Table 1.

Model comparison

Model number (Eq.)	Sum AIC	Delta AIC	Akaike weight
2, (4)—Hyperbolic discounting of utility	3595	0	1
1, (2)—Hyperbolic discounting of magnitude	3630	35	2.51E–08
4, (6)—Exponential discounting of magnitude	3637	42	7.58E–10
3, (5)—Exponential discounting of utility	3660	65	7.68E–15
6, (8)—Beta delta with magnitude	3685	90	2.86E–20
5, (7)—Beta delta with utility	3709	114	1.76E–25
7—As soon as possible	4144	549	6.1E–120

The table displays goodness of fit (AIC) and model comparison results for each of the seven valuation models (see supplemental Methods, available at www.jneurosci.org as supplemental material). Eq., Equation number for each model as listed in the supplemental Methods.