Schizophrenia is a psychiatric disorder that is a persistent, usually chronic, major mental illness, the most severe form of psychosis, characterized by a fragmentation of the basic personality, thinking, emotions, and behavior, and a dissonance between mental activity and the environment. The main sign of schizophrenia is thought to be the fragmentation of basic thinking structures and cognition. This dissociation is believed to result in impaired thought forms and the inability to distinguish between internal and external experiences. Individuals with schizophrenia may express hallucinations themselves, or their performance may be noticed by bystanders as being influenced by hallucinations. Patients may also express apparently delusional beliefs. Early symptoms Specific premorbid personality traits such as withdrawal, sensitivity, shyness, fantasy, and poor logical thinking lead to schizophrenia in 50% to 60% of people with schizophrenia. Analysis of domestic data found that 40% of premorbid personalities were timid, hesitant, poorly motivated, and dependent. This is 7 times higher than the control group.