Chunk #28 — 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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where Xi(f) and Xj(f) are the Fourier transforms of xi(t) and xj(t), respectively, (∙)* denotes the complex conjugate, and 〈∙〉 denotes the expectation value. The latter is usually evaluated as the average across a sufficiently large number of signal realizations (or segments) under ergodicity assumption.