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<p>by experimental results on the sense of touch and light obtained in the early 1830s by the German physiologist <a href="page.php?w=Ernst_Heinrich_Weber">Ernst Heinrich Weber</a> in <a href="page.php?w=Leipzig">Leipzig</a>, most notably those on the minimum discernible difference in intensity of stimuli of moderate strength (<a href="page.php?w=just-noticeable_difference">just-noticeable difference</a> or JND) which Weber had shown to be a constant fraction of the reference intensity, and which Fechner referred to as Weber's law. From this, Fechner</p><p>
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