Psychosis is a generic psychiatric term for mental states in which the components of rational thought and perception are severely impaired. Persons experiencing a psychosis may experience hallucinations, hold delusional beliefs (e.g. paranoid delusions), demonstrate personality changes and exhibit disorganized thinking (see thought disorder). This is often accompanied by lack of insight into the unusual or bizarre nature of such behavior, difficulties with social interaction and impairments in carrying out the activities of daily livi ...

Including:

Psychosis - Overview Psychosis - Psychotic experience
Psychosis - Hallucinations Psychosis - Delusions and paranoia Psychosis - Thought disorder Psychosis - Lack of insight
Psychosis - Medical understanding of psychosis
Psychosis - Psychosis and brain function Psychosis - Cannabis and psychosis Psychosis - Non-psychiatric conditions and psychosis

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Psychosis, Psychosis - Overview, Psychosis - Psychotic experience, Psychosis - Hallucinations, Psychosis - Delusions and paranoia, Psychosis - Thought disorder, Psychosis - Lack of insight, Psychosis - Medical understanding of psychosis, Psychosis - Psychosis and brain function, Psychosis - Cannabis and psychosis, Psychosis - Non-psychiatric conditions and psychosis

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There are a number of possible causes for psychosis. Psychosis may be the result of an underlying mental illness such as bipolar disorder (also known as manic depression) or schizophrenia. Psychosis may also be triggered or exacerbated by severe mental stress and high doses or chronic use of drugs such as amphetamines, LSD, PCP, cocaine or scopolamine. However, incidence of psychosis resulting from a single administration of any drug is rare, although cases have been reported in the medical literature suggesting a person's sensitivities to n ...

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Psychosis, Psychosis - Overview, Psychosis - Psychotic experience, Psychosis - Hallucinations, Psychosis - Delusions and paranoia, Psychosis - Thought disorder, Psychosis - Lack of insight, Psychosis - Medical understanding of psychosis, Psychosis - Psychosis and brain function, Psychosis - Cannabis and psychosis, Psychosis - Non-psychiatric conditions and psychosis

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A hallucination is a sensory perception experienced in the absence of an external stimulus, as distinct from an illusion, which is a misperception of an external stimulus. Hallucinations may occur in any sensory modality - visual, auditory, olfactory, gustatory, tactile, or mixed. Hallucination - Origins of the word. The word 'hallucinatory' has its roots in the Latin hallucinere or allucinere, meaning 'to wander in mind'. Altenatively in the Greek Including:

Hallucination - Origins of the word Hallucination - Possible causes

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Schizophrenia is a severe mental illness characterized by persistent defects in the perception or expression of reality. A person experiencing untreated schizophrenia typically demonstrates grossly disorganized thinking, and may also experience delusions or auditory hallucinations. Although the illness primarily affects cognition, it can also contribute to chronic problems with behavior or emotions. Due to the many possible combinations of symptoms, it is difficult to say whether it is in fact a single psychiatric disorder; and Eugen Bleuler deliberately called the disease "the schizo ...

Including:

Schizophrenia - Overview Schizophrenia - History Schizophrenia - Diagnosis
Schizophrenia - Criteria signs and symptoms Schizophrenia - Subtypes Schizophrenia - Presentation Schizophrenia - Diagnostic issues and controversies
Schizophrenia - Causes
Schizophrenia - Genetic and environmental influences Schizophrenia - Neurobiological influences
Schizophrenia - Incidence and prevalence Schizophrenia - Treatment
Schizophrenia - Medication and hospitalization Schizophrenia - Therapy and community support
Schizophrenia - Prognosis Schizophrenia - Schizophrenia and drug use
Schizophrenia - Hallucinogens Schizophrenia - Cannabis Schizophrenia - Tobacco
Schizophrenia - Schizophrenia and violence
Schizophrenia - Violence perpetrated by people with schizophrenia Schizophrenia - Violence against people with schizophrenia
Schizophrenia - Alternative approaches to schizophrenia Schizophrenia - Notable people affected by schizophrenia Schizophrenia - General reading

