To control for possible differences between groups and/or conditions in baseline power, which represents the critical variable for computing and normalizing ERS/ERD estimates (Delorme & Makeig, 2004; Makeig, 1993; Roach & Mathalon, 2008), separate repeated measures ANOVAs were performed on baseline power, which was effectively summarized by combined theta/alpha and beta activity. There were no significant group or group × condition effects in these analyses (all F[1,38] ≤ 1.57, all p ≥.22).
