Figure 6. Individual (within-brain) coherence maps for J2 in the theta and alpha frequency bands and for the four difficulty levels (3, 4, 5 and 6 juggled balls).

The maps are normalized after thresholding to enhance the differences across the retained functional connections. In each coherence map, the electrodes are grouped according to the cortical areas (frontal, central, parietal and occipital), and are listed in the following order from top to bottom and from left to right: “fr” includes the frontal electrodes Fp1, Fpz, Fp2, F7, F3, Fz, F4, F8; “ce” includes the central electrodes FC5, FC1, FC2, FC6, T7, C3, Cz, C4, T8; “pa” includes the parietal electrodes CP5, CP1, CP2, CP6, P7, P3, Pz, P4, P8; “oc” includes the occipital electrodes POz, O1, O2.