Figure 3.

Recovering Balance by Homeostatic Inhibitory Plasticity

Results of inhibitory (Inh) plasticity. We initialize a heterogeneous network with CV_K = 0.15 and zero in-degree correlations.

(A) 3D scatterplot of the in-degrees of excitatory (Exc) neurons from each of the three populations (Exc, Inh, VPM). Left: initial. Right: After plasticity, correlations have increased such that the functional in-degrees are coplanar. Gray shadow is the projection of the in-degrees in the Exc-VPM plane, which is unchanged throughout plasticity.

(B) Functional imbalance (defined in the Supplemental Information) decreases throughout the plasticity session and reaches a steady state that is less than $1/\sqrt{K}$ (red dashed line).

(C) Sample raster plot after plasticity reveals irregular firing.

(D) Rate histogram shows network has recovered reasonable rate distribution, with nearly all neurons active.