Figure 2.

Open probability of the MET channel, P₀, as a function of the HB deflection, u_hb/rl, at the 16 kHz BP modeled as a first-order Boltzmann function. The slope of the probability function is given by P₀(1_P0)/(ΔX). The open probability is equal to 0.5 when u_hb/rl = X₀. To predict even-order harmonic distortion and a DC shift toward the scala vestibuli, we chose the resting probability, $P_0^s$, to be different from 0.5, using a nonzero value for X₀ (so that the second derivative of the probability with respect to the HB displacement is nonzero when u_hb/rl = 0).