Figure 4.

Time evolution of the average effective excitatory (violet) and inhibitory (green) synaptic weights ${\overline{w}}^{(exc)}$ and ${\overline{w}}^{(inh)}$, as defined by (6). The network contains 320 and 80 excitatory and inhibitory neurons. Also shown is the average balanced weight (red, enlarged in the insets), given by $4{\overline{w}}^{(exc)}+{\overline{w}}^{(inh)}$. Left: With short-term plasticity. Right: Without short-term plasticity, namely for φ_j ≡ 1 and u_j ≡ 1.