Fig. 4.

Comparison of median relative peak frequency (A), bandwidth (B), Q factor (C) and maximum power (D) for contacts inside the seizure onset zone (SOZ contacts) and for contacts outside the seizure onset zone (non-SOZ) per patient for β-γ peaks (peak frequency > 14 Hz (N = 13 patients); γ peaks: peak frequency > 40 Hz (N = 12 patients). Changes of bandwidth, Q factor and maximum power differ significantly between SOZ and non-SOZ contacts for both frequency bands, whereas the peak frequency is similar between SOZ and non-SOZ contacts, but widely differs between patients. Magenta circles: median values for spectral β-γ peaks; green cross: median values for spectral γ peaks. This latter comparison was impossible for patient 9, because no spectral peaks were detected in contacts outside the SOZ. p-values report results of the sign test. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)