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a severe mental disorder in which thought and emotions are so impaired that contact is lost with external reality

Psychoses is a severe mental disorder in which the person experiences delusions, hallucinations, breaks from reality, and a variety of other extreme behavioral disturbances. This is severe enough that the person typically has to be institutionalized.

A severe psychological disturbance that generally requires hospitalization of the person.

serious mental disorder in which perception of reality and ability to communicate is impaired. Can be biological or emotional in origin.