Researchers have identified a new cluster of preclinical symptoms that may indicate when a young person is at greater risk for developing a psychotic illness, including schizophrenia.

The researchers also identified several biological processes that typically occur during a person’s transition from minor symptoms to clinical psychosis.

Schizophrenia and other types of psychotic illnesses typically begin around 21 years of age, with early warning signs, known as a prodromal syndrome, beginning around age 17, on average. About 30 to 40 percent of young people who meet current criteria for a prodromal syndrome will develop schizophrenia or another psychotic disorder.

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