Figure 2.

Connectivity networks among the four ROIs used in the present work (dashed red lines and continuous black lines denote inhibitory and excitatory connections, respectively). The network in (A) simulates a possible physiological connectivity from occipital (or thalamic) regions to motor regions and temporal/frontal regions. This network, by varying the strength of a single connection or the input value to a single ROI, was used to obtain the results shown in Figures 6–13 using the functional connectivity (FC) metrics based on Granger causality (but see also Figure S4 in Supplementary Materials part 2 for the other FC metrics). The simple loop network in (B) allows a straightforward analysis of rhythm propagation in a chain of interconnected ROIs; the corresponding results are reported in Supplementary Materials part 2 (Figures S5 and S6).