Schizophrenia

Kurt-Schneider Criteria
1) First-rank symptoms
- audible thoughts
- voices arguing or discussing or both
- voices commenting
- somatic passitivity experiences
- thought withdrawal and other experiences of influenced thought
- thought broadcasting
- delusional perceptions
- all other experiences involving volition made affects, and made impulses
2) Second-rank symptoms
- other disorders of perception
- sudden delusional ideas
- perplexity
- depressive and euphoric mood changes
- feelings of emotional impoverishment
- "....and several others as well"

DSM-IV-TR Diagnostic Criteria for Schizophenia
A) Characteristic symptoms: two or more of the following, each present for a significant portion of time during 1-month period:
    - delusions
    - hallucinations
    - disorganized speech
    - grossly disorganized or catatonic behaviour
    - negative symptoms: affective flattening, alogia, avolition
B) Social/ occupational dysfunction
    - major areas of functioning i.e. work, interpersonal relations, or self-care are markedly below the level achieved prior to onset
C) Duration: continuous signs of disturbances persist for at least 6 months.
D) Schizoaffective and mood disorder exclusion
E) Substance/ general medical condition exclusion
F) Relationship to a pervasive developmental disorder