Bulletin of the American Physical Society
2009 APS March Meeting
Volume 54, Number 1
Monday–Friday, March 16–20, 2009; Pittsburgh, Pennsylvania
Session Y40: Physiological and Medical Physics
8:00 AM–10:48 AM,
Friday, March 20, 2009
Room: 412
Sponsoring
Unit:
DBP
Chair: Krastan Blagoev, National Science Foundation
Abstract ID: BAPS.2009.MAR.Y40.4
Abstract: Y40.00004 : Sound Localization in Lizards: Functioning of a Pressure-Gradient Receiver*
8:36 AM–8:48 AM
Preview Abstract
Abstract
Author:
J. Leo van Hemmen
(Physik Department, TU Muenchen)
Because of their small interaural distance, lizards as well as some other animals have developed a special hearing mechanism, the ``pressure-gradient receiver''. The lizard peripheral auditory system differs from the mammalian one by a coupling of the two eardrums through the internal mouth cavity. We present a three-dimensional analytical model of the pressure-gradient receiver. The central aspect of the coupling of the membranes through the mouth cavity is realized by means of the boundary conditions. Moreover, the lizard's middle ear, a simple lever construction called \textit{columella}, is asymmetrically attached to the tympanic membrane. This has motivated us to solve the problem of how the middle ear influences the spatial-amplitude profile and the frequency distribution of the tympanic membrane vibration. Finally, we show results from numerical simulations of the eigenfunctions and eigenfrequencies in a lizard's internal mouth cavity bounded by the eardrums. To this end, we have constructed the complex geometry from a cast imprint of the cavity with the help of three-dimensional scans. Our results led to an interesting speculation regarding the neurobiological use of the pressure-gradient system.
*Work done in collaboration with C. Vossen. Partially supported by BCCN-Munich.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.Y40.4
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