## 2aPP26. Mechanical cochlear-partition parameter variation in a box-cochlea model.

### Session: Tuesday Morning, December 3

### Time:

**Author: Timothy A. Wilson**

**Location: Dept. of Elec. Eng., Univ. of Memphis, Memphis, TN 38152**

**Abstract:**

Place and frequency responses were determined for one-, two-, and
three-dimensional fluid motion in a box-cochlea model with a
stiffness-damping-mass cochlear-partition representation having exponentially
decreasing stiffness, exponentially varying damping, and constant mass densities
per unit length. The rational-function frequency-domain impedance for that
partition model was represented as a function of a single variable, the
generalized cochlear place, a linear combination of cochlear place, and the
logarithm of stimulus frequency. When cochlear mass density was relatively
large, the best generalized cochlear place was a constant, with the result that
the slope of the linear best (ordinary) place versus log-frequency graph
depended only on the rate of partition stiffness decrease; in that case, three
orders of magnitude of presented stimulus frequency mapped best places over the
entire cochlear length only when the stiffness changed by six orders of
magnitude. When cochlear mass density was relatively small, the slope of best
generalized place versus log frequency could be made more negative for the same
stiffness rate, and the same range of best-place versus frequency variation was
achieved with less stiffness change along the cochlear length.

ASA 132nd meeting - Hawaii, December 1996