Fig. 6.

The structure of the BM impedance matrix in the case of symmetrical longitudinal coupling (a) as illustrated in Fig. 5 (a), and feedforward action in the organ of Corti (b), as illustrated in Fig. 5 (b), together with the longitudinal distribution of BM admittance corresponding to the velocity distribution along the cochlea when forced at a single point, given by a column of Y_BM = Z_BM⁻¹. In the longitudinal coupling case, Z_L is assumed to be 10% of Z_BM at each location, whereas a value of 50% is assumed for the feedforward case to more clearly show the effect.