PMC6434162_01
Stereo-EEG demonstrating evolution over time in a 4 contact regions in the right posterior orbito-frontal region, consisting of new-onset rhythmic delta activity (RDA) (T1; T2), lateralized periodic discharges (LPDs; T3), and interictal-ictal continuum (IIC) pattern and electrographic status epilepticus (T4; T5).
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Frequency bandwidths used were delta 1-4 Hz, theta 4-8 Hz, alpha 8-13 Hz, beta 13-30 Hz, and gamma 30-70 Hz. The EEG was visually analyzed and five-minute epochs from each of the described interictal and ictal activities are illustrated in Fig. 1. Finally, the PSD was compared with recordings from the contralateral (left) posterior orbitofrontal electrode that served as a control.
Power spectral density (PSD) shown for the control region (left posterior orbitofrontal; LPOF) versus the area adjacent to the posttraumatic hemorrhage (right posterior orbitofrontal; RPOF). PSD demonstrates an increase in delta power initially and then a sustained reduction in frequency variability when compared with the internal control electrode symmetrically placed within the contralateral orbitofrontal region.
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Transform) and a moving window of 0.5 s with 50% overlap, and the average values per frequency bandwidth were used to create the graphs (Fig. 2).