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. Author manuscript; available in PMC: 2013 Dec 20.
Published in final edited form as: Neuron. 2012 Dec 20;76(6):1071–1077. doi: 10.1016/j.neuron.2012.10.018

Figure 4.

Figure 4

The synergies underlying the microstimulation-evoked muscle activity were represented non-uniformly over the cortical surface. In each panel, the gray bar plot at right reprints one of the seven (monkey G1) or six (G2) synergies that explained ≥95% of the variance among the ICMS-evoked EMG vectors. In the topographical plots to the left of each bar plot, black (MI) and gray (PMd/v) circles represent stimulation sites (as in Figure 1A). The size of each circle indicates the degree to which the site’s evoked EMG activity was composed of the synergy shown at right. (Specifically, the area of each circle is proportional to the scaling coefficient used in reconstructing the ICMS-evoked EMG vectors at that site and with that synergy, averaged over ICMS trains and normalized by the largest such circle within the plot.) Filled circles indicate locations with associated coefficients significantly larger than would be consistent with a uniform representation of the synergies.