University Pickatlas utility (Maldjian et al., 2003; 2004). These regions included the cingulate gyrus and the amygdala. The statistical threshold for the ROIs was set at 0.05, and k was set at 20 voxels. In addition, whole brain analyses were also completed. Finally, in order to determine the relationship between marijuana use and discrete patterns of activity during the masked affect task, regression analyses were completed between the BOLD signal data and both the total number of smokes per week and urinary cannabinoid level for the smokers.
