On the other hand, we found increased connectivity of slower wave bands (delta, theta, alpha) for both EA genders. These results confirm previous finding of increased absolute theta log power at all locations on the scalp of eyes-closed EEGs of alcohol-dependent individuals44 and increased frontal45 and occipital46 theta in binge drinkers, as well as, increased interhemispheric47 and intrahemispheric theta coherence48 when compared to controls. Increased cortical theta is usually linked to deep resting stages49, transition to sleep 50 and while practicing meditation 51. These mental processes relate to the suggested model of the “posterior salience network” unfolded in a functional connectivity analysis during rest as an interoceptive network, regulating central somatic awareness, physiological reactivity and internal homeostatic states52, 53. These results suggest that higher-theta-connectivity alcohol-vulnerable individuals have reduced outside attention over introspect inside attention.
