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EGI 64-Channel Sensor layout. The EGI 64 electrode HydroCel Geodesic Sensor Net is displayed above. Diamond electrodes indicate fronto-central recording sites for ERN and Theta (Electrodes 7, 4, 54) and triangle electrodes indicate centro-parietal recording sites for Pe (Electrodes 34, 33, 36, 38). The electrode map is used with permission from Electrical Geodesics, Inc. (EGI), Eugene, OR, USA.
