Bivariate Granger causality vs. Bivariate Granger causality (Spectral)

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Hello. Could you, please, explain what's the exact difference between Bivariate Granger causality and Bivariate Granger causality (Spectral)? Not sure which one of them I should use.

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The spectral version assesses Granger causality in the frequency domain. The other one performs this modeling in the time domain.

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https://neuroimage.usc.edu/brainstorm/Tutorials/Connectivity2#Granger_causality

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