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. 2012 May 3;109(21):E1344-E1351. doi: 10.1073/pnas.1202426109

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Fig. 7. — Simulations of two-tone interferences by a critical oscillator. (A) Two-tone suppression. The response at the frequency f₁ = 20 Hz (black) or f₁ = 200 Hz (red) of a test tone is plotted as a function of the amplitude F₁ of this component of the two-tone stimulus for various amplitudes F₂ (•, 0 pN; △, 1 pN; ⧫, 5 pN; ▿, 25 pN) of a masker tone at f₂ = 22 Hz (black) or f₂ = 220 Hz (red). The oscillator displayed a characteristic frequency of spontaneous oscillation f_C = 20.9 Hz. (B) Here F₁ = F₂ = 0.2 pN, the test-tone frequency f₁ = 21 Hz ≅ f_C was fixed while the masker-tone frequency f₂ was varied. The responses at frequencies f₁ (black disks) and f₂ (white disks), as well as the arithmetic-mean level of the cubic difference products at frequencies 2f₁ - f₂ and 2f₂ - f₁ (red disks), are plotted as a function of the frequency separation Δf = f₂ - f₁. (C) Two-tone distortions. The arithmetic-mean level of the cubic difference products is plotted as a function of the stimulus amplitude at resonance (black; f₁ = 20 Hz and f₂ = 22 Hz) and off-resonance (red; f₁ = 200 Hz and f₂ = 220 Hz). (D) The arithmetic-mean level of the two cubic difference products was divided by that of the primaries and plotted as a function of the stimulus amplitude . The system was deterministic, except in C and D (open symbols) where the oscillator was subjected to random noise. Thin blue lines represent power laws (power indicated next to the line). Parameter values: μ = 0, b = 10¹⁷ m^-2·s^-1, Λ = 1·10^-7 N·s·m^-1.

Inline graphic — Simulations of two-tone interferences by a critical oscillator. (A) Two-tone suppression. The response at the frequency f₁ = 20 Hz (black) or f₁ = 200 Hz (red) of a test tone is plotted as a function of the amplitude F₁ of this component of the two-tone stimulus for various amplitudes F₂ (•, 0 pN; △, 1 pN; ⧫, 5 pN; ▿, 25 pN) of a masker tone at f₂ = 22 Hz (black) or f₂ = 220 Hz (red). The oscillator displayed a characteristic frequency of spontaneous oscillation f_C = 20.9 Hz. (B) Here F₁ = F₂ = 0.2 pN, the test-tone frequency f₁ = 21 Hz ≅ f_C was fixed while the masker-tone frequency f₂ was varied. The responses at frequencies f₁ (black disks) and f₂ (white disks), as well as the arithmetic-mean level of the cubic difference products at frequencies 2f₁ - f₂ and 2f₂ - f₁ (red disks), are plotted as a function of the frequency separation Δf = f₂ - f₁. (C) Two-tone distortions. The arithmetic-mean level of the cubic difference products is plotted as a function of the stimulus amplitude at resonance (black; f₁ = 20 Hz and f₂ = 22 Hz) and off-resonance (red; f₁ = 200 Hz and f₂ = 220 Hz). (D) The arithmetic-mean level of the two cubic difference products was divided by that of the primaries and plotted as a function of the stimulus amplitude . The system was deterministic, except in C and D (open symbols) where the oscillator was subjected to random noise. Thin blue lines represent power laws (power indicated next to the line). Parameter values: μ = 0, b = 10¹⁷ m^-2·s^-1, Λ = 1·10^-7 N·s·m^-1.