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Grand mean olfactory ERPs referenced to linked mastoids and reference–free CSD waveforms for the total sample (N = 67) at all 31 recording sites (averaged across intensity).Horizontal and vertical electrooculograms (EOG), which are shown at a smaller scale before blink correction, indicate no eye artifact concerns. Two prominent CSD components are labeled at sites T7 (N1 sink) and Pz (P2 source), where they closely corresponded to their ERP counterparts.
