Fig. 8 | Scientific Reports

Fig. 8

From: Population-based spectral characteristics of normal interictal scalp EEG inform diagnosis and treatment planning in focal epilepsy

Fig. 8

Variability in EEG power and phase characteristics based on factor loading values. (A) Variability in the power spectra of EEGs whose PSD loadings score in the bottom 10-percentile (low), between 40-60-percentile (medium), and top 10-percentile (high). Examples are shown for factors 3, 4, and 5. (B) 8-Hz-filtered EEG traces of the weakest (top) and strongest (bottom) channel pairs for an example EEG that scored in the top 10-percentile for factor 3 (whose spectral power peaks at 8 Hz). Overlapping EEG traces reveal phase relationships, i.e., time lags that maximize correlation within the channel pairs. These lags or phase differences are visualized in polar coordinates (right).

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