Bleuler defined schizophrenia as a group of diseases rather than just one disorder. He defined the main symptoms of the disease as the four A's: associations, affect, ambivalence, and autism. Bleuler explained the four A's in his book Dementia Praecox or the Group of Schizophrenias.

How does someone get schizophrenia?

The exact causes of schizophrenia are unknown. Research suggests a combination of physical, genetic, psychological and environmental factors can make a person more likely to develop the condition. Some people may be prone to schizophrenia, and a stressful or emotional life event might trigger a psychotic episode.

What are positive signs of schizophrenia?