Article / Updated 03-26-2016
The most common form of psychosis is schizophrenia. Psychiatrist Eugene Bleuler used the term schizophrenia in 1911 to describe people who exhibited signs of disorganized thought processes, a lack of coherence between thought and emotion, and a state of disconnection from reality. Today, the DSM-5 criteria for schizophrenia include: Delusions: A delusion is a firmly held belief that a person maintains in spite of evidence to the contrary.