Figure 3: Ictal depth electrode recording showing interruption of the baseline abundant interictal epileptiform activity followed by a widespread, high-frequency rhythmic activity with a good representation in all depth electrodes bilaterally, maximal at the left premotor depth electrode and the adjacent to it left cingulate and left prefrontal depth electrodes. Settings: Bipolar montage, low pass filter 1Hz, high pass filter 70Hz, sensitivity 100uV.