The FSW appears as a relatively low-frequency negative deflection developing later in the stimulus-locked epoch in tasks invoking cognitive control (see West & Alain, 1999, 2000). The FSW differentiates correct responses from errors (West & Travers, 2008) and is larger on incongruent than congruent Stroop trials (Bailey, West, & Anderson, 2010; West & Alain, 1999, 2000; West, Bailey, Tiernan, Boonsuk, & Gilbert, 2012). The FSW is thought to reflect activity in the lateral prefrontal cortex related to implementation of or adjustments in control (West & Bailey, 2012; West et al., 2012). Consistent with this idea, studies have demonstrated that FSW amplitude is correlated with behavioral indices of adjustments in control (Bailey et al., 2010; Bartholow et al., 2006), and varies along with the amount of conflict present within a block of trials (West & Bailey, 2012). Previous studies (Bartholow et al., 2006; Curtin & Fairchild, 2003) also have shown that alcohol attenuates FSW amplitude during cognitive control tasks. To our knowledge, however, no previous study has investigated whether the FSW is sensitive to the accuracy of the previous trial. If
