ABSTRACT
For psychologists, the objection provided an opportunity to either take sides with the physiologists at the risk of losing their own scientific identity, or to pursue an independent third way between neo-Kantian philosophy and established natural science. G. T. Fechner gave to his final major article on psychophysics the title “On the Principles of Psychophysical Measurement and Ernst Heinrich Weber’s Law: A Discussion with A. Elsas and Alfred Kohler”. A. Stadler and F. A. Muller went further and claimed that stimulus intensity and sensation-magnitude were not sufficiently “homogeneous” to permit a researcher to take a stimulus intensity and transform that stimulus intensity compellingly into a sensation-magnitude. With respect to the condition that one magnitude can be said to “equal” another magnitude taken from the same scale of magnitudes, particular attention must be paid to the views of Johannes von Kries.
