Schizophrenia is a severe mental disorder which usually starts in adolescence or early adult life and often has a chronic disabling course. It is characterized in general by fundamental and characteristics distortions in form and content of thinking and perception (loosening of associations, delusions, and hallucinations), mood (flattened, inappropriate, or blunted affect) and behavior (bizarre, apparently purposeless and stereotyped activity or inactivity). The signs and symptoms are diverse, encompassing almost every aspect of cognition and behavior and are generally characterized as positive or negative. Positive symptoms are those that are brought on by the disorder (e.g. hallucinations, delusions) while those qualities taken away by the illness (e.g. one’s drive and motivation are gone) are referred to as negative symptoms.