Table 1.

The equations of the used functional connectivity measures. For each functional connectivity measure, it is indicated whether they observe associations between signals based on amplitude (A), phase (P) or both (A/P)

Measure		Equation
1. Coherency	A/P	$c=\frac{〈A_1{A}_2{e}^{i∆\phi }〉}{\sqrt{〈A_1^2〉〈A_2^2〉}}$
2. Phase locking value/phase coherence	P	$R=\left|〈e^{i∆{\phi }_{\mathit{ij}}\left(t\right)}〉\right|=\left|\frac{1}{N}\sum _{k=0}^{N-1}{e}^{i∆\phi \left(t_k\right)}\right|$
3. Amplitude envelope	A	$A\left(t\right)=\sqrt{{\left[x\left(t\right)\right]}^2+{\left[\tilde{x}\left(t\right)\right]}^2}$
4. Imaginary coherence	A/P	$\mathit{Im}\left\{c\right\}=\frac{〈A_1{A}_{2}s\text{in}∆\phi 〉}{\sqrt{〈A_1^2〉〈A_2^2〉}}$
5. Phase lag index	P	PLI = |〈sign[sin(∆φ(tk))]〉|
6. Weighted phase lag index	P	$\text{wPLI}\equiv \frac{\mid E\left\{\mathfrak{I}\left(Z\right)\right\}\mid }{\mathrm{E}\left\{\mathfrak{I}\left(\mathrm{Z}\right)\right\}}=\frac{\mid E\left\{\left|\mathfrak{I}\left(Z\right)\right|\mathit{sign}\left(\mathfrak{I}\left(Z\right)\right)\right\}\mid }{E\left\{\left|\mathfrak{I}\left(Z\right)\right|\right\}}$