E.H. Weber, a German psychologist, proposed the measure of JND (Just Noticeable Difference) within the year 1934. Weber gave the observation that the dimensions of the differential threshold are proportional to the intensity of the quality stimulus. This ratio is constant. The size of the differential threshold, a continuing ratio of the quality stimulus, is … Read more


You have so far come to know that area of psychophysics concerns the relationship between stimulus intensity and sensory magnitude. Fechner, extending Weber’s law believed that a general equation, with the logarithmic relationship, does exist that holds good for all senses. What Weber Says Weber’s law tells us that each just noticeable stimulus increment is … Read more


Gustav T. Fechner (1801–1887), professor of physics at the University of Leipzig, sought to measure the mind quantitatively. In approaching this task he studied stimuli and the sensations they aroused. His interest was in ascertaining how sensations changed with changing stimulation. While lying in bed on the morning of October 22, 1850, he conceived the … Read more