Table 1:

A comparison of the three connectivity measures in Figure 4.

Tetrodes	Connectivity measures
	Coherence	Partial coherence	Partial directed coherence
1 and 2	${\rho }_{12}^2(\omega )={\rho }_{21}^2(\omega )\ne 0$	${\zeta }_{12}^2(\omega )={\zeta }_{21}^2(\omega )\ne 0$	${\pi }_{12}^2(\omega )=0$
			${\pi }_{21}^2(\omega )\ne 0$
2 and 3	${\rho }_{23}^2(\omega )={\rho }_{32}^2(\omega )\ne 0$	${\zeta }_{23}^2(\omega )={\zeta }_{32}^2(\omega )\ne 0$	${\pi }_{23}^2(\omega )=0$
			${\pi }_{32}^2(\omega )\ne 0$
3 and 1	${\rho }_{31}^2(\omega )={\rho }_{13}^2(\omega )\ne 0$	${\zeta }_{31}^2(\omega )={\zeta }_{13}^2(\omega )=0$	${\pi }_{31}^2(\omega )=0$
			${\pi }_{13}^2(\omega )=0$