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The year 2010 marks the 150th anniversary of Elements of Psychophysics [Elemente der Psychophysik] by Gustav Theodor Fechner (1801–1887) in Leipzig, Germany. [ 1 ] It is near consensus among historians of psychology that this two-volume work was the first major publication to demonstrate that psychological phenomena could be studied experimentally and quantitatively. Going well beyond indications in this direction by some physiologists (especially his former teacher, colleague, and friend, Ernst Heinrich Weber), Fechner proposed a sweeping research program for a new field of science, which he called psychophysics. Nineteen years after Elements appeared, Wilhelm Wundt institutionalized experimental psychology by establishing a formal laboratory and research institute at Leipzig University. In doing so, he drew upon the work of Fechner, among others, to justify the need for a continuous enterprise, the...