The Beverage group × N2 interaction significantly predicted the CE in RT, β = −.38, t(83) = −3.62, p = .001. This interaction was probed by computing separate linear regressions testing the association between N2 and RT CEs in each beverage group. N2 amplitude predicted the size of the CE in RT for those in the placebo group, β = −.53, t(29) = −3.39, p = .002, and (marginally) the control group, β = −.36, t(22) = −1.83, p = .08. This was not the case for the alcohol group, however, β = −.21, t(29) = −1.18, p = .25 (see Figure 5A). The full model explained a significant proportion of variance in the CE, R2 = .15, F(2, 83) = 7.02, p = .002.
