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R Fischer, F Griffin, RC Archer, SC Zinsmeister & PS Jastram. 
“Weber Ratio in Gustatory Chemoreception; An Indicator of Systemic (Drug) Reactivity”. 
Nature (London). 1965 September 4.
The exponential nature of the perceptual process has been amply documented through the years from Fechner's discovery in 1860, to Stevens' proposed modification of it in 1961. In order to propagate quantitative information, the nerve cells canot increase the intensity of the impulses; they only increase their frequency. Katz and Adrian found that this frequency is proportional to the logarithm of the intensity of the stimulus. It appears now that Stevens' Power Law describes sensation magnitude before adaptation to a test stimulus, whereas the Fechner Discriminabiity Law describes it after adaptation.
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