Figure 4

(a) GC is highly related to the combination between types of projection. For a fixed value of excitation, a moderate increase of the inhibitory conductance (between 3 and 4 nS) suppresses the functional connectivity, while for higher values (from 5 to 8 nS) it raises again, likely reflecting a competition between excitation and inhibition in the link. (b) The sGC ratio reveals the balance between excitation and inhibition, with a working zone of linear correlation (from 2 nS to 4.5 nS). The progressive increase of the inhibition counterbalances the excitation and minimizes the GC, until it dominates the link (from 5 to 8 nS) and enhances the functional connectivity. Note how for common values of GC (black arrows), the sGC perfectly differentiates both conditions.