Final answer:
Emil Kraepelin referred to schizophrenia as Dementia Praecox, a term denoting an early onset mental illness with a deteriorating course, distinguishing it from other psychotic disorders.
Step-by-step explanation:
Emil Kraepelin referred to schizophrenia as Dementia Praecox. This term was introduced by Kraepelin in the late 19th century to describe a group of disorders that are characterized by early onset and chronic, deteriorating course, distinguishing them from other psychotic disorders, which he grouped under the term manic depression. The term Dementia Praecox has since been replaced by the term schizophrenia, a mental illness that affects about one percent of people in the United States and involves symptoms such as the inability to differentiate between reality and imagination, hallucinations, delusions, difficulty thinking, and social withdrawal. Schizophrenia is managed through a treatment protocol that often includes antipsychotic medications designed to block dopamine receptors.