A Comparison of Category Scaling Methods.
COLUMBIA UNIV NEW YORK PSYCHOPHYSICS LAB
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Two models for the analysis of category scaling experiments are presented. Both theories partition the judgments into a perceptual and a motivational component. The decision mechanisms of the theories are linear in the Thurstonian case and hierarchical for the second theory. The experiments to test the theories were category scaling experiments of the loudness of 500 Hz tones. Unlike most such experiments, feedback and differential payoffs were used. The results reject the hierarchical model. The Thurstonian model describes the data very well. This model leaves the stimulus parameters invariant when payoffs varied. The response bias parameters shifted as if the subjects were attempting to maximize expected income or some utility transform of that value. Author