Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In Vivo
The discovery that an apparent forward-propagating otoacoustic emission (OAE) induced basilar membrane vibration has created a serious debate in the field of cochlear mechanics. The traditional theory predicts that OAE will propagate to the ear canal via a backward traveling wave on the basilar memb...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Neural Plasticity |
| Online Access: | http://dx.doi.org/10.1155/2018/7502648 |
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| author | Fangyi Chen Dingjun Zha Xiaojie Yang Allyn Hubbard Alfred Nuttall |
| author_facet | Fangyi Chen Dingjun Zha Xiaojie Yang Allyn Hubbard Alfred Nuttall |
| author_sort | Fangyi Chen |
| collection | DOAJ |
| description | The discovery that an apparent forward-propagating otoacoustic emission (OAE) induced basilar membrane vibration has created a serious debate in the field of cochlear mechanics. The traditional theory predicts that OAE will propagate to the ear canal via a backward traveling wave on the basilar membrane, while the opponent theory proposed that the OAE will reach the ear canal via a compression wave. Although accepted by most people, the basic phenomenon of the backward traveling wave theory has not been experimentally demonstrated. In this study, for the first time, we showed the backward traveling wave by measuring the phase spectra of the basilar membrane vibration at multiple longitudinal locations of the basal turn of the cochlea. A local vibration source with a unique and precise location on the cochlear partition was created to avoid the ambiguity of the vibration source in most previous studies. We also measured the vibration pattern at different places of a mechanical cochlear model. A slow backward traveling wave pattern was demonstrated by the time-domain sequence of the measured data. In addition to the wave propagation study, a transmission line mathematical model was used to interpret why no tonotopicity was observed in the backward traveling wave. |
| format | Article |
| id | doaj-art-42ebbdb8e208432ea2e98930d34e6716 |
| institution | DOAJ |
| issn | 2090-5904 1687-5443 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Neural Plasticity |
| spelling | doaj-art-42ebbdb8e208432ea2e98930d34e67162025-08-20T02:39:18ZengWileyNeural Plasticity2090-59041687-54432018-01-01201810.1155/2018/75026487502648Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In VivoFangyi Chen0Dingjun Zha1Xiaojie Yang2Allyn Hubbard3Alfred Nuttall4Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, ChinaOregon Hearing Research Center, Department of Otolaryngology and Head and Neck Surgery, Oregon Health and Science University, Portland, OR 97239, USADepartment of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, ChinaDepartment of Electrical & Computer Engineering, Boston University, Boston, MA 02215, USAOregon Hearing Research Center, Department of Otolaryngology and Head and Neck Surgery, Oregon Health and Science University, Portland, OR 97239, USAThe discovery that an apparent forward-propagating otoacoustic emission (OAE) induced basilar membrane vibration has created a serious debate in the field of cochlear mechanics. The traditional theory predicts that OAE will propagate to the ear canal via a backward traveling wave on the basilar membrane, while the opponent theory proposed that the OAE will reach the ear canal via a compression wave. Although accepted by most people, the basic phenomenon of the backward traveling wave theory has not been experimentally demonstrated. In this study, for the first time, we showed the backward traveling wave by measuring the phase spectra of the basilar membrane vibration at multiple longitudinal locations of the basal turn of the cochlea. A local vibration source with a unique and precise location on the cochlear partition was created to avoid the ambiguity of the vibration source in most previous studies. We also measured the vibration pattern at different places of a mechanical cochlear model. A slow backward traveling wave pattern was demonstrated by the time-domain sequence of the measured data. In addition to the wave propagation study, a transmission line mathematical model was used to interpret why no tonotopicity was observed in the backward traveling wave.http://dx.doi.org/10.1155/2018/7502648 |
| spellingShingle | Fangyi Chen Dingjun Zha Xiaojie Yang Allyn Hubbard Alfred Nuttall Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In Vivo Neural Plasticity |
| title | Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In Vivo |
| title_full | Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In Vivo |
| title_fullStr | Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In Vivo |
| title_full_unstemmed | Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In Vivo |
| title_short | Hydromechanical Structure of the Cochlea Supports the Backward Traveling Wave in the Cochlea In Vivo |
| title_sort | hydromechanical structure of the cochlea supports the backward traveling wave in the cochlea in vivo |
| url | http://dx.doi.org/10.1155/2018/7502648 |
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