Figure 3: A typical example of simultaneous recording 128-channel dEEG and sphenoidal electrode (case 1). (a) The EEG (upper) shows a left temporal spike in 19-channel 10/20 display. The lower shows simultaneously recorded left side of sphenoidal EEG. (b) 128-channel dEEG topographic plot of the corresponding spike. The view is looking down on top of the head with nose at the top. The distribution of spike discharge is over the left anterior temporal electrodes. (c) The source estimation by dEEG superimposed on a standard MRI. The interictal spike is localized to left mesial temporal region.