Auditory hallucination

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Auditory hallucination
Other namesParacusia
Specialty Psychiatry

An auditory hallucination, or paracusia, [1] is a form of hallucination that involves perceiving sounds without auditory stimulus. While experiencing an auditory hallucination, the affected person hears a sound or sounds that did not come from the natural environment.

Contents

A common form of auditory hallucination involves hearing one or more voices without a speaker present, known as an auditory verbal hallucination. This may be associated with psychotic disorders, most notably schizophrenia, and this phenomenon is often used to diagnose these conditions. [2] However, individuals without any psychiatric disease whatsoever may hear voices, [3] including those under the influence of mind-altering substances, such as cannabis, cocaine, amphetamines, and PCP.

There are three main categories into which the hearing of talking voices often fall: a person hearing a voice speak one's thoughts, a person hearing one or more voices arguing, or a person hearing a voice narrating their own actions. [4] These three categories do not account for all types of auditory hallucinations.

Hallucinations of music also occur. In these, people more often hear snippets of songs that they know, or the music they hear may be original. They may occur in mentally sound people and with no known cause. [5] Other types of auditory hallucinations include exploding head syndrome and musical ear syndrome. In the latter, people will hear music playing in their mind, usually songs they are familiar with. These hallucinations can be caused by: lesions on the brain stem (often resulting from a stroke), sleep disorders such as narcolepsy, tumors, encephalitis, or abscesses. [6] This should be distinguished from the commonly experienced phenomenon of earworms, memorable music that persists in one's mind. Reports have also mentioned that it is also possible to get musical hallucinations from listening to music for long periods of time. [7] Other causes include hearing loss and epileptic activity. [8]

In the past, the cause of auditory hallucinations was attributed to cognitive suppression by way of executive function failure of the frontoparietal sulcus. Newer research has found that they coincide with the left superior temporal gyrus, suggesting that they are better attributed to speech misrepresentations. [9] It is assumed through research that the neural pathways involved in normal speech perception and production, which are lateralized to the left temporal lobe, also underlie auditory hallucinations. [9] Auditory hallucinations correspond with spontaneous neural activity of the left temporal lobe, and the subsequent primary auditory cortex. The perception of auditory hallucinations corresponds to the experience of actual external hearing, despite the absence of any sound itself. [10]

Associated with diagnoses

In 2015 a small survey [11] reported voice hearing in persons with a wide variety of DSM-5 diagnoses, including:

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, [13] but most work with non-psychotic causes of auditory hallucinations is still ongoing. [14] [15]

Schizophrenia

In people with psychosis, the premier cause of auditory hallucinations is schizophrenia, and these are known as auditory verbal hallucinations (AVHs). [16] 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. [17] [18] 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. [19] [20] This implies that functional and structural abnormalities in the brain, both of which may have a genetic component, can induce auditory hallucinations. [21]

Auditory verbal hallucinations attributed to an external source, rather than internal, are considered the defining factor for the diagnosis of schizophrenia.[ citation needed ] The voices heard are generally destructive and emotive, adding to the state of artificial reality and disorientation seen in psychotic patients. [9] 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. [22]

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. [23] 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. [24]

Not all who experience hallucinations find them to be distressing. [25] 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. [25]

Mood disorders and dementias

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. [26]

Transient causes

Auditory hallucinations have been known to manifest as a result of intense stress, sleep deprivation, and drug use. [14] 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). [27]

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. [28] 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. [29]

Pathophysiology

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

Treatments

Medication

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. [31]

Therapy

Cognitive behavioral therapy has been shown to help decrease the frequency and distressfulness of auditory hallucinations, particularly when other psychotic symptoms were presenting. [32] 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. [32] Other cognitive and behavioural therapies have been used with mixed success. [33] [34]

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. [25]

Others

Between 25% and 30% of schizophrenia patients do not respond to antipsychotic medication [35] 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). [36] Electroconvulsive therapy or ECT has been shown to reduce psychotic symptoms associated with schizophrenia, [37] 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. [38]

History

Ancient history

Presentation

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." [39] [40]

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. [40]

Treatments

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. [40] 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. [41]

Pre-modern

Presentation

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. [41]

Treatments

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. [41] 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. [41]

Society and culture

Notable cases

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. [40]

Brian Wilson, songwriter and co-founder of the Beach Boys, has schizoaffective disorder that presents itself in the form of disembodied voices. [42] 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, [43] constructing songs that were partly designed to converse with them. [44] Wilson has said of the voices: "Mostly [they're] derogatory. Some of it's cheerful. Most of it isn't." [45] To combat them, his psychiatrist advised that he "talk humorously to them", which he says has helped "a little bit". [42]

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". [46] Some cases have been described as an "auditory ransom note".

