Chunk #27 — Methods to Assess Brain Connectivity Based on Phase Coupling — Frequency-Specific Phase Coupling Methods — Univariate Methods

Source

Brain Functional Connectivity Through Phase Coupling of Neuronal Oscillations: A Perspective From Magnetoencephalography.

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Let us denote by xi(t) and xj(t) the time series of the signals i and j, which can be, e.g., the estimated activities of two distinct elementary sources. The cross-spectrum between two signals i and j at a given frequency f is defined as