PSYCHOTIC DISORDERS (Schizophrenia And Mood Disorder : Mania, Depression and Bipolar Disorders) SCHIZOPHRENIA. definition Schizophrenia is a psychotic condition that affects the normal function of the brain, causing disturbances in a person’s thinking, emotion, and function. A person with schizophrenia experiences changes in behavior, perception, and thinking that can distance them from reality. When a person loses touch with reality, he experiences psychosis. Impaired insight is a common feature of