Many cognitive phenotypes have been employed to study AD and related dementias (ADRD). Electroencephalography (EEG) is a cost-effective and widely available method that provides functional data with a high temporal resolution which makes it an ideal modality to investigate complex diseases such as ADRD, PTSD, and AUD (Smit et al., 2021). EEG coherence (EEGc) is a heritable measure of functional connectivity derived by comparing the synchrony of EEG oscillations recorded at two different brain regions (Chorlian et al., 2007; Markovska-Simoska, Pop-Jordanova, & Pop-Jordanov, 2018). Previous studies have noted increased functional connectivity in cross-sectional studies of childhood trauma, AUD, and PTSD (Cook, Ciorciari, Varker, & Devilly, 2009) Almli et al., 2018; Dunkley et al., 2015; Y. Huang, Mohan, De Ridder, Sunaert, & Vanneste, 2018; Park et al., 2017). Using a longitudinal framework, a study recently found that childhood assaultive trauma is associated with changes in frontal alpha EEGc and subsequent AUD and PTSD symptoms, with evidence of sex specific findings in a sample of trauma-exposed and non-exposed individuals (Neale et al., 2024). Although numerous EEG studies have described differences in functional