Cultural effects

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. [47] [48] [49] 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. [50]

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. [47] Further, the study found the highest rates of both auditory hallucinations and visual hallucinations in both of the West African countries, Ghana and Nigeria. [47] In the Ghana sample, n = 76, auditory hallucinations were reported by 90.8% and visual hallucinations were reported by 53.9% of participants. [47] In the Nigeria sample, n = 324, auditory hallucinations were reported by 85.4%, and visual hallucinations were reported by 50.8% of participants. [47] 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). [49] 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". [49] 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". [49] 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". [49] Another key finding that was identified in this research study is that "voice-hearing experience outside the West may be less harsh". [49] 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". [51] The participants were also people who either had worked with psychosis or schizophrenia or had experienced psychosis or schizophrenia. [51] In this study, researchers found that the participants understood these experiences labelled "psychotic" or "schizophrenic" through multiple models. [51] Taken directly from the article, the researchers wrote that there is "no one Māori way of understanding psychotic experiences". [51] 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. [51] 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:

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". [51] 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. [48] 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". [48] 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". [48] Although generally speaking hallucinations (including auditory) are strongly related to psychotic diagnoses and schizophrenia, the presence of hallucinations does not exclusively mean that someone has a psychotic or schizophrenic episode or diagnosis. [48]

Audible thoughts

General information

Audible thoughts, also called thought sonorisation, [52] 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. [53] 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, [54] however, this hallucination is not exclusively found among people with schizophrenia, but also among patients of bipolar disorder in their manic phase. [55]

Types

Patients who experience audible thoughts will hear the voice repeating their own thoughts either as or after the thought comes into their minds. [52] [53] 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". [52]

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. [53]

And the second kind in which the voice comes after the thought appears is called echo de la pensée in French, namely thought echo. [52]

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'. [53]

If categorized by patients' subjective feelings about where the voices come from, audible thoughts can be either external or internal. [52] [55] [56] Patients reporting an internal origin of the hallucination claim that the voices are coming from somewhere inside their body, mainly in their own heads, [55] 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. [52] 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. [56] 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. [55]

Phenomenology

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. [55] 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. [55] What's more, 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. [55] Some patients may develop skills to control their hallucinations to a certain extent through some kind of cognitive focusing. They can't eliminate the voices, but through cognitive focusing or suggestive behaviours (e.g. swallowing), they can control the onset and offset of their hallucination. [55]

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. [57] According to the study by Nayani and David, [55] 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. [57] Historically, experiencing hallucinations as external has been understood to indicate a more severe psychopathology, but the empirical support for such a conclusion is lacking. [58]

Pathophysiology

Studies have suggested that damage to specific brain areas may relate to the formation of audible thought. [56] [55] 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. [55] 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. [55] [59]

Research

A good amount of the research done has focused primarily on patients with schizophrenia, and beyond that drug-resistant auditory hallucinations. [25] [60]

Auditory verbal hallucinations as symptoms of disordered speech

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. [61] Interestingly, this evidence is in line with clinical insights of the classical psychiatric school (de Clérambault) [62] 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. [63]

Non-psychotic symptomatology

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. [64] These studies indicate a remarkably high percentage of children (up to 14% of the population sampled [65] ) 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.

Methods

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. [9]

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. [9]

Causes

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. [9]

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, [66] 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. [14] [65] [67]

Internalization 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. [14] [65] [67]

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.

Disruption to internalization

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. [14] [65] [67]

Re-expansion

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. [14] [65] [67]

Treatments

Psychopharmacological treatments include antipsychotic medications. Meta-analyses show that cognitive behavioral therapy [68] and metacognitive training [69] 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.

See also

Related Research Articles

Psychosis is a condition of the mind that results in difficulties determining what is real and what is not real. Symptoms may include delusions and hallucinations, among other features. Additional symptoms are incoherent speech and behavior that is inappropriate for a given situation. There may also be sleep problems, social withdrawal, lack of motivation, and difficulties carrying out daily activities. Psychosis can have serious adverse outcomes.

