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Stimulus-locked ERPs. a Grand average CSD maps for N2 and P3b intervals. b ERPs at FCz, per Group and Block, for pretest (solid lines) and posttest (dashes lines), vertical lines indicate stimulus onset. c Average N2 peak amplitudes at FCz, per group and session. d N2 peak amplitude change (posttest–pretest) per group for crosstalk only. Error bars denote SE. * p ≤ 0.05
