highly significantp <0.001
A repeated measures ANOVA including the within-subject factors RESPONSE (errors versus correct hits) and CONDITION (placebo versus control), carried out on the ERN amplitudes averaged across the three frontocentral electrodes (Fz, FCz, and Cz), revealed a highly significant main effect of RESPONSE ( F (1,17) = 25.0, p <0.001), showing, as expected, a larger ERN for errors relative to fast hits.