The 2 sets of seed-correlation/EEG-coherence components that were significantly correlated but did not differentiate between LTAA and NSAC were comprised of two seed-correlation components that each correlated to the same EEG-coherence component. This EEG-coherence component that was equally represented in NSAC and LTAA was dominated by high alpha2 coherence between central, parietal, and occipital electrodes bilaterally, and likely reflects normal alpha rhythms in both groups. This alpha-dominated component was negatively correlated with a seed-correlation component (r = − 0.57, t39 = − 4.30, corrected p = 0.007) that had no distinguishing features, and positively correlated with a seed-correlation component (r = 0.53, t39 = 3.93, corrected p = 0.003) that showed high synchrony between NAcc and medial frontal cortex and low synchrony between NAcc and the vicinity of the brainstem (perhaps pons, ventral tegmental area, or reticular nuclei). These regions represent networks where synchrony with the NAcc was either unaffected by long-term alcohol use or has completely resolved with abstinence.
