lusions or hallucinations with out prominent mood symptoms.
Psychotic disorders may be induced by anot her condition. In substance/medication-
induced psychotic disorder, the psychotic symp toms are judged to be a physiological con-
sequence of a drug of abuse, a medication, or  toxin exposure and cease after removal of the
agent. In psychotic disorder due to anothe r medical condition, the psychotic symptoms
are judged to be a direct physiological consequence of another medical condition.
Catatonia can occur in severa l disorders, including neurod evelopmental, psychotic, bi-
polar, depressive, and other mental disorders.  This chapter also includes the diagnoses
catatonia associated with anot her mental disorder (catatonia  specifier), catatonic disorder
due to another medical condition, and unspecifie d catatonia, and the diagnostic criteria for
all three conditions are described together.
Other specified and unspecified schizophrenia spectrum and other psychotic disor-
ders are included for classifyin g psychotic presentations that do not meet the criteria for
any of the specific psychotic disorders, or  psychotic symptomatology about which there is
inadequate or contra dictory information.
Clinician-Rated Assessment of Symptoms and
 Related Clinical Phenomena in Psychosis
Psychotic disorders are heterogeneous, and th e severity of symptoms can predict impor-
tant aspects of the illness, such as the degree of cognitive or neur obiological deficits. To
move the field forward, a detailed framework fo r the assessment of severity is included in
Section III “Assessment Measures,” which may help with treatment planning, prognostic
decision making, and research on patho physiological mechanisms. Section III “Assess-
ment Measures” also contains dimensional as sessments of the primary symptoms of psy-
chosis, including hallucinations, delusions, disorganized speech (except for substance/