978-0-88229-155-0 }}
• {{cite book | vauthors = Bentall RP, Slade PD |title=Sensory deception: a scientific analysis of hallucination |publisher=Croom Helm |location=London |year=1988 |isbn=978-0-7099-3961-0 }}
• {{cite book |vauthors=Larøi F, Aleman A |title=Hallucinations: The Science of Idiosyncratic Perception |publisher=American Psychological Association (APA) |year=2008 |isbn=978-1-4338-0311-6 |url=http://books.apa.org/books.cfm?id=4318044 |access-date=2009-10-27 |archive-url=https://web.archive.org/web/20081221152250/http://books.apa.org/books.cfm?id=4318044 |archive-date=2008-12-21 |url-status=dead }}

• [http://www.psychanalyse-paris.com/843-Anthropology-and.html "Anthropology and Hallucinations"] {{Webarchive|url=https://web.archive.org/web/20160529110305/http://psychanalyse-paris.com/843-Anthropology-and.html |date=2016-05-29 }}, chapter from The Making of Religion
• [https://web.archive.org/web/20160227012332/http://www.mind.org.uk/help/medical_and_alternative_care/the_voice_inside_coping_with_hearing_voices "The voice inside: A practical guide to coping with hearing voices"]
• [http://bjp.rcpsych.org/content/194/2/101.long A salience dysregulation syndrome], from Jim van Os. The British Journal of Psychiatry, 2009.

{{Medical resources

| DiseasesDB =

| ICD10 = {{ICD10|R|44|0|r|40}}

| ICD9 = {{ICD9|780.1}}

| ICDO =

| OMIM =

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{{Bipolar disorder}}

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

{{DEFAULTSORT:Auditory Hallucination}}

Category:Hallucinations

Category:Effects of psychoactive drugs

Category:Psychosis

Category:Medical signs

Category:Symptoms and signs of mental disorders