Scientists at MIT and Harvard say schizophrenia may blur the boundary between internal and external realities by overactivating a brain system that is involved in self-reflection. The researchers report that this causes patients to have an exaggerated focus on themselves. Experts have long thought that the thought problems associated with schizophrenia were caused by disconnections in brain regions that controlled perceptions and emotions. But in a new study, scientists found that schizophrenia...