Table 5.

Predicting choice based on brain activity: probit model

	Basic controls			Basic controls plus reward size and delay
	Coefficient	dF/dx	p	Coefficient	dF/dx	p
β area average	0.288	0.11	0.02	0.094	0.03	0.46
δ area average	−0.195	−0.07	0.15	−0.081	−0.03	0.60

Basic controls include indicator variables for each subject, choice number, and number of juice/water squirts in the previous delivery period. Coefficients indicate the effect of a change in activity on the probit index, whereas dF/dx gives the marginal effect of a change of each region's activity at its mean on the probability of choosing early. Statistical significance takes into account clustering of standard errors by subject. Choices for which (D, D′) = (0, 1) are excluded from these regressions.