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That breathing is a vital issue for the mental integrative functioning must have been felt in the days when primitive humanity shaped its linguistic designations for mind. Breath is the most obvious sign of life and its absence the most obvious sign of death, and this sine qua non gave us the terms psyche, anima, and the Semitic root ruach — breathing or breath being made to stand for the very soul. But the rôle of good or poor breathing in the sense of well-being and the effect of the emotional states on the breathing might well have attracted more attention.
Businger devotes his rhinologic experience and technic directly to a study, explanation and treatment of schizophrenia. After an instructive review of the determiners and the effects of the "inversions" of the normal "parallel stream" of the air column, he gives his observations on schizophrenic patients. He brings the frequency
Inversions-Atmung und Geisteskrankheit. Untersuchungen über die Dynamik der Atmung bei der Schizophrenie und Versuch einer physio-pathologischen Grundlegung derselben. Zugleich ein Beitrag für Probleme der Atmungspathologie und Rhinologie.. Arch NeurPsych. 1931;25(2):450. doi:10.1001/archneurpsyc.1931.02230020238020