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Communication Dans Un Congrès Année : 2020

Bone Conduction and Sound Localization by Dolphins: A Numerical Model

Résumé

Compared to other mammals, dolphins are known to have a striking ability in localizing a sound source with equal sensitivity to changes in elevation and azimuth. Considering the fact that these animals have lost their pinnae, their sound localization system is presumably different from those found in terrestrial mammals, including humans. The contribution of their anatomy to sound localization remains an open question. We investigate how waves reverberating through the skull of dolphins could impact their ability to localize a sound source in the vertical plane. Specifically, we study the propagation of elastic waves in the skull of a dolphin via a numerical approach. We employed the k- Wave(1) software to simulate elastic-wave propagation in a 3D model built from a computed tomography scan of a short-beaked dolphin skull (scalar grayscale was converted into elastic parameters). By illuminating the skull from various angles in the vertical plane, we first validated the reliability of the resulting images of elastic properties by comparing the arrival time of our signals with the results from a laboratory experiment, that our team previously conducted on the same skull. We next investigated the contribution of the bone-reverberated waves by evaluating the correlation between the signals received from different angles. Similar to the results of the mentioned experiment, we find that the reverberated "coda" of received signals is essential to enable precise sound localization: when only direct arrivals are taken into account, localization is significantly less accurate. (1) http://www.k-wave.org/
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Dates et versions

hal-03230822 , version 1 (26-05-2021)

Identifiants

Citer

Aida Hejazi Nooghabi, Quentin Grimal, Michael Reinwald, Anthony Herrel, Lapo Boschi. Bone Conduction and Sound Localization by Dolphins: A Numerical Model. Forum Acusticum, Dec 2020, Lyon, France. pp.2397-2397, ⟨10.48465/fa.2020.0943⟩. ⟨hal-03230822⟩
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