More than a century ago, Emil Kraepelin identied a disorder that he termed ‘dementia praecox’. He argued that the key features of this psychotic disorder included rapid cognitive and behavioural decline (dementia) and an early age of onset in young adults (praecox). Since Kraepelin’s seminal description of the disorder that is now known as schizophrenia, researchers have attempted to clarify whether
1. Cognitive changes in schizophrenia show a progressive and deteriorating course.