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The first part of this book is a philosophic argument in favor of the view that normal thought processes follow definite rules and that concepts of the normal individual are common to all normal persons. This common basis for thought is designated by the author as collective, and the common concepts as collective structures. He believes that the ideas expressed by the schizophrenic patient occur because of an inability to actualize the collective structures and the consciousness belonging to these structures. He states that his theory does not attempt to explain the cause of this inability in the schizophrenic patient, but that the explanation must be approached from a physiologic basis which is not as yet practicable.
Das schizophrene Denken: Phänomenologische Studien zum Problem der widersinningen Sätze.. JAMA. 1930;94(9):658. doi:10.1001/jama.1930.02710350058033