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Fechner's general formula for getting at the number of units in any sensation is S = c log R, where S stands for the sensation, R for the stimulus numerically estimated, and c for a constant that must be separately determined by experiment in each particular order of sensibility.
Fechner's reasoning has been criticized on the grounds that although stimuli are composite, sensations are not.
" Every sensation ," says William James, " presents itself as an indivisible unit ; and it is quite impossible to read any clear meaning into the notion that they are masses of units combined.

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