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2018 | OriginalPaper | Buchkapitel

Dynamic Acoustic Evidence of Nasalization as a Compensatory Mechanism for Voicing in Spanish Apraxic Speech

verfasst von : Anna K. Marczyk, Yohann Meynadier, Yulia Gaydina, Maria-Josep Solé

Erschienen in: Studies on Speech Production

Verlag: Springer International Publishing

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Abstract

This paper is concerned with the phonetic realization of the voicing contrast by two Spanish speakers with surgery-related apraxia of speech and two matched control speakers. Specifically, it examines whether speakers with AOS, widely reported to have a deficit in laryngeal control, use nasal leak as a compensatory mechanism aimed at facilitating the initiation of voicing in word-initial stops. The results show that the two apraxic speakers produced prevoicing in /b d g/ in only one third of the cases (correctly identified as ‘voiced’). In these cases, however, they exhibited significantly longer prevoicing than control subjects, and this longer voiced portion was closely related to a longer nasal murmur. These results shed light on the compensation strategies used by apraxic subjects to achieve voicing. Differences in the intensity patterns of nasal and voiced stops indicate that apraxic speakers control the timing of velopharyngeal gesture, suggesting that apraxia is a selective impairment.

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Vorheriges Kapitel Acoustic Analysis of Mandarin Speech in Parkinson’s Disease with the Effects of Levodopa

It is well known that Spanish /b d g/ are typically produced with voicing lead (‘pre-voicing’) such that the onset of vocal fold vibration precedes the release of the stop, resulting in negative VOT values, while /p t k/ are produced with a near-simultaneous release and onset of laryngeal vibration, resulting in VOT values that are approximately zero [10, 11]. Voiceless stops are phonetically realized as stops, i.e., with a complete oral closure, in all contexts. By contrast, voiced /b d g/ are realized as stops utterance-initially, after a nasal, or after [l] in the case of /d/, and systematically realized as approximants in all other contexts, for example, between vowels or after a continuant.

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Titel: Dynamic Acoustic Evidence of Nasalization as a Compensatory Mechanism for Voicing in Spanish Apraxic Speech
verfasst von: Anna K. Marczyk
Yohann Meynadier
Yulia Gaydina
Maria-Josep Solé
Verlag: Springer International Publishing
Buch: Studies on Speech Production
Print ISBN: 978-3-030-00125-4

Electronic ISBN: 978-3-030-00126-1

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-030-00126-1_20

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