He was an accomplished musician, being adept at playing violin and cello.[4] It is believed that he was the first scientist to conduct studies on the role of bow pressure, contact point and bow speed in the determination of tone color.[5] During his time spent at the University of Freiburg he conducted studies involving animal psychology that included intelligence testing with monkeys.[2] He is also credited as the inventor of the red adaptation goggles.[6]
Der Gesichtssinn; Grundzüge der physiologischen Optik (with Erich Schütz), 1924 – The sense of sight; Principles of physiological optics.
Die natürlichen grundlagen der kunst des streichinstrumentspiels, 1925 – The natural foundations concerning the art of stringed instrument exercises.
Anleitung zu den physiologischen übungen für studierende der medizin, 1938 – Instructions on physiological exercises for medical students.
Zur Kenntnis der Kurvengestalt der Vokalperiode in ihrer Beziehung zu den Vorgängen im Kehlkopf, 1940 – A treatise on the processes in the larynx associated with vowel sounds.
Zur Kenntnis des abnormen Farbensinns und seiner Vererbung, 1941 – Information on abnormal color sense and heredity.
Über den Licht- und Farbensinn, 1943 – On light and color sense.[7]
He was also co-editor of the periodical Zeitschrift für die gesamte experimentelle Medizin.[1]
