Schizophrenia remains the most complex, puzzling, and because of its tendency towards chronicity, the most severe of the mental disorders. It is a very heterogeneous disorder characterized by extreme disruptions of thought, per ception, behavior, and emotion. About I % of the population worldwide will experience at least one schizophrenic episode. Most of the patients will have a number of exacerbations leading in about 30% of cases to a chronic residual state, due either to the illness itself or to psychosocial environmental factors, or-most likely-to the interaction of both. Given the...