conditions (2nd and 3rd columns of Figs. 3b, 4b, 5b, 6b). For the purpose of illustrating group and condition differences in relative localization of the power density of these frequency bands, scalp surface Laplacian measures were computed and plotted for the evoked power of delta (200-600 ms), theta, (200-400 ms), slow alpha (200-300 ms), and fast alpha (100-200 ms) bands for both groups and task conditions (1st and 4th columns of Figs. 3b, 4b, 5b, 6b). The TFR areas used for the computation of scalp surface Laplacian measures for each of these frequency bands are shown within the white dashed rectangular boxes with an arrow indicating the specific frequency that is represented in the plots of the respective figure. The selection of the TFR plot from a specific electrode shown with the surface Laplacian plot of specific frequency bands was made based on the relative regional densities of the frequency bands as well as on previous literature.
