- Karl von Vierordt
Infobox Scientist
name = Karl von Vierordt
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caption = Karl von Vierordt
birth_date = July 1, 1818
birth_place =Lahr , Baden
death_date = November 22, 1884
death_place =Tübingen
residence = German
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field =medicine
work_institutions =University of Tübingen
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known_for =sphygmograph
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Karl von Vierordt (July 1, 1818,Lahr , Baden – November 22, 1884,Tübingen ) was a Germanphysician . He studied at the universities ofBerlin ,Göttingen ,Vienna , andHeidelberg , and began a practice inKarlsruhe in 1842. In 1849 he became a professor of theoretical medicine at theUniversity of Tübingen , and in 1853 a professor ofphysiology .Vierordt developed techniques and tools for the monitoring of blood circulation. He is credited for the construction of an early "hemotachometer", an apparatus for monitoring the velocity of blood flow. Also, a device called a
sphygmograph was created in 1854 by Vierordt [Citation
id =PMID :16409431
url= http://www.ncbi.nlm.nih.gov/pubmed/16409431
last=Roguin
first=A
publication-date=2006 Jan
year=2006
title=Scipione Riva-Rocci and the men behind the mercury sphygmomanometer.
volume=60
issue=1
periodical=Int. J. Clin. Pract.
pages=73-9
doi = 10.1111/j.1742-1241.2005.00548.x] . It was a mechanism consisting of weights and levers used to estimateblood pressure , and is considered a forerunner of the modernsphygmomanometer . One of his better known written works was a treatise on the arterial pulse titled "Die Lehre vom Arterienpuls im gesunden und kranken Zustände".Vierordt also made substantial contributions to the psychology of
time perception , via his book (published in 1868) "Der Zeitsinn nach Versuchen", "The experimental study of the time sense". This reported a large number of experiments on the perception of duration, with the time sense being considered a "general sense" along with the perception of space, in contrast to the "special senses" such as vision and hearing. Included in this book is discussion of, and evidence for, what has come to be known as Vierordt's Law: roughly the proposition that short durations tends to be overestimated, while long durations tend to be underestimated. Between these two extremes is a "point of indifference" where the "time sensation", in Vierordt's terminology, corresponds exactly to physical time. However, the 1868 book does much more than report this "law", and contains extensive discussions of different methods used to measure duration perception, as well as different sorts of errors that can occur. Although Vierordt was not the first person to carry out experiments on time perception, his 1868 book involved much more extensive experimentation and discussion than had been carried out up until that time.Contributions
[http://vlp.mpiwg-berlin.mpg.de/technology/data?id=tec51 Sphygmograph]
References
External links
* [http://vlp.mpiwg-berlin.mpg.de/people/data?id=per166 Picture, short biography and bibliography] in the
Virtual Laboratory of theMax Planck Institute for the History of Science
Wikimedia Foundation. 2010.