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Psychophysical scaling is discussed in terms of two basic approaches: measurement of the errors of discrimination and the erection of a scale based upon variability of judgments (Weber-Fechner approach) and measurement of magnitudes by direct subjective judgments (category and ratio scaling approaches). Each approach yields its own unique psychophysical function relating physically measured magnitudes to subjective intensities. The more direct approaches of category and ratio scaling are preferred because of their simplicity of use and because experimental findings can be translated into applications with greater ease.
sensory mechanisms, psychophysics, scale (ratio), category scaling, logarithm functions, sweetness, odor intensity, magnitude estimation
Head, U.S. Army Natick Development CenterMPI Sensory Testing, NatickN.Y., Mass.N.Y.