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Grand-average waveforms of the event-related potentials evoked by nociceptive stimulation and corresponding scalp distributions. (A) Grand average (across all participants and the C3, Cz and C4 sites) after removal of the ECG artefact. (B) Grand average prior to artefact removal (left) and corresponding ECG artefact (right). (C) Scalp distribution of the N2 component. (D) Scalp distribution of the P2 component.
