Abstract
Sensory scales fall into two classes. Type I scales of sensory intensity can be approximated by metric scaling procedures (magnitude estimation, magnitude production) and nonmetric procedures (conjoint measurement); Type I scales are supported by theoretical consideration of sensory processes. Type II scales of sensory dissimilarity can be approximated by metric scaling procedures (category rating, interval estimation, equisection) and nonmetric procedures (analysis of proximities). The psychophysical functions that relate Type I and Type II scales to their corresponding physical scales are in both cases power functions, but the exponents that govern Type I functions are typically about twice as large. Both Type I scales of sensory intensity and Type II scales of sensory dissimilarity are meaningful measures of perceptual experience, but they are measures of different aspects of perception. The duality of sensory scales helps to explain some apparent contradictions among divergent attempts to validate scales of sensation.
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This study was supported by Grant AFOSR70-1950 with the United States Air Force Office of Scientific Research.
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Marks, L.E. On scales of sensation: Prolegomena to any future psychophysics that will be able to come forth as science. Perception & Psychophysics 16, 358–376 (1974). https://doi.org/10.3758/BF03203956
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DOI: https://doi.org/10.3758/BF03203956