Kraepelin's influence on the next century thumb|right|Emil Kraepelin In the 1899 (6th) edition of , Kraepelin established a paradigm for psychiatry that would dominate the following century, sorting most of the recognized forms of insanity into two major categories: dementia praecox and manic-depressive illness. Dementia praecox was characterized by disordered intellectual functioning, whereas manic-depressive illness was principally a disorder of affect or mood; and the former featured constant deterioration, virtually no recoveries and a poor outcome, while the latter featured periods of exacerbation followed by periods of remission, and many complete recoveries. The class, dementia praecox, comprised the paranoid, catatonic and hebephrenic psychotic disorders, and these forms were found in the Diagnostic and Statistical Manual of Mental Disorders until the fifth edition was released, in May 2013. These terms, however, are still found in general psychiatric nomenclature.
Kraepelin's influence on the next century thumb|right|Emil Kraepelin In the 1899 (6th) edition of  Kraepelin established a paradigm for psychiatry that would dominate the following century sorting most of the recognized forms of insanity into two major categories dementia praecox and manic-depressive illness Dementia praecox was characterized by disordered intellectual functioning whereas manic-depressive illness was principally a disorder of affect or mood; and the former featured constant deterioration virtually no recoveries and a poor outcome while the latter featured periods of exacerbation followed by periods of remission and many complete recoveries The class dementia praecox comprised the paranoid catatonic and hebephrenic psychotic disorders and these forms were found in the Diagnostic and Statistical Manual of Mental Disorders until the fifth edition was released in May 2013 These terms however are still found in general psychiatric nomenclature