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Characterized by delusions, hallucinations, incoherent speech, and illogical thinking. Formerly called "dementia praecox" by Emil Kraeplin, and renamed "schizophrenia" in 1911 by the Swiss psychiatrist Eugen Bleuler. About 1% of the adult population in the United States is affected by schizophrenia. The DSM-IV lists three specific types of schizophrenia: disorganized, catatonic, and paranoid.
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