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Grand averaged ERPs for frontal (F3, Fz, F4), frontal-central (FC3, FCz, FC4), central (C3, Cz, C4), central-parietal (CP3, CPz, CP4), and parietal (P3, Pz, P4) scalp sites elicited by pictures in each experimental condition. Shaded areas correspond to the time window for P2 (130–180 ms), N2 (220–300 ms), early (350–450 ms), and late LPP (550–1000 ms).
