model of hearing system [hlp]

Hello everyone;
How can I model the hearing system of human? Is there any model in MATLAB?
Please introduce me any book/paper/article/website.

If it were me, I would assume it was a linear system (since sound is seldom loud enough to exceed its dynamic range, and since discrete tones do not generate much in the way of harmonics), and concentrate on is frequency and impulse responses.

biff44 Wrote:
But what is the impulse response of hearing system?