Journal
JOURNAL OF BIOMECHANICS
Volume 47, Issue 6, Pages 1270-1277Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2014.02.025
Keywords
Gerbil; Cochlea; Finite element; Sensitivity analysis; Bayesian perspective
Categories
Funding
- National Institute of Health [RO1 DC00029]
- Direct For Computer & Info Scie & Enginr
- Office of Advanced Cyberinfrastructure (OAC) [1148111, 1148124] Funding Source: National Science Foundation
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We describe a method to use point-stiffness (PtSt) measurements, i.e., indentation measurements, to obtain elastic moduli of different organ of Corti (OC) tissues. A detailed finite element (FE) model of the OC is used to account for geometric effects in the indentation measurements. We also present a sensitivity analysis, performed within a Bayesian estimation framework, that can be used to improve experimental design. The sensitivity analysis shows that the basilar membrane (BM) PtSt is most sensitive to changes in the BM properties and to changes in the pillar cells (PC) properties. This result suggests that the BM and the PC dominate the macromechanics of the DC. The most likely values of the Young's modulus predicted for the middle turn for the BM arcuate, BM pectinate, and the PC are found to be 935 KPa (range 640-1360 KPa), 300 KPa (range 190-460 KPa), and 3 GPa (range 1-9 GPa), respectively. (c) 2014 Elsevier Ltd. All rights reserved.
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