The 27-item Kirby questionnaire of choices between smaller-sooner and larger-later amounts, scored for small, medium and large rewards.
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Task parameters
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.
Off by default: the published questionnaire lists the immediate option first (shown on the left). Randomising the sides is a lab choice.
The 27 items of Kirby, Petry & Bickel (1999), with the published amounts shown in the chosen currency and every delay stated in days. Outputs: discounting rate k overall and for small (25–35), medium (50–60) and large (75–85) amounts by Kirby's consistency method, each with the share of consistent choices; every trial records the item number. No practice: every choice counts. About 3 minutes.
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Simulated participant view
The 27-item Kirby questionnaire of choices between smaller-sooner and larger-later amounts, scored for small, medium and large rewards.
No data is recorded
Two option cards per item: a smaller amount today or a larger amount in a stated number of days.
Useful when a study needs a widely used, comparable discounting measure, or the magnitude effect (lower discount rates for larger rewards).
Less suitable for very frequent EMA, because the fixed items become familiar with repetition.
Keep the published item order and layout for comparability with the literature: the 27 items of Kirby, Petry & Bickel (1999) in their order, with the immediate option first (left). The amounts are shown as published in the chosen currency.
k is estimated by Kirby's consistency method. For the published lookup-table scoring, score the exported trial data (e.g. with the automated scorer of Kaplan et al., 2016).
Add Monetary Choice Questionnaire (Kirby) to your ESM study on SMAAT — free to get started.