Parameters of delay discounting assessment: Number of trials, effort, and sequential effects
Abstract
Procedural variants in estimating delay discounting (DD) have been shown to yield significant within-subject differences in estimated degree of delay discounting as well as variations in the patterns of choice. The purpose of this study was to evaluate the effect of subject control over the number of trials in a delay discounting task, on degree of delay discounting. Participants were assessed with two computerized DD assessments: the full-length method presented participants with a fixed set of 240 trials, and the abbreviated task, where once participants had shown indifference between the immediate and delayed rewards, the remaining trials for that delay value were omitted. While the full-length and abbreviated methods did not differentially affect patterns of choice or estimated delay discounting, the order of presentation (ascending or descending) of immediate rewards produced differences in each measure: rate of delay discounting was significantly lower when estimated with the descending sequence; a larger proportion of area under the discounting curve was concentrated around the indifference point trial with the descending sequence; and a lower correlation was observed between estimates obtained across methods with the descending sequence.
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Discount rates are susceptible to order presentation.
“Since discount rates are susceptible to order presentation (Robles & Vargas, 2008)”
From Behavioral trainings and manipulations to reduce delay discounting: A systematic review (2019) · cites this paper as Robles & Vargas, 2008
The difference in design (within-subject with randomly intermixed trials vs between-subject or separate blocks) may explain the failure to replicate the date/delay effect.
“Since discount rates are susceptible to order presentation (Robles & Vargas, 2008), this may explain the failure to replicate the date/delay effect.”
From Behavioral trainings and manipulations to reduce delay discounting: A systematic review (2019) · cites this paper as Robles & Vargas, 2008
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- Authors
- Robles, E., & Vargas, P. A.
- Affiliations
- Arizona State University (US)
- Corresponding author
- Robles, Elias
- Venue
- Behavioural Processes
- Publisher
- Elsevier BV
- Published
- 2008-06
- Volume
- 78
- Issue
- 2
- Pages
- 285-290
- ISSN
- 0376-6357 (ISSN-L)
- OpenAlex
- W2123827602
- Cited by
- 55
- References
- 39
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 2 · 2016: 5 · 2015: 4 · 2014: 4 · 2013: 10 · 2012: 5
- FWCI
- 2.43
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Behavioural Processes (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Decision Sciences › General Decision Sciences › Decision-Making and Behavioral Economics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Social Sciences › Safety Research › Experimental Behavioral Economics Studies
- Keywords
- delay discounting, number of trials, sequential effects, effort, indifference point, within-person variability
- MeSH terms
- Adaptation, Psychological, Adult, Choice Behavior, Female, Humans, Impulsive Behavior, Male, Motivation, Reaction Time, Reference Values, Reward, Serial Learning
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