Group means (±SE) for evoked and induced theta were as follows: evoked theta (log-transformed power; NAC: 0.61 ± 0.06, LTAA: 0.26 ± 0.07, STAA: 0.25 ± 0.09) and induced theta (theta ERS, calculated as the log ratio of poststimulus/prestimulus power; NAC: 0.15 ± 0.03, LTAA: 0.28 ± 0.04, STAA: 0.44 ± 0.05). In order to understand the shared and/or unique variance between the evoked and induced theta measures, first at an overall level (without regard to alcohol vs. control group differentiation), we performed correlations (Pearson's r) between them, collapsing across group. Evoked and induced theta were not associated, r = −0.01, P = 0.96, showing that they are independent measures, sharing no significant variance.
