Related to psychosis. Schizophrenia is a

Basic symptoms of schizophrenia are subjective symptoms, described as experienced from a person's perspective, which show evidence of underlying psychopathology. Basic symptoms have generally been applied to the assessment of people who may be at risk to develop psychosis. Though basic symptoms are often disturbing for the person, problems generally do not become evident to others until the person is no longer able to cope with their basic symptoms. Basic symptoms are more specific to identifying people who exhibit signs of prodromal psychosis (prodrome) and are more likely to develop schizophrenia over other disorders related to psychosis. Schizophrenia is a psychotic disorder, but is not synonymous with psychosis. In the prodrome to psychosis, uncharacteristic basic symptoms develop first, followed by more characteristic basic symptoms and brief and self-limited psychotic-like symptoms, and finally the onset of psychosis. People who were assessed to be high risk according to the basic symptoms criteria have a 48.5% likelihood of progressing to psychosis. In 2015, the European Psychiatric Association issued guidance recommending the use of a subscale of basic symptoms, called the Cognitive Disturbances scale (COGDIS), in the assessment of psychosis risk in help-seeking psychiatric patients; in a meta-analysis, COGDIS was shown to be as predictive of transition to psychosis as the Ultra High Risk (UHR) criteria up to 2 years after assessment, and significantly more predictive thereafter. The basic symptoms measured by COGDIS, as well as those measured by another subscale, the Cognitive-Perceptive basic symptoms scale (COPER), are predictive of transition to schizophrenia.