The Hermann grid, a visual phenomenon where phantom grey spots appear at intersections of a white grid on a black background, takes its name from the German physiologist Ludimar Hermann. His experimental approach to scientific inquiry relied on meticulous construction of apparatus, allowing for the precise physical measurements that underpinned his research into human biology.
Academic Foundation and Career
Born in Berlin in 1838, Hermann pursued his medical education at Frederick William University Berlin and Humboldt-Universität zu Berlin. He served as a university teacher and physician, holding significant positions at the University of Zurich and the University of Königsberg. During his tenure at Königsberg, he served as rector from 1878 to 1880. His professional contributions earned him recognition from international institutions, including his election as a Foreign Member of the Royal Society in 1905, as well as memberships in the Göttingen Academy of Sciences and Humanities, the American Academy of Arts and Sciences, the Accademia Nazionale dei Lincei, and the Royal Academy of Medicine of Belgium.
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Hermann’s work in physiology frequently challenged existing scientific consensus. He disputed the theory held by Emil du Bois-Reymond regarding ordered electromotive molecules within muscles, arguing instead for a model based on chemical activity. He demonstrated that the surface of an uninjured muscle remains electrically equipotential. These findings informed the development of the electrocardiograph. Furthermore, he provided a detailed explanation of the digestive process, identifying it as the decomposition of protein through acid hydrolysis to supply necessary cellular materials. Outside of his primary research, he was well known for his editorial work on a comprehensive textbook regarding physiology.
Phonetics and Acoustic Science
As a speech scientist, Hermann investigated the mechanics of vowel production by testing theories originally proposed by Robert Willis and Charles Wheatstone. He utilized the Edison phonograph, applying photographic registration and magnification to analyze the physical grooves on records. This methodology enabled him to demonstrate that air passage through the mouth cavity significantly influences the harmonics of laryngeal tones. In the course of this acoustic research, he coined the term formant, which remains a foundational concept in modern phonetic studies. Hermann died in Königsberg in 1914.
Fast facts
- Born: 1838, Berlin
- Died: 1914, Königsberg
- Nationality: German
- Primary Occupations: Physician, university teacher, physiologist
- Notable Positions: Rector of University of Königsberg (1878-1880)
- Significant Honors: Foreign Member of the Royal Society (1905)
- Notable Scientific Term: Formant
Questions readers ask
What is the Hermann grid?
It is an optical illusion, first reported by Ludimar Hermann, where phantom grey dots appear at the intersections of a grid of white lines on a black background.
What was Hermann's contribution to phonetics?
He used phonograph technology to analyze vowel production and coined the term formant to describe the spectral peaks of the sound spectrum.
Achievements
- Held posts at University of Zurich and University of Königsberg
