Fig. 1. Sensor layout of the 128-channel geodesic sensor net and voltage maps for the response-locked error minus correct difference for the error-related negativity (ERN)
and post-error positivity (Pe) and the stimulus-locked incongruent minus congruent N2. The solid-line circle indicates fronto-central recording sites averaged for ERN and
N2 activity, the dotted-line circle indicates centro-parietal recording sites averaged for Pe amplitudes.