Mechanically equivalent system for Neely and Kim’s 1986 model [19], in which and represent the transverse mass and stiffness of the BM and organ of Corti, and and represent the transformed effect of the radial motion of the tectorial membrane, TM. The model thus has two degrees of freedom. The active pressure due to the outer hair cells, , is assumed to be proportional to the difference in the displacement and velocity of and via the impedance, , and cochlear amplifier gain, .
