The physiological basis of the phonologization of vowel nasalization: A 
real-time MRI analysis of American and Southern British English

Cunha, C.; Hoole, P.; Voit, Dirk; Frahm, Jens; Harrington, J.

doi:10.1016/j.wocn.2024.101329

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The physiological basis of the phonologization of vowel nasalization: A real-time MRI analysis of American and Southern British English

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Voit, Dirk
Research Group Biomedical NMR, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society;

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Frahm, Jens
Research Group Biomedical NMR, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society;

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Citation

Cunha, C., Hoole, P., Voit, D., Frahm, J., & Harrington, J. (2024). The physiological basis of the phonologization of vowel nasalization: A real-time MRI analysis of American and Southern British English. Journal of Phonetics, 105: 101329. doi:10.1016/j.wocn.2024.101329.

Cite as: https://hdl.handle.net/21.11116/0000-000F-53BF-D

Abstract

The diachronic change by which coarticulatory nasalization increases in VN (vowel-nasal) sequences has been modelled as an earlier alignment of the velum combined with oral gesture weakening of N. The model was tested by comparing American (USE) and Standard Southern British English (BRE) based on the assumption that this diachronic change is more advanced in USE. Real-time MRI data was collected from 16 USE and 27 BRE adult speakers producing monosyllables with coda /Vn, Vnd, Vnz/. For USE, nasalization was greater in V, less in N, and there was greater tongue tip lenition than for BRE. The dialects showed a similar stability of the velum gesture and a trade-off between vowel nasalization and tongue tip lenition. Velum alignment was not earlier in USE. Instead, a closer approximation of the time of the tongue tip peak velocity towards the tongue tip maximum for USE caused a shift in the acoustic boundary within VN towards N, giving the illusion that the velum gesture has an earlier alignment in USE. It is suggested that coda reduction which targets the tongue tip more than the velum is a principal physiological mechanism responsible for the onset of diachronic vowel nasalization.