Empirical evaluation of a model of global psychophysical judgments: IV. Forms for the weighting function |
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Authors: | Ragnar Steingrimsson R Duncan Luce |
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Institution: | a Department of Psychology, New York University, 6 Washington Place, New York, NY 10003, USA b Department of Cognitive Sciences, University of California, Irvine, Social Science Plaza, Irvine, CA 92697-5100, USA |
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Abstract: | Understanding the psychological interpretation of numerals is of both practical and theoretical interest. In classical magnitude estimation, respondents match numerals to sensations and in magnitude production they select sensations that stand in a prescribed numerical ratio to a given standard. The present work focusses on evaluating several possible, and related, forms for the function W formulating the distortion of numerals. The main form, of which a power function is a special case, is the Prelec exponential/power representation. Behavioral equivalents to power and to Prelec functions are formulated, tested, and rejected. It is argued that either the mathematical form or the assumption W(1)=1 is wrong. Whereas, the axiomatic literature has focussed exclusively on the former inference, we explore the alternate that W(1)≠1. Behavioral axioms are formulated in each case and experimentally tested. We conclude that most respondents satisfy a general power function and that those who do not, satisfy the general Prelec function. |
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Keywords: | Audition Power functions Multiplicative form Numerical distortion Psychophysical regression effect Prelec functions Reduction invariance Ratio production and ratio estimation Weighting function Sequential effects |
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