al., 2015; Popescu et al., 2019). Alpha frequency EEGc is of particular interest as alpha activity has been implicated in studies of impaired memory and cognitive decline in older adults (Babiloni et al., 2018; Blinowska et al., 2017; Hogan, Swanwick, Kaiser, Rowan, & Lawlor, 2003; Zhang et al., 2021), and is hypothesized to be related to acetylcholine levels in the brain (Babiloni et al., 2013; Sharma & Nadkarni, 2020). Childhood trauma is associated with increased right alpha EEG asymmetry (Meiers, Nooner, De Bellis, Debnath, & Tang, 2020), which has also been linked to low mood and social withdrawal in adolescence (Stewart, Towers, Coan, & Allen, 2011). Yet, only a single, small study of EEG functional connectivity and trauma in adolescence has been published (Cook et al., 2009). Correlations of brain connectivity measures with attention and psychopathology suggest that increased EEG functional connectivity contributes to deficits in cognitive functioning and psychopathology (Canuet et al., 2011; Imperatori et al., 2015; Kamarajan et al., 2020; Zinn, Zinn, & Jason, 2016), but without longitudinal data, cannot be definitively tested. To the best of our knowledge, EEGc specifically has not yet been examined longitudinally as a biological marker that may link trauma exposure to alcohol-related
