Psychosis
In 1841, Karl Friedrich Canstatt introduced the word psychosis into psychiatric literature as a shorthand for psychic neurosis. This term described what was then considered a psychological manifestation of brain disease rather than a specific mental illness. Today, clinicians define psychosis as the inability to distinguish what is or is not real. Common symptoms include delusions, hallucinations, and disorganized thoughts or speech. These features describe a person's state rather than a particular diagnosis like schizophrenia. Psychosis differs significantly from psychopathy, which involves impaired empathy and remorse alongside bold, disinhibited traits. A person experiencing psychosis may hear voices that seem real to them while others do not. They might believe they are being followed by enemies when no such threat exists. These experiences can be vivid and uncontrollable, often causing significant distress.
Childhood trauma has been shown to predict adolescent and adult psychosis with three times higher likelihood compared to the general population. Severe sleep deprivation can induce psychotic episodes within minutes inside an empty room devoid of light and sound. Approximately 3% of people with alcoholism experience psychosis during acute intoxication or withdrawal phases. Cannabis use before age 15 increases the risk of developing psychosis in adulthood according to current studies. Methamphetamine induces psychosis in 26% to 46% of heavy users, sometimes persisting for over six months. Various medications including corticosteroids and certain anticonvulsants can provoke psychotic symptoms upon administration or withdrawal. Medical conditions ranging from thyroid disorders to brain tumors also precipitate secondary psychosis. The relationship between traumatic life events and psychotic symptoms appears dose-dependent, meaning multiple traumas compound symptom expression and severity.
The first brain image of an individual with psychosis was completed as far back as 1935 using pneumoencephalography. This painful procedure involved draining cerebrospinal fluid around the brain and replacing it with air to visualize structure on X-rays. Modern neuroimaging shows reductions in grey matter volume affecting regions like the right middle temporal gyrus and left anterior cingulate cortex. Dopamine receptor D2 blocking drugs tend to reduce the intensity of psychotic symptoms, supporting the dopamine hypothesis. However, psychosis commonly occurs in Parkinson's disease which involves reduced rather than increased dopaminergic activity. NMDA receptor dysfunction has been proposed as a mechanism where dissociative antagonists induce a psychotic state mimicking schizophrenia symptoms. Studies during acute hallucinations demonstrate increased activity in primary sensory cortices, particularly the left superior temporal gyrus. Abnormal activation and reduced volume are seen in people with delusions within the right lateral prefrontal cortex region.
In Accra, Ghana, subjects describe voices they hear as having spiritual meaning and often report them as positive experiences. People in Chennai, India describe their hallucinations as kin, family members or close friends offering guidance. Muslim majority countries believe mental disorders such as psychosis are caused by jinn or spirits. In Cambodia, hallucinations are linked with spirit visitation, a term locals call cultural kindling. Countries like the United States predominantly use biomedical understanding where subjects report violent content and self-describe as crazy. These differences stem from social kindling how one's social context shapes interpretation of sensations. Cross-cultural studies show individual experiences vary significantly across cultures, countries and religions. Some individuals find healing or uplifting qualities in their psychotic experiences despite overwhelming negative narratives. Cultural perceptions influence whether those acting differently are viewed as abnormal or possessing special insight.
To make a diagnosis, clinicians must exclude other potential causes through comprehensive history and physical examination. Blood tests measure thyroid-stimulating hormone to rule out hypo- or hyperthyroidism and vitamin B12 serum levels for pernicious anemia. The Brief Psychiatric Rating Scale assesses 18 symptom constructs including hostility, suspicion, and grandiosity based on clinician interviews. The Positive and Negative Syndrome Scale contains 30 items used during initial assessment and follow-up periods. The Psychosis Screening Questionnaire includes five root questions assessing mania, thought insertion, paranoia, strange experiences and perceptual disturbances. Common mistakes include not properly excluding delirium or missing toxic psychosis by failing to screen for substances. A person experiencing psychosis is referred to as psychotic until relevant known causes are excluded. Family members often provide crucial information about dietary supplements the patient may be taking that cannot be ruled out with standard laboratory tests.
The first clinical trial of antipsychotics took place in 1952 when chlorpromazine passed trials becoming the first approved medication. This drug marked the advent of dopamine antagonists though side effects included irreversible Parkinsonian symptoms like tardive dyskinesia. In 1888 Swiss psychiatrist Gottlieb Burckhardt performed the first medically sanctioned psychosurgery excising cerebral cortex tissue. Between late 1930s and early 1970s leucotomy was widely accepted practice often performed in non-sterile environments. Hippocrates proposed bloodletting as surgical intervention for psychosis caused by excess blood and yellow bile according to humoralism theory. Early 20th-century treatments emphasized shocking the nervous system through insulin shock therapy and electroconvective therapy. Psychosurgery remained standard until discovery of antipsychotic pharmacology in the 1950s changed treatment paradigms completely. Atypical antipsychotics now offer comparable response rates with lower risk of Parkinsonian symptoms but higher cardiovascular disease risks.
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Common questions
When was the word psychosis introduced into psychiatric literature?
Karl Friedrich Canstatt introduced the word psychosis into psychiatric literature in 1841 as a shorthand for psychic neurosis. This term described what was then considered a psychological manifestation of brain disease rather than a specific mental illness.
What are common symptoms and causes of psychosis according to current studies?
Common symptoms include delusions, hallucinations, and disorganized thoughts or speech that describe a person's state rather than a particular diagnosis like schizophrenia. Causes range from childhood trauma which predicts adolescent and adult psychosis with three times higher likelihood to severe sleep deprivation inducing episodes within minutes inside an empty room devoid of light and sound.
How do cultural perceptions influence the experience of psychosis across different countries?
In Accra Ghana subjects describe voices they hear as having spiritual meaning and often report them as positive experiences while people in Chennai India describe their hallucinations as kin family members or close friends offering guidance. Muslim majority countries believe mental disorders such as psychosis are caused by jinn or spirits whereas countries like the United States predominantly use biomedical understanding where subjects report violent content and self-describe as crazy.
Which medical tests and scales are used to diagnose psychosis?
Blood tests measure thyroid-stimulating hormone to rule out hypo- or hyperthyroidism and vitamin B12 serum levels for pernicious anemia. The Brief Psychiatric Rating Scale assesses 18 symptom constructs including hostility suspicion and grandiosity based on clinician interviews while the Positive and Negative Syndrome Scale contains 30 items used during initial assessment and follow-up periods.
When did the first clinical trial of antipsychotics take place and what was the outcome?
The first clinical trial of antipsychotics took place in 1952 when chlorpromazine passed trials becoming the first approved medication. This drug marked the advent of dopamine antagonists though side effects included irreversible Parkinsonian symptoms like tardive dyskinesia.