Table 1 EEG/MEG Measures of functional and effective connectivity
From: Electrophysiological insights into connectivity anomalies in schizophrenia: a systematic review
Measure | Description | Altered in ScZ |
|---|---|---|
Coherence | A measure of covariation in the amplitude and/or phase of two neural signals [16] | ●● |
Imaginary Part of Coherence | An estimate of coherence that focuses on time-lagged synchronization [58] | |
Phase-Locking Value | A measures of the covariation in the phase of two neural signals [18] | ●● |
Phase-Lag Index | A measure of the asymmetry of the distribution of phase differences between two signals [59]. | |
Granger Causality | Estimates the direction of neural communication between two time-series through predicting the course of activation in another cortical area [60] | ● |
Transfer Entropy | A method to estimate directed interactions without a priori specification of a model for the data [61] | |
Directed Transfer Function | Comparable method to Granger Causality, but normalized for inflow from all areas [60] | ● |
Mutual Information | Estimation of amount of signal in first area explained by the signal in the second area [62] | ● |
Synchronization Likelihood | Normalized strength of mutual information between signals from two areas [63] | ● |