Table 2. ECoG spectral amplitude alteration induced by an epileptic seizure.
| (A) Maximal Augmentation of ECoG Spectral Amplitude during the Epileptic Seizure. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Frequency Band | Delta | Theta | Alpha | Sigma | Beta | Low-Frequency Gamma | High-Frequency Gamma | Very-High-Frequency Gamma | |||
| Patient #1 | Left Frontal Neocortex (the seizure focus) | 44.5 | 125.4 | 293.9 | 196.2 | 135.6 | 69.2 | 51.1 | 74.2 | ||
| Left Frontal Neocortex (the nonepileptic cortex surrounding the focus) | 16.2 | 9.2 | 18.8 | 11.0 | 27.3 | 26.9 | 9.1 | 10.1 | |||
| Left Parietal Neocortex | 5.3 | 3.0 | 4.4 | 8.0 | 6.6 | 2.9 | 10.0 | 9.1 | |||
| Left Temporal Neocortex | 6.1 | 7.5 | 6.2 | 7.2 | 6.9 | 4.3 | 3.0 | 3.8 | |||
| Left Medial Temporal Region | 4.1 | 5.2 | 3.6 | 5.5 | 2.5 | 2.5 | 2.5 | 1.5 | |||
| Patient #2 | Right Frontal Neocortex | 0.9 | 1.4 | 2.3 | 2.8 | 1.5 | 1.1 | 0.7 | 0.7 | ||
| Right Parietal Neocortex | 2.3 | 0.5 | 1.6 | 2.9 | 1.4 | 1.4 | 1.3 | 1.6 | |||
| Right Temporal Neocortex | 1.1 | 1.0 | 2.2 | 2.2 | 1.1 | 1.5 | 0.5 | 0.6 | |||
| Right Medial Temporal Region | 1.5 | 2.1 | 2.0 | 3.1 | 0.8 | 0.4 | 1.3 | 2.0 | |||
| Left Medial Temporal Region | 5.1 | 10.2 | 7.3 | 11.0 | 12.0 | 11.7 | 4.0 | 6.1 | |||
| (B) Maximal Attenuation of ECoG Spectral Amplitude during the Epileptic Seizure. | |||||||||||
| Patient #1 | Left Frontal Neocortex (the seizure focus) | -1.2 | -0.1 | 0.2 | -0.2 | 0.7 | 1.3 | -1.4 | -1.7 | ||
| Left Frontal Neocortex (the nonepileptic cortex surrounding the focus) | -1.4 | -1.3 | -2.5 | -1.3 | -1.3 | -2.4 | -2.3 | -2.2 | |||
| Left Parietal Neocortex | -0.4 | -0.8 | -0.6 | -0.5 | -0.4 | -0.7 | -3.0 | -2.4 | |||
| Left Temporal Neocortex | -1.5 | -1.5 | -1.5 | -2.4 | -1.2 | -2.4 | -1.3 | -1.3 | |||
| Left Medial Temporal Region | -1.6 | -1.2 | -1.4 | -1.8 | -3.2 | -1.8 | -2.8 | -2.7 | |||
| Patient #2 | Right Frontal Neocortex | -0.5 | -1.2 | -0.8 | -1.1 | -1.8 | -1.2 | -1.7 | -1.1 | ||
| Right Parietal Neocortex | -1.2 | -1.0 | -0.7 | -0.7 | -0.8 | -0.9 | -1.2 | -1.2 | |||
| Right Temporal Neocortex | -1.2 | -1.2 | -1.6 | -1.2 | -1.4 | -1.7 | -1.7 | -1.4 | |||
| Right Medial Temporal Region | -0.9 | -1.4 | -2.7 | -1.3 | -1.6 | -0.9 | -1.3 | -1.6 | |||
| Left Medial Temporal Region | -1.9 | 1.0 | -0.3 | -0.2 | -0.7 | -1.4 | -1.1 | -1.2 | |||
The maximum z-score for each frequency band and each lobe during the period between the seizure onset and offset is described. Patient 1 had the seizure focus in the left superior frontal region and augmentation of ECoG spectral amplitudes in all eight freqeuncy bands (0.5 – 200 Hz) was noted in the seizure focus during the active seizure period. Patient 2 had a seizure arising from the left medial temporal region; augmentation of ECoG spectral amplitudes in six freqeuncy bands involving 4 – 64 Hz and 100 – 200 Hz was noted in the seizure focus during the active seizure period.
The minimum z-score for each frequency band and each lobe during the period between the seizure onset and offset is described. Neither patient 1 nor patient 2 had a z-score smaller than -6 in any electrode site or frequency band during the active seizure period.