= 2 .. 5). Although the ERP N1 maximum is at FCz, Cz shows the most negative value across the nine centrotemporal sites (marked as gray circles in Fig. 8A). Similarly, overall N1 minima (most positive values) are bilaterally at inferior temporal-parietal sites (TP9/10 or mastoids), but at T7 and T8 when considering only these centrotemporal sites (i.e., the measured potentials are consistent with the data series depicted in Figs. 4 and 7). Likewise, the corresponding surface Laplacian estimates at these sites, although being integrated in an overall CSD topography, basically reiterate the surface Laplacian spline patterns across these sites (cf. Fig. 7, bottom), showing sharper and enhanced transitions for more flexible splines but a smoother and more gradual distribution for more rigid splines.9
