In and out of schizophrenia: Activation and deactivation of the negative and positive schemas.

Theorists, clinicians, and investigators have attempted to find a common source for the negative and positive symptoms of schizophrenia. We propose that a unified theory, based on a common cognitive structure not only has explanatory value, but can serve as a framework for a psychotherapeutic intervention. Specifically, we propose that the cognitive triad - the negative view of the self, others, and the future - is the source of the content for the negative and positive symptoms. We report literature supporting the relationship between each facet of the negative triad and each of the key symptoms: expressive negative symptoms, delusions, and verbal hallucinations. We conclude that the literature supports the validity of the cognitive model of negative and positive symptoms. The cognitive model furthers the understanding of the positive and negative symptoms of schizophrenia, and we describe how this provides a framework for a psychotherapeutic intervention.