The Group × Previous trial accuracy interaction was significant, F(2, 90) = 4.58, p = .01, and was qualified by a significant Group × Current trial type × Previous trial accuracy interaction, F(2, 90) = 4.26, p = .02 (Table 1). To simplify display and interpretation of this interaction, and for comparability with previous reports (see Bartholow et al., 2012; Ridderinkhof et al., 2002), we subtracted compatible trial RTs from incompatible trial RTs to create a CE for each participant. Figure 1 displays the CE as a function of group and previous trial accuracy. For the control group, the CE did not differ following errors (M = 46 ms, SD = 47) and correct responses (M = 50 ms, SD = 16), (F < 1). For the placebo group, the CE was marginally smaller on trials following errors (M = 44 ms, SD = 48) than on trials following correct responses (M = 58 ms, SD = 19),, F(1, 32) = 3.44, p = .07. In contrast, for the alcohol group, the CE was larger on trials following errors (M
