Fig. 3

The grand averaged ERPs elicited by task stimuli in patients and controls, respectively. a Grand average ERP waveforms recorded at six frontal midline electrodes (F1, FZ, F2, FC1, FCZ, FC2) evoked by congruent tasks (black lines) and incongruent tasks (red lines), with the yellow and blue boxes referred to the early MFN and late MFN respectively. b Grand average ERP waveforms recorded at three regions (left frontal, right frontal and parietal regions) evoked by congruent tasks (black lines) and incongruent tasks (red lines), with the SP component marked by green boxes