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E. Scheerer (1987)
Tobias Mayer--experiments on visual acuity (1755).Spatial vision, 2 2
A. Köhler (1886)
Über die hauptsächlichen Versuche einer mathematischen Formulierung des psychophysischen Gesetzes von WeberPhilosophische Studien, 3
The paper presents a translation of excerpts from Fechner's (1887) paper “On the principles of mental measurement and on Weber's law”, which was his last and “most perfect” (Wundt) statement of the assumptions underlying his outer psychophysics. Fechner maintains that all measurement, including mental measurement, rests on the principle that n magnitudes that are judged equal may be added and result in a magnitude n times as large as the individual magnitudes. He concedes that bisection methods fulfill this principle as well as just noticeable differences. Weber's law is not a necessary precondition of mental measurement; its validity is an empirical question rather than a matter of principle. The differential threshold is not an inherent property of sensation or attention, but depends on the unavoidable spatio-temporal noncoincidence of stimuli and of the sensations corresponding to them. Given this presupposition and assigning a value of zero to the absolute threshold, it is possible to arrive at a scale of sensation differences, and thus of sensations, from a scale of difference sensations.
Psychological Research – Springer Journals
Published: Aug 24, 2004
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