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. 2008 Nov 17;105(48):18669–18674. doi: 10.1073/pnas.0805752105

Fig. 3.

Fig. 3.

Sensitivity of coupled hair bundles for periodic forcing. (A and B) Linear response (sensitivity at weak forcing) of the central hair bundle for various system sizes as indicated. Forcing amplitudes are F = 0.1 pN for 1 × 1, F = 0.05 pN for 3 × 3, 4 × 4, F = 0.025 pN for 6 × 6, F = 0.01 pN for 9 × 9. (A) Linear response to a stimulus tuned to the frequency of spontaneous oscillations (fs = f0) vs. coupling strength K. (B) Linear response vs. frequency detuning fs − f0. (Inset) Same data with maxima normalized to 1. (C) Nonlinear response as represented by the sensitivity vs. forcing amplitude F. (D) Amplification gain as a function of the total number of hair bundles (boundary conditions as indicated). In B and C, the coupling strength K is chosen such that the quality of spontaneous oscillations is maximal (K = 0.45 mN·m−1 for 3 × 3 and 4 × 4, K = 0.32 mN·m−1 for 6 × 6, K = 0.28 mN·m−1 for 9 × 9). The dashed line in C indicates a power law for comparison. The dashed line in A marks the passive stiffness KSP of an individual hair bundle.