Fig. 1.

First EEG findings. 20 s of 19-channel EEG, referenced to bipolar (upper window) and average (lower window) reference, showing intermittent 4 Hz activity in the bilateral parasagittal region (as shown). Background posterior activity at 8 Hz is unstable but symmetric. Black lines: recordings from the right hemisphere. Blue lines: recordings from the left hemisphere. Green lines: midlines traces. Distance between orange vertical bars: 1 s. Patient was awake during this period of recording (exploring the space, not speaking, not answering to simple verbal orders). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)