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ERP waveforms recorded at frontal and fronto-central electrodes as a function of block [Congruent (Congr.) and Incongruent (Incongr.)] and task switching (No-Switch and Switch). Stimulus onset occurred at 0 ms (also indicated by the vertical line on the waveforms). The shaded area indicates the latency window (250–450 ms) used for measuring mean MFN/D-pos amplitude.
