Figure 8.

Amplitude of the first three Fourier components of the response, normalized by the average firing rate, ν₀, as a function of the strength of input modulation. Circles, First Fourier component; squares, second Fourier component; diamonds, third Fourier component. Parameters: σ = 6.3 mV; ν₀ = 20 Hz; f = 20 Hz. The first Fourier component, ν₁, is linear in I₁ up to modulations of the firing rate of order ν₀. The higher Fourier components are negligible up to approximately the same amount of modulation. Note that all simulations presented in this study (except in this figure) are done with ν₁ /ν₀ ≈ 0.25, well into the domain of validity of the linear approximation.