A five-choice adaptive delay-discounting task that estimates a discount rate in about a minute.
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Task parameters
The immediate option is always half: 500 now vs. 1000 later.
Euro by default, with the published amounts unchanged, as in the euro version of Mas-Cuesta et al. (2022); the original studies used US dollars.
The paper does not say where the options appeared in this task; its adjusting-amount task placed them at random on each trial. Here each side gets half of the five choices.
Koffarnus & Bickel (2014): the first delay is 3 weeks; each “later” choice moves to a longer delay and each “now” choice to a shorter one (8, 4, 2, 1 steps through 31 delays from 1 hour to 25 years). Outputs: ED50 (the delay at which the delayed amount is worth half) and k = 1 / ED50, with ln(k), flagged as a bound when the participant reaches either end of the delays. No practice: every choice counts. About 1 minute.
A year counts as 365.25 days and a month as 365.25 / 12 days, which reproduces the ED50 values of Koffarnus & Bickel (2014, Table 1).
This is a researcher preview. No participant data is recorded.
Simulated participant view
A five-choice adaptive delay-discounting task that estimates a discount rate in about a minute.
No data is recorded
Two option cards per choice: half the amount now or the full amount after a delay. The delay of each next choice depends on the previous answer.
Useful when delay discounting is measured repeatedly, e.g. daily in EMA, or when a full questionnaire would take too long.
Less suitable when a study needs the precision of a longer procedure from a single session, or discount rates for several reward sizes.
Choose the delayed amount (half of it is offered now) and the currency. Use the same amount across sessions so rates stay comparable. The defaults follow Koffarnus & Bickel (2014): 1,000 later vs. 500 now, a first delay of 3 weeks, and a year of 365.25 days, which reproduces the ED50 values of their Table 1.
The first delay is 3 weeks; each choice moves the next delay along 31 steps from 1 hour to 25 years. Five choices give a coarse estimate, which is why the task suits repeated measurement; average across sessions for stable individual rates.
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