Table 5.

Exploratory continuous analyses of brain activity in relation to the behavioral economic index of impulsivity (i.e., hyperbolic temporal discounting function, k). Panel A presents significant correlations (Pearson r) between regions of interest and level of impulsivity based on decision making performance. Panel B presents stepwise regression of a model incorporating the regions implicated in zero-order correlations, resulting in the exclusion of three. Asterisks reflect statistical significance p <.05. Final model overall R² =.62, adjusted R² = .54. Region coordinates are provided in Tables 2 and 3.

A.	Region	k	2	3	4	5
	1. Ventral Striatuma,d	.58*	--
	2. Temporoparietal Cortexa,c	−.58*	−.28	--
	3. Medial Frontal Gyrusb,d	.63*	.80*	.18	--
	4. Middle Temporal Gyrusb,d	.59*	.56*	−.10	.58*	--
B.	Region	B (SEM)	β
	Medial Frontal Gyrusb,d	.06* (.02)	.54*
	Temporoparietal Cortex a,c	−.05* (.02)	−.48*

Superscripts:

^aa priori region of interest;

^bfunctionally defined region of interest;

^cactivity during impulsive choices;

^dactivity during restrained choices.