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

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Fig. 4. — Level function of cubic difference products. (A) The level of the cubic-difference products at 2f₁ - f₂ and 2f₂ - f₁, for which we computed the arithmetic mean, is here compared to that of the quadratic-summation product f₁ + f₂. The ratio of these two quantities is plotted as a function of the magnitude of the external force for stimulation at resonance (black) and off-resonance (red). (B) Arithmetic-mean level of the two cubic difference products 2f₁ - f₂ and 2f₂ - f₁ (filled circles) and of the two primaries f₁ and f₂ (open circles) at resonance (black) and off-resonance (red) as a function of the stimulus amplitude . Dashed horizontal lines mark noise-floor levels when distortion products first appeared. Data in A and B from the same dataset as that used to plot Fig. 3. (C) For n = 11 cells with f₂/f₁ = 1.08 - 1.15, the arithmetic-mean level of the two cubic difference products was divided by that of the primaries at resonance (black) and off-resonance (red). This relative level is plotted as a function of the stimulus amplitude . The continuous lines correspond to a moving average over a window comprising seven data points. The shaded areas represent 95% confidence intervals.

Inline graphic — Level function of cubic difference products. (A) The level of the cubic-difference products at 2f₁ - f₂ and 2f₂ - f₁, for which we computed the arithmetic mean, is here compared to that of the quadratic-summation product f₁ + f₂. The ratio of these two quantities is plotted as a function of the magnitude of the external force for stimulation at resonance (black) and off-resonance (red). (B) Arithmetic-mean level of the two cubic difference products 2f₁ - f₂ and 2f₂ - f₁ (filled circles) and of the two primaries f₁ and f₂ (open circles) at resonance (black) and off-resonance (red) as a function of the stimulus amplitude . Dashed horizontal lines mark noise-floor levels when distortion products first appeared. Data in A and B from the same dataset as that used to plot Fig. 3. (C) For n = 11 cells with f₂/f₁ = 1.08 - 1.15, the arithmetic-mean level of the two cubic difference products was divided by that of the primaries at resonance (black) and off-resonance (red). This relative level is plotted as a function of the stimulus amplitude . The continuous lines correspond to a moving average over a window comprising seven data points. The shaded areas represent 95% confidence intervals.