Figure 5
Ictal onset for patient #7. The first and last 6 channels are from the 3 OPMs over the right and left anterior temporal lobe, respectively, with alternating channels recording in the OPMs’ By and Bz direction (which is, in this case, in the anterior–posterior direction and approximately perpendicular to the scalp (inwards), respectively). The grey vertical lines mark 1 s of data, that were filtered between 3–48 Hz. Note the increase in fast activity, simultaneously over both hemispheres, after about 9 secs, marking the start of the seizure (red vertical line). This is followed by artefacts due to movement during the seizure. Although it cannot be ruled-out that the fast activity during the 3 secs before the bodily movements was due to muscle activity, we believe that this is unlikely as the clinical onset of the seizure (blinking) started ~ 2 s after the onset of the fast activity (see Supplemental Material), and no other movements were discernible during that period (compare also with video-EEG recording in Supplemental Material).
