Table 1.

Individual items for the Monetary Choice Questionnaire (Kirby et al., 1999) used for the delay discounting task. The smaller-sooner (SS) and larger-later (LL) delays were in days. The log k-values are the natural logarithm of the original k-values. The items were delivered in a random order. Items 28–30 were catch trials in which the rewards were both available now but the SS and LL magnitudes differed.

Item	SS Amount	SS Delay	LL Amount	LL Delay	k	log k
1	$34	0	$35	186	0.00016	−8.74
2	$28	0	$30	179	0.0004	−7.82
3	$22	0	$25	136	0.001	−6.91
4	$25	0	$30	80	0.0025	−5.99
5	$19	0	$25	53	0.006	−5.12
6	$24	0	$35	29	0.016	−4.14
7	$14	0	$25	19	0.041	−3.19
8	$15	0	$35	13	0.1	−2.30
9	$11	0	$30	7	0.25	−1.39
10	$54	0	$55	117	0.00016	−8.74
11	$47	0	$50	160	0.0004	−7.82
12	$54	0	$60	111	0.001	−6.91
13	$49	0	$60	89	0.0025	−5.99
14	$40	0	$55	62	0.006	−5.12
15	$34	0	$50	30	0.016	−4.14
16	$27	0	$50	21	0.041	−3.19
17	$25	0	$60	14	0.1	−2.30
18	$20	0	$55	7	0.25	−1.39
19	$78	0	$80	162	0.00016	−8.74
20	$80	0	$85	157	0.0004	−7.82
21	$67	0	$75	119	0.001	−6.91
22	$69	0	$85	91	0.0025	−5.99
23	$55	0	$75	61	0.006	−5.12
24	$54	0	$80	30	0.016	−4.14
25	$41	0	$75	20	0.041	−3.19
26	$33	0	$80	14	0.1	−2.30
27	$31	0	$85	7	0.25	−1.39
28	$21	0	$30	0
29	$39	0	$55	0
30	$56	0	$80	0