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Florid hallucinations are usually associated with drug use (particularly hallucinogenic drugs), sleep deprivation, psychosis or neurological illness. However, studies have shown that hallucinatory experiences take place across the population as a whole. Previous studies, one as early as 1894[1], have reported that approximately 10% of the population experience hallucinations. A recent survey of over 13,000 people^{See also:}

Hallucination, Hallucination - Origins of the word, Hallucination - Possible causes

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Schizophrenia is often described in terms of "positive" and "negative" symptoms. Positive symptoms include delusions, auditory hallucinations and thought disorder and are typically regarded as manifestations of psychosis. Negative symptoms are so named because they are considered to be the loss or absence of normal traits or abilities, and include features such as flat, blunted or constricted affect and emotion, poverty of speech and lack of motivation. Some models of schizophrenia include formal thought disorder and planning difficulties in a ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

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Amphetamine psychosis can include delusions, hallucinations and thought disorder. This is thought to be largely due to the increase in dopamine activity in the mesolimbic pathway of the brain caused by amphetamine-like drugs, although other factors such as chronic sleep deprivation may also play a part. The link between amphetamine and psychosis is one of the major sources of evidence for the dopamine hypothesis of psychosis. The link between amphetamine and psychosis was first made by Young and Scoville in 19381 and was or ...

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Amphetamine psychosis, Amphetamine psychosis - Overview

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Although aiming to reflect some of the features present in diagnosable mental illness, schizotypy does not necessarily imply that someone who is more schizotypal than someone else is more ill. For example, certain aspects of schizotypy may be beneficial. Both the Unusual experiences and Cognitive disorganisation aspects have been linked to creativity and academic achievement (e.g. research by Nettle, 2005). However, the exact nature of the relationship between schizotypy and diagnosable psychotic illness is still controv ...

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Schizotypy, Schizotypy - Development of the concept, Schizotypy - The relationship between schizotypy and mental illness, Schizotypy - Dimensional approach, Schizotypy - Quasi-dimensional approach

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The categorical view of psychosis is most associated with Emil Kraepelin, who created criteria for the medical diagnosis and classification of different forms of psychotic illness. Particularly, he made the distinction between dementia praecox (now called schizophrenia), manic depressive insanity and non-psychotic states. Modern diagnostic systems used in psychiatry (such as the DSM) maintain this categorical view. In contrast, psychiatrist Eugene Bleuler did not believe there was a clear separation between sanity and madness, and that psychosis was simply an extreme expression of thoughts and behaviours that co ...

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Schizotypy, Schizotypy - Development of the concept, Schizotypy - The relationship between schizotypy and mental illness, Schizotypy - Dimensional approach, Schizotypy - Quasi-dimensional approach

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Affected individuals report a delusional belief that they have transformed, or are in the process of transforming into another animal. It has been linked with the altered states of mind that accompany psychosis (the reality-bending mental state that typically involves delusions and hallucinations) with the transformation only seeming to happen in the mind and behaviour of the affected person. A study1 on lycanthropy from the McLean Hospital reported on a series of cases and proposed some diagnostic criteria by which lycanth ...

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Clinical lycanthropy, Clinical lycanthropy - Symptoms, Clinical lycanthropy - Proposed mechanisms, Clinical lycanthropy - Neurological factors, Clinical lycanthropy - Cultural contributions

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The symptoms can be roughly divided into convulsive symptoms and gangreneous symptoms. Ergotism - Convulsive symptoms. Convulsive symptoms include diarrhea, paresthesias, itching, seizures, headaches, nausea and vomiting. Usually the gastrointestinal effects precede CNS effects. As well as seizures there can be hallucinations and mental effects including mania or psychosis. The convulsive symptoms are caused by clavine alkaloids. E ...

