The Nobel Prize in Physiology or Medicine was awarded to Walter Rudolf Hess in 1949 for his systematic mapping of the diencephalon. By stimulating specific anatomical regions of the cat brain with precise electrical currents, he identified the pathways responsible for regulating internal organs, effectively bridging the gap between neurological activity and autonomic bodily functions.
Clinical Training and Early Practice
Born in 1881 in Frauenfeld, Hess pursued medical studies at the University of Zurich, graduating in 1906. He initially specialized in ophthalmology under Otto Haab, later establishing a private practice in Rapperswil. During this period, he developed the Hess screen and authored his dissertation on blood viscosity. By 1912, he shifted his focus toward physiological research, eventually becoming a full professor at the University of Zurich in 1917.
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His primary research involved the application of interrupted direct-current stimulation to the brains of cats. Using electrodes only 0.25 mm in diameter, he applied weak, low-frequency stimuli to map physiological responses. This methodology enabled him to distinguish between functional areas of the hypothalamus. He discovered that the anterior hypothalamus governed functions like respiration and blood pressure, while the posterior regions triggered defense mechanisms and states of extreme excitement.
Professional Contributions and Recognition
Beyond his laboratory findings, Hess engaged in academic and institutional leadership. He served as the director of the International Foundation for the High Alpine Research Station Jungfraujoch from 1930 to 1937 and actively defended animal experimentation against anti-vivisection movements. His work earned him the Marcel Benoist Prize in 1931, the Carl-Ludwig Honorary Medal in 1938, and international recognition through the 1949 Nobel Prize.
Later Years
Following his retirement from the University of Zurich in 1951, Hess remained active in an office setting within the institution. In 1967, he relocated to Ascona. He died in 1973 in Muralto at the age of 92, leaving a body of work that influenced the understanding of autonomic nervous system control and human physiology.
Fast facts
- Born: 1881, Frauenfeld
- Died: 1973, Muralto
- Nobel Prize: 1949
- Primary Field: Physiology
- University: University of Zurich
- Citizenship: Switzerland
- Notable Prize: Marcel Benoist Prize (1931)
- Notable Prize: Carl-Ludwig Honorary Medal (1938)
Questions readers ask
What was the core finding of his Nobel-winning research?
He mapped the hypothalamus to demonstrate how specific brain regions control internal organ functions.
Did Hess only work in neuroscience?
No, he initially trained and practiced as an ophthalmologist and surgeon before transitioning to physiology.
Achievements
- Marcel Benoist Prize — 1931
- Nobel Prize in Physiology or Medicine — 1949
- Carl-Ludwig Honorary Medal — 1938
- Held posts at University of Zurich
- Fields: human physiology, ophthalmology and neuroscience
