| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Second Virtual Pitch Shift in Cochlea Observed In Situ via Laser Interferometry |
| Zhang-Cai Long1†, Yan-Ping Zhang2†, and Lin Luo3* |
1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
2Affiliated Hospital, Huazhong University of Science and Technology, Wuhan 430074, China
3Department of Chinese Language and Literature, Huazhong University of Science and Technology, Wuhan 430074, China
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| Cite this article: |
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Zhang-Cai Long, Yan-Ping Zhang, and Lin Luo 2021 Chin. Phys. Lett. 38 024301 |
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Abstract Pitch is the most important auditory perception characteristic of sound with respect to speech intelligibility and music appreciation, and corresponds to a frequency of sound stimulus. However, in some cases, we can perceive virtual pitch, where the corresponding frequency component does not exist in the stimulating sound. This virtual pitch contains a deviation from the de Boer pitch shift formula, which is known as second pitch shift. It has been theoretically suggested that nonlinear dynamics in the cochlea or in the neural network produce a nonlinear resonance with a frequency corresponding to the virtual pitch; however, there is no direct experimental observation to support this theory. The second virtual pitch shift, expressed via basilar membrane nonlinear vibration temporal patterns, and consistent with psychoacoustic experiments, is observed in situ in the cochlea via laser interferometry.
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Received: 29 August 2020
Published: 27 January 2021
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11374118 and 90820001). |
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