2.4. Requirement that at least one of two required symptoms to meet criterion A be delusions, hallucinations, or disorganized speech.
Schizophrenia is conceptualized as a psychotic disorder and this change simply requires psychotic pathology in the diagnosis. Delu- sions, hallucinations, and disorganized speech are core “positive symptoms” diagnosed with high reliability and might reasonably be considered necessary for a reliable diagnosis of schizophrenia (Black and Boffeli, 1990; David and Appleby, 1992). This should have little