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Multivariate blockwise Granger causality (BGC) is used to reflect causal interactions among blocks of multivariate time series. Especially, spectral BGC and conditional spectral BGC is used to disclose blockwise causal flow among different brain areas in variant frequencies. In this paper, we demonstrate that (i) BGC in time domain may not disclose true causality at all. (ii) Due to the use of the...
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