<span class="mw-page-title-main">Schizophrenia</span> Mental disorder with psychotic symptoms

Schizophrenia is a mental disorder characterized by reoccurring episodes of psychosis that are correlated with a general misperception of reality. Other common signs include hallucinations, delusions, disorganized thinking, social withdrawal, and flat affect. Symptoms develop gradually and typically begin during young adulthood and are never resolved. There is no objective diagnostic test; diagnosis is based on observed behavior, a psychiatric history that includes the person's reported experiences, and reports of others familiar with the person. For a diagnosis of schizophrenia, the described symptoms need to have been present for at least six months or one month. Many people with schizophrenia have other mental disorders, especially substance use disorders, depressive disorders, anxiety disorders, and obsessive–compulsive disorder.

<span class="mw-page-title-main">Hallucination</span> Perception in the absence of external stimulation that has the qualities of real perception

A hallucination is a perception in the absence of an external stimulus that has the qualities of a real perception. Hallucinations are vivid, substantial, and are perceived to be located in external objective space. Hallucination is a combination of two conscious states of brain wakefulness and REM sleep. 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 mental imagery, which does not mimic real perception, and is under voluntary control. Hallucinations also differ from "delusional perceptions", in which a correctly sensed and interpreted stimulus is given some additional significance.

Schizoaffective disorder is a mental disorder characterized by abnormal thought processes and an unstable mood. This diagnosis requires symptoms of both schizophrenia and a mood disorder: either bipolar disorder or depression. The main criterion is the presence of psychotic symptoms for at least two weeks without any mood symptoms. Schizoaffective disorder can often be misdiagnosed when the correct diagnosis may be psychotic depression, bipolar I disorder, schizophreniform disorder, or schizophrenia. This is a problem as treatment and prognosis differ greatly for most of these diagnoses.many people with schizoaffective disorder have other mental disorder such as anxiety disorder

Richard Bentall is a Professor of Clinical Psychology at the University of Sheffield in the UK.

<span class="mw-page-title-main">Thought disorder</span> Disorder of thought form, content or stream

A thought disorder (TD) is a disturbance in cognition which affects language, thought and communication. Psychiatric and psychological glossaries in 2015 and 2017 identified thought disorders as encompassing poverty of ideas, neologisms, paralogia, word salad, and delusions—all disturbances of thought content and form. Two specific terms have been suggested—content thought disorder (CTD) and formal thought disorder (FTD). CTD has been defined as a thought disturbance characterized by multiple fragmented delusions, and the term thought disorder is often used to refer to an FTD: a disruption of the form of thought. Also known as disorganized thinking, FTD results in disorganized speech and is recognized as a major feature of schizophrenia and other psychoses. Disorganized speech leads to an inference of disorganized thought. Thought disorders include derailment, pressured speech, poverty of speech, tangentiality, verbigeration, and thought blocking. One of the first known cases of thought disorders, or specifically OCD as it is known today, was in 1691. John Moore, who was a bishop, had a speech in front of Queen Mary II, about "religious melancholy."

Kurt Schneider was a German psychiatrist known largely for his writing on the diagnosis and understanding of schizophrenia, as well as personality disorders then known as psychopathic personalities.

In psychology, schizotypy is a theoretical concept that posits a continuum of personality characteristics and experiences, ranging from normal dissociative, imaginative states to extreme states of mind related to psychosis, especially schizophrenia. The continuum of personality proposed in schizotypy is in contrast to a categorical view of psychosis, wherein psychosis is considered a particular state of mind, which the person either has or does not have.

The mental status examination (MSE) is an important part of the clinical assessment process in neurological and psychiatric practice. It is a structured way of observing and describing a patient's psychological functioning at a given point in time, under the domains of appearance, attitude, behavior, mood and affect, speech, thought process, thought content, perception, cognition, insight, and judgment. There are some minor variations in the subdivision of the MSE and the sequence and names of MSE domains.

The Hearing Voices Movement (HVM) is the name used by organizations and individuals advocating the "hearing voices approach", an alternative way of understanding the experience of those people who "hear voices". In the medical professional literature, ‘voices’ are most often referred to as auditory verbal hallucinations. The movement uses the term ‘hearing voices’, which it feels is a more accurate and 'user-friendly' term.

