...tion is between frontal and occipital alpha, as determined by the location where the peak is most prominent; another is between ‘‘fast’’ and ‘‘slow’’ alpha (higher and lower frequency, respectively) (=-=Klimesch, 1999-=-). Generally, the alpha peak frequency is lower at frontal electrodes than at occipital electrodes. Frontal-occipital frequency differences in alpha peaks can result in overlapping double peaks (‘‘spl...