Methodological considerations in the study of delay discounting in intertemporal choice: A comparison of tasks and modes |
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Authors: | Carter L Smith Donald A Hantula |
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Institution: | (1) Department of Psychology, Washington University, Campus Box 1125, 63130 St. Louis, MO; |
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Abstract: | An experimental comparison of two commonly used delay-discounting procedures (binary choice and fill in the blank) and modes
of administration (paper and pencil and computer based) was conducted. Statistically significant main effects were found for
task type—steeper discounting was observed in the binary-choice task— but not for mode of administration. As simple evidence
of validity, hyperbolic curves consistently provided a better fit to the data than did exponential curves for both tasks.
Further, magnitude effects were also observed across conditions. Correlational results varied largely as a function of the
discounting index (either k or area under the curve) under consideration. Across the two tasks, discounting indices showed modest levels of reliability
r(AUC)=.33; r(k)=.75]. The findings pointed to refinements for both the methodology and criteria that are used to study delay discounting
and raised questions about the commonly assumed relationship between discounting and the construct of impulsivity. |
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Keywords: | |
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