Dementia Praecox; or the Group of Schizophrenias

Eugen Bleuler, a prominent psychiatrist, introduced the term schizophrenia in 1911 in his work Dementia Praecox; or, The Group of Schizophrenias. He challenged the prevailing view that dementia praecox was a single, incurable disease that always led to dementia. Instead, Bleuler proposed it was a group of related illnesses characterized by disordered associations and a fragmentation of personality. He also introduced the concepts of autism (loss of contact with reality) and ambivalence (coexisting contradictory feelings) as fundamental to understanding schizophrenia. Bleuler believed that psychosis could have psychological causes, diverging from the idea that it was solely due to organic brain damage. The term schizophrenia eventually replaced dementia praecox, which had been used by Emil Kraepelin to distinguish it from bipolar disorder.12