Table 1.
EEG dataset and seizure onset summary.
| Patient No. | Age gender | Duration of implantation (days) | No. of seizures (no. of subclinical seizures) | No. of seizures recorded at 2000 Hz (no. of subclinical seizures) | No. of interictal EEG epochs selected (tot. duration in min) | No. of preictal EEG epochs selected (tot. duration in min)a | Selected electrodes | Seizure onset |
|---|---|---|---|---|---|---|---|---|
| 1 | 40F | 7 | 7 (0) | 4 (0) | 9 (477) | 4 (66) | RA, RH, RP | Medial structures of right temporal lobe |
| 2 | 29M | 10 | 8 (0) | 8 (0) | 10 (662) | 8 (147) | RA, RH, RP, LA, LH | Most seizures had onset in right MTL |
| 3 | 42F | 15 | 34 (31) | 6 (3) | 10 (665) | 8 (163) | RA, RH, RP, LA, LH, LP | Right temporal predominanceb |
| 4 | 46M | 19 | 25 (14) | 6 (2) | 10 (659) | 8 (126) | RA, RH, RP, LA, LH, LP | Right hippocampusc |
| 5 | 44F | 11 | 14 (1) | 6 (0) | 10 (666) | 6 (116) | RA, RH, RP, LA, LH, LP | Bilateral independent epileptiform generatorsd |
| 6 | 40F | 13 | 56 (40) | 16 (12) | 9 (594) | 4 (52) | RA, RH, RP, LA, LH, LP | Focal onset in the left posterior hippocampuse |
| Total | 144 (86) | 46 (17) | 58 (3723) | 38 (670) |
(R = right, L = Left, A = Amygdala, H = Hippocampus, P = Parahippocampus).
Some seizures were excluded from the analysis because they did not meet the 2 h. separation criteria.
Bilateral temporal epileptic generators in both mesial temporal lobes independently. Right-sided generator appears to be much more important.
Preponderance of the right temporal lobe to generate seizures, mostly in the hippocampus. Hippocampal areas and amygdale were also involved.
Interictal discharges more prominent on the left, more confined to the hippocampus and parahippocampus. Right diffuse interictal discharges involving H, PH, and A areas and temporal neo-cortex. 12 of 14 seizures originated from the left MTL structures.
Depth electrode LP.