Stimulus-locked grand averages for channels Fz, Cz, Pz and Oz and corresponding temporal profile of the <i>p</i>-values of the Wilcoxon signed rank test comparing participant-by-participant averages and of the Kruskal-Wallis test for all ERPs recorded (irrespective of participant) in each error class.

<p>The dotted lines in the <i>p</i>-value plots represent the 5% confidence level. The corresponding axes are oriented so that values above that line indicate statistical significance and <i>vice versa</i>.