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Thouless ratio


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A modified version of the Brunswik ratio of perceptual constancy, influenced by Fechner's law, given by (log  R – log  S)/(log  A – log  S), where R is the physical magnitude or intensity of the stimulus chosen as a match, S is the physical magnitude or intensity for a stimulus match with zero constancy, and A is the physical magnitude or intensity that would be chosen under 100 per cent constancy. The ratio is equal to zero when there is no perceptual constancy and 1 when there is perfect constancy. [Named after the English psychologist Robert Henry Thouless (1894–1984) who proposed it in 1931]

Subjects: Psychology.


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