 Psychosis is a serious mental condition in which a person momentarily loses contact with reality. People in a state of psychosis may experience hallucinations or delusional beliefs that make day-to-day functioning difficult. During the early development of psychosis, people undergo an initial change in mood, thinking, or behavior that may include making mistakes about smells, sounds, or sights; becoming easily distracted; and developing suspicions of others. These basic symptoms can be early warning signs of a brain disorder, including anxiety disorder, depression, or psychotic disorder. Basic symptoms may be due to a number of factors, including a reaction to stress or drugs or just a part of normal adolescence. To identify psychosis early and accurately, more information is needed on the initial stages, biological markers, and progression of psychosis. This study will gather information on the natural history of the basic symptoms of psychosis to identify factors that may affect the improvement or persistence of the symptoms. 