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Plate 1. A topographical mapping of the Nc component that occurs during sustained attention and inattention for the frequent familiar, infrequent familiar, and infrequent novel stimuli. The data in each figure represent an 80ms average of the ERP for the Nc component at the maximum point of the ERP response. The data are plotted with a cubic spline interpolation algorithm, with an averaged electrode reference, and represent absolute amplitude of the ERP (from Richards, 2000c).