Psychophysical Measures of Intensity

Abstract

Luce’s theory of semiorders resolve a problem with just noticeable differences - intransitivity of equality. Bisection measurement gives an alternative approach. This is related to Ramsey’s representation theorem for probability and utility. Stevens’ indirect magnitude production method can be given a rigorous analysis. Torgerson’s experiments suggest that subjects cannot distinguish between estimating equal intervals and equal ratios. Problems of cross-modality matching are explored.