dependent variable. An approach facial-expression DFA asymmetry score was computed by averaging across asymmetry during angry and happy faces for the four days of EEG recording, whereas a withdrawal facial-expression DFA score was calculated by averaging across asymmetry scores during fearful and sad faces for the four days. In addition, a resting EEG asymmetry score was created by averaging asymmetry scores across all eight resting sessions (2 sessions per day). The result of these calculations was a total of twelve asymmetry scores (one rest, approach, and withdrawal score for each of four reference modes) per participant at each homologous pair. The lifetime MDD by condition interaction was of interest in order to investigate the capability model of EEG asymmetry. Cohen’s d is reported to quantify effect size for significant differences between lifetime MDD+ and MDD− groups.
