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Differentiation of Mesial and Neocortical Temporal Lobe Epilepsy by Video‐Electrocorticogram Monitoring

power spectral analysis. The phase correlation between spike-and-wave complex (SWC) and spike component (SpC) in D3SW also was evaluated. Eight epileptic patients (three boys and five girls, age 518 years) were selected for investigation. TA was diagnosed in all on a routine EEG. Four-channel bipolar EEGs (T3-C3, C3-Cz, CzC4, C4-T4) including D3SW were recorded and then sampled (250 Hz for sampling frequency) by personal computer. D3SW was selected at the length of 6,144 points and then sequentially divided into 40 overlapping segments (512 pointshegment). Sevenchannel EEGs were reconstructed, fixing the reference (T3-C3, T3-Cz, T3-C4, Cz-C4, Cz-T4, Cz-C3, Cz-T3) in each segment. Four sets (C3-Cz, Cz-C4, C3-T3, C4-T4) of 40 cross-power spectral arrays were calculated by short-time Fourier transformation (STFT) after trend-subtraction. Two spectral peaks (-3 Hz representing SWC; -9 Hz representing SpC) were chosen, and the temporal changes of their corresponding phase values were analyzed for the spatial distribution pattern and for the two types of correlation (spatial and SWC vs. SpC). The phase of SWC showed a symmetric distribution pattern (most preceding at Cz, symmetrically delaying toward the lateral side of the hemispheres) in all cases, whereas that of SpC showed the difference in some cases. However, the spatial correlation was sparse even in the phase of SWC. The phase correlation between SWC and SpC was not significant except in the case of one patient who had protracted generalized tonic-clonic seizures and TAs. The results showed the interand intrahemispheric phase characteristics of D3SW, comparing SWC with the corresponding SpC, and confirmed the centrencephalic system hypothesis. The results also suggest another mechanism for the generation of wave component other than the cortical recurrent inhibition theory, because we could not find significant linear correlation between the phases of SWC and SpC.