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Illustration of Facial Expression as a function of Relevance as revealed by the LPP component. ERP waveforms for an exemplary centro-parietal sensor (CP1) for happy, neutral, and angry faces when relevant or non-relevant. Topographical difference maps (relevant–non-relevant) display the averaged time interval (450–700 ms) plotted on a top view of a model head. Analyzed time window for the LPP are highlighted in gray.
