Universal mechanism of low-frequency brain rhythm formation through nonlinear coupling of high-frequency spiking-like activity

A universal mechanism of emergence of synchronized low frequency brain wave field activity is presented as a result of nonlinear coupling with flat frequency neuronal forcing. The mechanism utilizes a unique dispersion properties of weakly-evanescent wave--like brain surface modes that are predicted to exist within a inhomogeneous and anisotropic physical brain tissue model. These surface modes are able to propagate in thin inhomogeneous layers with frequencies that are inverse proportional to w...