Abstract
Basilar membrane (BM) velocity and Organ of Corti (OC) impedance from a physiologically-based gerbil cochlea model are calculated. The model includes the three-dimensional (3-D) viscous fluid and the pectinate zone of the elastic orthotropic BM with dimensional and material property variation along its length. Active process is represented by adding the motility of the outer hair cells (OHCs) to the passive model with the feed-forward approximation of the OC. The intracochlear pressure is computed by adding the fast wave to the slow traveling wave. A WKB (Wentzel-Kramers-Brillouin) asymptotic and numerical method combined with Fourier series expansions is used to provide a fast and efficient iterative procedure which requires about one second for obtaining the BM response for a given frequency. The current 3-D model provides a realistic model for explaining recent observations including: (1) matching CF to place map, (2) derived BM velocity, and (3) the OC impedance.
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