Figure 4. Constructive effect of independent noise on the coupling of the phase ensemble with multiplicative (state-dependent) coupling update.

(a), Mean synaptic weight (scale on the left vertical axis) and time-averaged order parameters 〈R_STDP〉 and 〈R_Fix〉 (scale on the right vertical axis) for the ensemble with STDP and without STDP (for fixed coupling matrix K_Fix, see Methods), respectively, versus noise strength μ. (b), Normalized histograms of the distribution density of the coupling weights k_ij for the noise intensities μ = 0 (no input, scale on the left vertical axis), μ = 0.125 and μ = 0.5 (scale on the right vertical axis) as indicated in the plot.