Parallel ICA revealed 3 sets of significantly correlated seed-correlation/EEG-coherence components. Of these 3 sets, however, only one was comprised of components that were also significantly different between LTAA and NSAC. This pair of components had a correlation coefficient of r = − 0.60 (t39 = − 4.71, corrected p = 0.002). A two-sample t-test computed on the loading parameters for the seed-correlation map showed group difference with corrected p = 0.0004 (t39 = 4.54), with LTAA having higher loading than NSAC. Because LTAA had more lifetime smokers and fewer years of education, we compared the loading parameters for the seed-correlation maps using a linear model, covarying for smoking and education. This analysis showed a group difference with p = 0.005 (t37 = 2.97), so smoking and education could not explain all of the group difference. Examination of the rs-fMRI seed-correlation map component, after converting to z-scores and thresholding at | z | > 1.96, shows higher NAcc seed-correlation in the dorsolateral prefrontal cortex bilaterally but more pronounced on the left (consistent with a bigger effect for inhibitory control vs. emotion
