Fig. 5: Global delta waves emerge for strong coupling.
From: Metastable oscillatory modes emerge from synchronization in the brain spacetime connectome
a The simulated signals in all 90 units plotted over 25 s, each representing a brain area from a brain parcellation template, filtered below 30 Hz to focus on the sub-gamma oscillatory activity typically detected with magnetoencephalography (MEG). Shades highlight the time points of increased power in the delta (yellow), theta (red), alpha (blue) and beta (green) frequency bands. For each frequency band, the threshold was defined as five standard deviations (STD) from the amplitude in the same frequency bands when no delays were considered. These simulations were performed setting the resonant frequency of all units ω0 = 40 Hz, the average delay between units, 〈τ〉 = 3 milliseconds (ms) and the global coupling strength was increased to K = 50 with respect to the simulations shown in Fig. 4. b The mean amplitude envelope (blue) of the filtered signals shown in (a) correlates with r = 0.8247 with the phase synchronization evaluated by the Kuramoto Order parameter (orange, right y-axis).
