Statistical analysis: voltage amplitude will be averaged within temporal windows (e.g., 20ms), and analyzed with linear mixed effects models using R together with the lme4 and lmerTest packages. This method allows analyzing single trial data, with no averaging across condition or participants, and no discretization of confidence ratings. Models will be performed on each latency and electrode for individual trials, including raw confidence rating and accuracy as fixed effects, and random intercepts for subjects. Statistical significance for electrophysiological data within regions of interest (e.g., frontocentral and left parietal scalp regions) will be assessed after correction for false discovery rate. When possible, cluster-based permutation test will be used.