Figure 1
From: Assessing performance of directed functional connectivity measures in the presence of common source
A. Directionalities of five directed connectivity measures under the volume conduction effect. Positive Directionality Index (DI) implies correct directionality of information flow. As M (mixing ratio) increases, the DIs of GC, STE and PSI decrease. However, as expected in analytic calculation, the dPLI and dWPLI are not affected. (DI is defined as a normalized information flow.) B. Directionalities of five directed connectivity measures under the common noise effect. As M (noise-to-signal ratio) increases, the DIs' signs of GC, STE and PSI change while those of dPLI and dWPLI do not.