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Walter Rudolf Hess

Walter Rudolf Hess
Born (1881-03-17)March 17, 1881
Frauenfeld, Switzerland
Died August 12, 1973(1973-08-12) (aged 92)
Locarno Switzerland
Nationality Swiss
Fields Physiology
Institutions University of Zurich, ETH Zürich
Alma mater University of Zurich
Notable awards Marcel Benoist Prize (1931)
Nobel Prize in Physiology or Medicine (1949)

Walter Rudolf Hess (March 17, 1881 – August 12, 1973) was a

  • Karl Grandin, ed. (1949). "Walter Rudolf Hess Biography". Les Prix Nobel. The Nobel Foundation. Retrieved 2008-07-24. 
  • C. W. Hess. "W.R. Hess Biography in SANP 2008, Nr. 4" (PDF). 
  • Marc A. Shampo, Robert A. Kyle, and David P. Steensma. "Walter Hess—Nobel Prize for Work on the Brain". 

External links

  1. ^ His Nobel Lecture on "The Central Control of the Activity of Internal Organs"
  2. ^ Hess WR. (1906). "Zum Thema Viskosität des Blutes und Herzarbeit. Dissertation.". Vierteljahresschr Natur forsch Ges Zürich. 51: 236–51. 
  3. ^ a b c d e f g h i j Christian W. Hess. "W.R. Hess Biography" (PDF). Schweizer Archiv für Neurologie und Psychiatrie 159 (4): 255–261. 

Notes and references


Hess also found that he could induce sleep in cats - a finding that was highly controversial at the time but later confirmed by other researches, including his son Rudolf Max Hess.[3]

By stimulating the hypothalamus, he could induce behaviors from excitement to apathy; depending on the region of stimulation. He found that he could induce different types of responses when stimulating the anterior (lateral) hypothalamus compared to stimulating the posterior ventromedial hypothalamus. When stimulating the anterior part, he could induce fall of blood pressure, slowing of respiration and responses such as hunger, thirst, micturition (urination) and defecation. On the other hand, stimulation of the posterior part led to extreme excitement and defense-like behavior.[3]

Hess used brain stimulation techniques that were developed in the late 1920s, using electrodes to stimulate the brain at well-defined anatomical regions. This allowed him to map regions of the brain to specific physiological responses. He developed a special technique he called "interrupted direct-current (DC) stimulation" which used stimuli of long duration (typically 12.5 or 25 ms) with ramp-like upward and downward slopes. Also, the stimuli were rather weak (around 0.5–1.5 V) and of low frequency (2–12 Hz, usually 8 Hz) and he used very fine electrodes with a diameter of 0.25 mm.[3]


Hess retired in 1951 but continued working at the university in an office. In 1967, he moved to Ascona and died of heart failure in 1973 at the age of 92 in Locarno, Switzerland.[3] His widow died in 1987.

In the 1930s, he began animal experimentation.[3]

In 1912, he left his lucrative private practice as an ophthalmologist and went into research under Justus Gaule (1849 - 1939), habilitating in 1913 to become Privatdozent. His main interests were the regulation of blood flow and respiration. During the First World War he spent a year at the Physiological Institute of the University of Bonn under Max Verworn. In 1916, Gaule retired and Hess first became interim director of the Department of the Physiological Institute at the University of Zürich and in 1917 he was officially promoted to full professor and director of the institute as which he served until retirement 1951.[3]

Hess was born in Frauenfeld as the second of three children to Clemens Hess and Gertrud Hess (née Fischer). His father encouraged him to pursue a scientific career and with him he conducted experiments in his physics laboratory. He started to study medicine in Lausanne in 1899 and then in Berlin, Kiel and Zurich. He received his medical degree from the University of Zürich in 1906 and trained as surgeon in Münsterlingen (in the same canton as his birthplace Frauenfeld) under Conrad Brunner (1859 - 1927). He developed a viscosimeter to measure blood viscosity and published his dissertation in 1906 titled Zum Thema Viskosität des Blutes und Herzarbeit.[2] In 1907, he went to the University of Zurich to study under Otto Haab to be trained as an ophthalmologist and opened his own private practice in Rapperswil SG. In these years, he developed the "Hess screen", married Louise Sandmeier and in 1910 their daughter Gertrud Hess was born. In 1913 his son Rudolf Max Hess was born.[3]



  • Life 1
  • Research 2
  • Honors 3
  • Notes and references 4
  • External links 5

. Egas Moniz He shared the prize with [1]

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