Fig. 2: Long-range synchronization of high-frequency oscillations.
From: Long-range phase synchronization of high-frequency oscillations in human cortex
a Mean phase synchronization, as measured with the phase-locking value (PLV) and b imaginary PLV (iPLV) between all pairs of cWM-referenced SEEG contacts in distance-range quartiles (92,011 contact pairs in each quartile; very-short: < 32 mm; short: 32–45 mm; medium: 45–60 mm; long: 60–137 mm. Dashed lines are the 99.9th%-ile of surrogate data (Nrandomizations = 100). Shaded areas are the 2.5–97.5%-ile bootstrap confidence-limits of the mean PLV/iPLV (Nbootstraps = 100)). c Mean phase synchronization among bipolar-referenced SEEG contacts. d Phase synchronization between SEEG contacts in saline solution (red lines, synchronization spectra from a are shown in gray for comparison). e Examples of significant (p < 0.001) long-range HFO synchronization with non-zero and f near-zero phase lags (ϕ) from two subjects (MFG middle frontal gyrus, azure traces and gray-matter contacts in MRI insets, IPS intra-parietal sulcus, red; black circles in MRI insets mark the white-matter reference channels).
