Ernst Heinrich Weber
Ernst Heinrich Weber (24 June 1795 – 26 January 1878)[1] was a German physician who is considered one of the founders of experimental psychology. He was an influential and important figure in the areas of physiology and psychology during his lifetime and beyond. His studies on sensation and touch, along with his emphasis on good experimental techniques led to new directions and areas of study for future psychologists, physiologists, and anatomists.
For other people named Ernst Weber, see Ernst Weber (disambiguation).
Ernst Heinrich Weber
24 June 1795
Leipzig University
(MD, 1815)
Ernst Weber was born into an academic background, with his father serving as a professor at the University of Wittenberg. Weber became a doctor, specializing in anatomy and physiology. Two of his younger brothers, Wilhelm and Eduard, were also influential in academia, both as scientists with one specializing in physics and the other in anatomy. Ernst became a lecturer and a professor at the University of Leipzig and stayed there until his retirement.
Early life and education[edit]
Ernst Heinrich Weber was born on 24 June 1795 in Wittenberg, Saxony, Holy Roman Empire. He was son to Michael Weber, a professor of theology at the University of Wittenberg. At a young age, Weber became interested in physics and the sciences after being heavily influenced by Ernst Chladni, a physicist often referred to as the “father of acoustics”.[2] Weber completed secondary school at Meissen and began studying medicine at the University of Wittenberg in 1811. He went on to receive his MD in 1815 from the University of Halle.[3]
University career[edit]
Weber spent his entire academic career at the University of Leipzig.[3] He completed his Habilitation in 1817 and became an assistant in J.C. Clarus’ medical clinic in the same year. He became professor of comparative anatomy in 1818 and chair of human anatomy at the university in 1821.[1] Ernst Weber’s first direct contribution to psychology came in 1834 when trying to describe the sensation of touch (De Pulsu, Resorptione, Auditu et Tactu. Leipzig 1834).[4][5] He was professor of physiology and anatomy from 1840 to 1866, and returned to the position of professor of anatomy from 1866 to 1871.[3]
In his later life, Weber became less involved in testing and experimenting, although he was still interested in sensory physiology. Ernst Heinrich Weber retired from the University of Leipzig in 1871. He continued to work with his brother, Eduard and their work with nerve stimulation and muscle suppression lead to inhibitory responses as a popular therapy of the time.[6] Ernst Weber died in 1878 in Leipzig, Germany.[7]
Contributions[edit]
Just-Noticeable Difference[edit]
Weber described the just-noticeable difference or jnd as follows: “in observing the disparity between things that are compared, we perceive not the difference between the things, but the ratio of this difference to the magnitude of things compared.” In other words, we are able to distinguish the relative difference, not the absolute difference between items. Or, we can distinguish between stimuli having a constant ratio, not a constant difference. This ratio is known as the Weber fraction. Weber’s first work with the jnd had to do with differences in weight. He stated that the jnd is the "minimum amount of difference between two weights necessary to tell them apart".[8] He found that the finest discrimination between weights was when they differed by 8–10%. For example, if you were holding a 100 g block, the second block would need to weigh at least 108 g in order to be distinguishable. Weber also suspected that a constant fraction applied for all senses, but is different for each sense. When comparing the differences in line length, there must be at least 0.01 difference in order to distinguish the two. When comparing music pitch, there must be at least 0.006 vibrations per second difference.[8] So for every sense, some increase in intensity is needed in order to tell a difference.
Weber's work on the tactile senses was published in Latin as De Subtilitate Tactus (1834), and in German as Der Tastsinn und das Gemeingefühl in 1846. Both works were translated into English by Ross and Murray as E.H.Weber: The Sense of Touch (Academic Press, 1978) and reprinted as E.H.Weber on the Tactile Senses (Erlbaum, Taylor & Francis, 1996). Weber proposed there was a threshold of sensation in each individual. The two-point threshold, the smallest distance between two points where a person determines that it is two points and not one, was Weber’s first discovery.
Weber’s work made a significant impact on the field of experimental psychology, as he was one of the first scientist to test his ideas on humans. His meticulous notes and new ideas of testing subjects described in his book Der tastsinn und das gemeingefühl (English: "The sense of touch and the common sensibility") led E. B. Titchener to call the work "the foundation stone of experimental psychology".[12]
The book that described blood circulation research, Wellenlehre, auf Experimenten gegrϋndet (English: "Wave Theory, Founded on Experiments") became instantly recognized as very important to physics and physiology. This research lead the way for future investigating, although it was not formally published until 1850 with the culmination of the rest of his research on blood in a book entitled, Ueber die Anwendung der Wellenlehre auf die Lehre vom Kreislauf des Blutes und insbesondere auf die Pulslehre (English: "Concerning the application of the wave theory to the theory of the circulation of the blood and, in particular, on the pulse teaching").[13]
Joint works with his brothers Wilhelm Eduard Weber and Eduard Friedrich Weber:
Legacy and influence[edit]
Weber is often cited as the pioneer or father of experimental psychology. He was the first to conduct true psychological experiments that held validity. While most psychologists of the time conducted work from behind a desk, Weber was actively conducting experiments, manipulating only one variable at a time in order to gain more accurate results. This paved the way for the field of psychology as an experimental science and opened the way for the development of even more accurate and intense research methods.[14] One of Weber’s greatest influences was on Gustav Fechner. Weber was appointed the Dozent of Psychology at the University of Leipzig the same year that Fechner enrolled. Weber’s work with sensation inspired Fechner to further the work and go on to develop Weber’s law. At the time of his sensation work, Weber did not fully realize the implications that his experiments would have on understanding of sensory stimulus and response.[7]
