Figure 2 illustrates, for a representative couple of subjects, the hyper-brain networks associated to the pure strategies CC, DD, and TT, in the Alpha (8–13 Hz) frequency band. Each network consists of twelve nodes representing the six specific ROIs considered in this study for each subjects' brain. Note that the selected ROIs are the same for each player. To highlight the inter-brain connectivity, only links between the two brains are illustrated in the figure. The grand-average of the hyper-brain networks associated to all the six possible strategies is also reported in Figure S1.
