Ernst Heinrich Weber

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”. 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. ==University career==

Weber spent his entire academic career at the University of Leipzig. 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). He was professor of physiology and anatomy from 1840 to 1866, and returned to the position of professor of anatomy from 1866 to 1871. Ernst Weber died in 1878 in Leipzig, Germany. ==Contributions==

Just-Noticeable Difference 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". 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. :\frac{\Delta R}{R} = k ::\Delta R: amount of stimulation that needs to be added to produce a jnd ::R: amount of existing stimulation (R from the German Reiz, meaning stimulus) ::k: constant (different for each sense) Weber’s law is invalid when the stimulus approaches the upper or lower limits of a sensory modality. Fechner took inspiration from Weber’s Law and developed what we know today as Fechner’s Law, claiming that there was a logarithmic relation between stimulus intensity and perceived intensity. Fechner’s Law was more advanced than Weber's Law, partly because Fechner had developed new methods for measuring just-noticeable differences in different sense modalities, making the measured results more accurate. Throughout these working relationships, Weber completed research on the central nervous system, auditory system, anatomy and function of brain, circulation, etc., and a large portion of research on sensory physiology and psychology. The following items are part of Weber’s contributions the experimental psychology: Experimental Wave Theory Studied flow and movement of waves in liquids and elastic tubes. Hydrodynamics Weber discovered laws and applied them to circulation. In 1821, Weber launched a series of experiments on the physics of fluids with his younger brother Wilhelm. This research was the first detailed account of hydrodynamic principles in the circulation of blood. Weber continued his research on blood and in 1827, he made another significant finding. Weber explained the elasticity of blood vessels in the movement of blood in the aorta in a continuous flow to the capillaries and arterioles. Two-point Threshold Technique This technique helped map sensitivity and touch acuity on the body using compass technique. Points of a compass would be set at varying distances in order to see at what distance are the points of the compass perceived as two separate points instead of one single point. Weber also wrote about and tested other ideas on sensation including a terminal threshold, which is the highest intensity an individual could sense before the sensation could not be detected any longer. Weber’s Illusion Weber’s Illusion is an "experience of divergence of two points when stimulation is moved over insensitive areas and convergence of two points when moved over sensitive areas". Weber’s use of multivariate experiment, precise measurements, and research on sensory psychology and sensory physiology laid the groundwork for accepting experimental psychology as a field and providing new ideas for fellow 19th century psychologists to expand. ==Publications==

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". 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"). • Anatomia comparata nervi sympathici (1817) • De aure et auditu hominis et animalium (1820) • Tractatus de motu iridis (1821) • Wellenlehre auf Experimente gegründet (1825) Joint works with his brothers Wilhelm Eduard Weber and Eduard Friedrich Weber: • Zusätze zur Lehre vom Bau und von der Verrichtung der Geschlechtsorgane (1846) • Die Lehre vom Tastsinn und Gemeingefühl (1851) • Annotationes anatomicae et physiologicae (1851) ==Legacy and influence==

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. 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. == See also ==