Figure 5.

Average combined quality measure 〈Q〉 for different parameter values of the frequency adaptive Hopf oscillator. For every parameter pair of coupling strength ϵ and learning rate η, the average adaption quality measure 〈Q〉 over the logarithmically sampled space of initial intrinsic frequencies f₀ and frequencies of the external signal f_ext is shown (0.1 < f₀, f_ext < 10). The red circles indicate the four cases shown in Figure 4. In each case, the external signal is a sine-wave with unit amplitude.