John Wilkes Booth was the son of prominent, wealthy actors. He, too, became an actor and was so popular, he was one of the first to have his clothes ripped off by fans. Hulton Archive/Getty hide caption
Psychology is the systematic investigation of the human mind, including behavior and cognition. It thus encompasses both normal and abnormal behavior. On the other hand, psychiatry is a branch of medicine dealing with mental illness.
1 Psychological testing can also be used to further explore the symptoms of schizophrenia. 2  These tests can include cognitive testing, personality testing, and open-ended or projective testing such as the Rorschach (inkblot) test. Generally, laboratory results and imaging studies available to most doctors are normal in schizophrenia. 2  If the person has a particular behavior as part of a mental disorder, such as drinking too much water, then this might show as a metabolic abnormality in the person's laboratory results.