Hearing Voices Networks, closely related to the Hearing Voices Movement, are peer-focused national organizations for people who hear voices and supporting family members, activists and mental health practitioners. Members may or may not have a psychiatric diagnosis. Networks promote an alternative approach, where voices are not necessarily seen as signs of mental illness and regard hearing voices as a meaningful and understandable, although unusual, human variation. Voices are not seen as the problem, rather it is the relationship the person has with their voices that is regarded as the main issue.

Thought broadcasting is a type of delusional condition in which the affected person believes that others can hear their inner thoughts, despite a clear lack of evidence. The person may believe that either those nearby can perceive their thoughts or that they are being transmitted via mediums such as television, radio or the internet. Different people can experience thought broadcasting in different ways. Thought broadcasting is most commonly found among people that have a psychotic disorder, specifically schizophrenia.

Thought insertion is defined by the ICD-10 as the delusion that one's thoughts are not one's own, but rather belong to someone else and have been inserted into one's mind. The person experiencing the thought insertion delusion will not necessarily know where the thought is coming from, but makes a distinction between their own thoughts and those inserted into their minds. However, patients do not experience all thoughts as inserted; only certain ones, normally following a similar content or pattern. A person with this delusional belief is convinced of the veracity of their beliefs and is unwilling to accept such diagnosis.

<span class="mw-page-title-main">Grandiose delusions</span> Subtype of delusion

Grandiose delusions (GDs), also known as delusions of grandeur or expansive delusions, are a subtype of delusion characterized by extraordinary belief that one is famous, omnipotent, wealthy, or otherwise very powerful. Grandiose delusions often have a religious, science fictional, or supernatural theme. Examples include the extraordinary belief that one is a deity or celebrity, or that one possesses extraordinary talents, accomplishments, or superpowers.

Childhood schizophrenia is similar in characteristics of schizophrenia that develops at a later age, but has an onset before the age of 13 years, and is more difficult to diagnose. Schizophrenia is characterized by positive symptoms that can include hallucinations, delusions, and disorganized speech; negative symptoms, such as blunted affect and avolition and apathy, and a number of cognitive impairments. Differential diagnosis is problematic since several other neurodevelopmental disorders, including autism spectrum disorder, language disorder, and attention deficit hyperactivity disorder, also have signs and symptoms similar to childhood-onset schizophrenia.

A religious delusion is defined as a delusion, or fixed belief not amenable to change in light of conflicting evidence, involving religious themes or subject matter. Religious faith, meanwhile, is defined as a belief in a religious doctrine or higher power in the absence of evidence. Psychologists, scientists, and philosophers have debated the distinction between the two, which is subjective and cultural.

The relationship between religion and schizophrenia is of particular interest to psychiatrists because of the similarities between religious experiences and psychotic episodes; religious experiences often involve auditory and/or visual phenomena, and those with schizophrenia commonly report hallucinations and delusions that may resemble the events found within a religious experience. In general, religion has been found to have "both a protective and a risk increasing effect" for schizophrenia.

Schizophrenia is a primary psychotic disorder, whereas, bipolar disorder is a primary mood disorder which can also involve psychosis. Both schizophrenia and bipolar disorder are characterized as critical psychiatric disorders in the Diagnostic and Statistical Manual of Mental Disorders fifth edition (DSM-5). However, because of some similar symptoms, differentiating between the two can sometimes be difficult; indeed, there is an intermediate diagnosis termed schizoaffective disorder.

Musical hallucinations describes a neurological disorder in which the patient will hallucinate songs, tunes, instruments and melodies. The source of these hallucinations are derived from underlying psychotic illness or hearing impairment. These hallucinations are often rare and are followed by mental decline. A majority of patients who have symptoms of musical hallucinations are older and have onset conditions predisposing them to the disease. While there is no set form of treatment, research has discovered medications and alternative therapies to be successful in alleviating the hallucinations.

A self-disorder, also called ipseity disturbance, is a psychological phenomenon of disruption or diminishing of a person's minimal self – the fundamental sense that one's experiences are truly one's own. People with self-disorder feel that their internal experiences are actually external; for example, they may experience their own thoughts as coming from outside themselves, whether in the form of true auditory hallucinations or merely as a vague sense that their thoughts do not belong to them.

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