Algebraic models for integration of painful and nonpainful electric shocks |
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Authors: | Bill Jones |
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Affiliation: | 1. Carleton University, K1S 5B6, Ottawa, Ontario, Canada
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Abstract: | Subjects rated the average intensity of two sequentially presented electric shocks, which were either painful (intensity range from 1 to 4 mA, Experiment 1) or nonpainful (intensity range from .6 to .9 mA). In both experiments, stimuli were presented in a 4 by 4 factorial design to allow tests of algebraic models of the integration process under analysis of variance (Anderson, 1970, 1974). Both sets of data were fit by the equation Ri j=w1s1+w2+s2, (w1+w2=1), where Ri jis the rating scale response, s1 and s2 the scale values for the first and second stimuli, respectively, and w1 and w2 associated weights. When stimuli were painful, w1=w2, and when stimuli were nonpainful, w1< w2. Subjective scale values as a function of stimulus intensity appear to increase nonlinearly for painful stimuli and linearly for nonpainful stimuli. Some implications of the results for pain research are discussed. |
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