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Grand-averaged ERPs at two frontal electrodes (FC1 and FC2), and left (OM1) and right (OM2) mastoidal electrodes for activation of implant electrodes 3 (apical), 7 (mid), 11 (mid), and 15 (basal). FC1 and OM1 refer to the contralateral hemiscalp and FC2 and OM2 to the ipsilateral hemiscalp. Negativity is up.