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Ergotism, Ergotism - Causes, Ergotism - Symptoms, Ergotism - Convulsive symptoms, Ergotism - Gangrenous symptoms, Ergotism - History

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Accounts that may relate to symptoms of schizophrenia date back as far as 2000 BC in the Book of Hearts, part of the ancient Ebers papyrus. However, a recent study1 into the ancient Greek and Roman literature showed that, while the general population probably had an awareness of psychotic disorders, there was no recorded condition that would meet the modern diagnostic crite ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

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Schizophrenia - Criteria signs and symptoms. Like many mental illnesses, the diagnosis of schizophrenia is based upon the behavior of the person being assessed. There is a list of criteria that must be met for someone to be so diagnosed. These depend on both the presence and duration of certain signs and symptoms. The most commonly used criteria for diagnosing schizophrenia are from the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM) and the World Health Organ ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

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Schizophrenia - Genetic and environmental influences. While the reliability of the schizophrenia diagnosis introduces difficulties in measuring the relative effect of genes and environment (for example, symptoms overlap to some extent with severe bipolar disorder or major depression), there is evidence to suggest that genetic vulnerability and environmental stressors can ac ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

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Schizophrenia is typically diagnosed in late adolescence or early adulthood. It is found approximately equally in men and women, though the onset tends to be later in women, who also tend to have a better course and outcome. The lifetime prevalence of schizophrenia is commonly given at 1%; however, a recent review of studies from around the world estimated it to be 0.55%34. The same study also found that prevalence may vary greatly from country to country, despite the received ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

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Schizophrenia - Medication and hospitalization. The first line treatment for schizophrenia is usually the use of antipsychotic medication. The newer atypical antipsychotic medications (such as clozapine, risperidone, olanzapine, quetiapine, ziprasidone and aripiprazole) are preferred over older typical antipsychotic medications (such as chlorpromazine and haloperidol) due to their favorable side-effect profile. Compared to the typical antipsychotics, the atypicals are associated with a lower incident rate of extr ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

Read more here: » Schizophrenia: Encyclopedia II - Schizophrenia - Treatment

Prognosis for any particular individual affected by schizophrenia is particularly hard to judge as treatment and access to treatment is continually changing, as new methods become available and medical recommendations change. A retrospective study has shown that about a third of people make a full recovery, about a third show improvement but not a full recovery, and a third remain illSee also:

Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

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The relationship between schizophrenia and drug use is complex, meaning that a clear causal connection between drug use and schizophrenia has been difficult to tease apart. There is strong evidence that using certain drugs can trigger either the onset or relapse of schizophrenia in some people. It may also be the case, however, that people with schizophrenia use drugs to overcome negative feelings associated with the commonly prescribed antipsychotic medication, and the disorder itself, where negative emotion, paranoia and anhedonia are all considered to be core features. ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

Read more here: » Schizophrenia: Encyclopedia II - Schizophrenia - Schizophrenia and drug use

Schizophrenia - Violence perpetrated by people with schizophrenia. Although schizophrenia is sometimes associated with violence in the media, only a small minority of people with schizophrenia become violent, and only a minority of people who commit criminal violence have been diagnosed with schizophrenia. Research has suggested that schizophrenia is associated with a slight increase in risk of violence, although this risk is largely due to a small sub-group of individuals for whom violence is associated w ...

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Schizophrenia, Schizophrenia - Overview, Schizophrenia - History, Schizophrenia - Diagnosis, Schizophrenia - Criteria signs and symptoms, Schizophrenia - Subtypes, Schizophrenia - Presentation, Schizophrenia - Diagnostic issues and controversies, Schizophrenia - Causes, Schizophrenia - Genetic and environmental influences, Schizophrenia - Neurobiological influences, Schizophrenia - Incidence and prevalence, Schizophrenia - Treatment, Schizophrenia - Medication and hospitalization, Schizophrenia - Therapy and community support, Schizophrenia - Prognosis, Schizophrenia - Schizophrenia and drug use, Schizophrenia - Hallucinogens, Schizophrenia - Cannabis, Schizophrenia - Tobacco, Schizophrenia - Schizophrenia and violence, Schizophrenia - Violence perpetrated by people with schizophrenia, Schizophrenia - Violence against people with schizophrenia, Schizophrenia - Alternative approaches to schizophrenia, Schizophrenia - Notable people affected by schizophrenia, Schizophrenia - General reading

Read more here: » Schizophrenia: Encyclopedia II - Schizophrenia - Schizophrenia and violence