Fig. 6

Short pathways exemplified by left hand execution and action observation. Glass brain representation of the 60 ROI WU graphs thresholded at 0.45 show in the upper row short pathways for manipulation left and in the lower row for action observation of the left hand (marked in bold). A detailed summary is given in Table 2. Nodes are color-coded as specified in the legend annotation in Fig. 5. The left column (A) depicts the neuroanatomical context. The middle column (B) shows the associated internal structures of local high functional connectivity converging to the SMA, which is practically identical for both conditions. The right column (C) shows a suggested recursive loop originating at hOc3d in the occipito-parietal transition zone of the right hemisphere and strongly interconnected with subareas IPS hIP3, IPL PGa and PGp, which is functional during motor execution but not during action observation. The size of the nodes reflects the size of participation coefficients in (A) and of strength in the subfields of the (B) and (C). Edges exceeding a weight of 0.6 are color coded; green denotes weights between 0.6 and 0.7, yellow weights between 0.7 and 0.8, blue weights between 0.8 and 0.9, and red weights greater than 0.9.