[The history of schizophrenias: philosophical roots]

Although the term "schizophrenia" has been introduced in medical usage by E. Bleuler, all variations of schizophrenia developed afterwards trace back to E. Kraepelin. In his work on dementia praecox he intended to discover a yet unknown entity from nature definitely following the principles and maxima of positivism. In the following a great number of different concepts of schizophrenia were developed and the psychiatrist of the seventies and eighties of the last century was left confronted with an abundance of varying schizophrenic criteria. The upcoming globalization in diagnostic stopped this process of diversity and the ideas of Kraepelin reappeared in the ICD-10 criteria for schizophrenia with only a few modifications. The main problem of positivistic research approaches is that nature obviously is completely unimpressed by human made principles of rules and systems. Nature itself does not know these forms and categories invented by human beings. That is one of the reasons why positivistic schizophrenic research considering human made categories as natural has not been quite successful. A possible way out of this diagnostic dilemma -- insufficient categorical classification systems on the one hand and the necessity of apprehending psychopathological phenomena for an effective therapy on the other -- can be a change of paradigms from the usual categorical diagnostics based on the maxima of positivism to dimensional diagnostics developed in the frame of post-modern strategies of thinking. Such process-oriented diagnostic approaches considering the singular phenomenon as well as its significance for the individual and its pathogenesis as main foci of diagnostics provide the possibility for post-modern psychiatrists to start a new dialogue overcoming a positivism based monologue made by experts on the sufferers.