Delay aversion but preference for large and rare rewards in two choice tasks: implications for the measurement of self-control parameters

Table 1 Synoptic table of comparison among odds, "p", and delay values across ID and PD tasks.

Odds	"p" (%)	A priori Delay (s)	A posteriori Delay (s)
0	100	0	0
1/10	90	1.50	2.50
1/4	80	3.75	6.25
1/3	75	5.00	8.33
1/2	66	7.50	12.50
1	50	15	25
2	33	30	50
3	25	45	75
4	20	60	100	Indifference Point, PD task
5	16.6	75	125
6	14.3	90	150

Delay duration corresponding to each odds level was calculated a priori in the ideal situation (no spontaneous waiting). Equivalence between odds/probability and delay was then re-estimated a posteriori for a more realistic account (the mean inter-trial interval due to spontaneous waiting was around 10 s in the PD task).

ISSN: 1471-2202