Measuring Delay Discounting in Humans Using an Adjusting Amount Task

Journal of Visualized Experiments : JoVE
Charles C J FryeAmy L Odum

Abstract

Delay discounting refers to a decline in the value of a reward when it is delayed relative to when it is immediately available. Delay discounting tasks are used to identify indifference points, which reflect equal preference for two dichotomous reward alternatives differing in both delay and magnitude. Indifference points are key to assessing the shape of a delay-discounting gradient because they allow us to isolate the effect of delay on value. For example, if at a 1 week delay and a maximum of $1,000, the indifference point is at $700 we know that, for that participant, a 1-week delay corresponds to a 30% reduction in value. This video outlines an adjusting amount delay-discounting task that identifies indifference points relatively quickly and is inexpensive and easy to administer. Once data have been collected, non-linear regression techniques are typically used to generate discounting curves. The steepness of the discounting curve reflects the degree of impulsive choice of a group or individual. These techniques have been used with a wide range of commodities and have identified populations that are relatively impulsive. For example, people with substance abuse problems discount delayed rewards more steeply than control pa...Continue Reading

Citations

Jan 25, 2019·Journal of the Experimental Analysis of Behavior·Jonathan E FriedelMichael E Andrew
Nov 19, 2019·Movement Disorders : Official Journal of the Movement Disorder Society·Eva MartinezLéon Tremblay
Apr 3, 2018·The Psychological Record·Meredith S BerryAmy L Odum
Oct 28, 2019·Perspectives on Behavior Science·Jillian M RungGregory J Madden
Nov 13, 2020·Psychopharmacology·Cory CzuczmanRebecca L Ashare

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