References
- Allison, K. M., Annear, L., Policicchio, M., & Hustad, K. C. (2017). Range and precision of formant movement in pediatric dysarthria. Journal of Speech, Language, and Hearing Research, 60(7), 1864–1876. https://doi.org/10.1044%2F2017_jslhr-s–15–0438
- Bradlow, A. R., Torretta, G. M., & Pisoni, D. B. (1996). Intelligibility of normal speech I: Global and fine-grained acoustic-phonetic talker characteristics. Speech Communication, 20(3–4), 255–272. https://doi.org/10.1016/S0167-6393(96)00063-5
- Brady, M. C., Clark, A. M., Dickson, S., Paton, G., & Barbour, R. S. (2011). The impact of stroke-related dysarthria on social participation and implications for rehabilitation. Disability and Rehabilitation, 33(3), 178–186. https://doi.org/10.3109/09638288.2010.517897
- Chen, F., Wong, L. L., & Wong, E. Y. (2013). Assessing the perceptual contributions of vowels and consonants to Mandarin sentence intelligibility. The Journal of the Acoustical Society of America, 134(2), EL178–EL184. https://doi.org/10.1121/1.4812820
- Connaghan, K. P., & Patel, R. (2017). The impact of contrastive stress on vowel acoustics and intelligibility in dysarthria. Journal of Speech, Language, and Hearing Research, 60(1), 38–50. https://doi.org/10.1044/2016_JSLHR-S-15-0291
- Darley, F. L., Aronson, A. E., & Brown, J. R. (1969a). Clusters of deviant speech dimensions in the dysarthrias. Journal of Speech and Hearing Research, 12(3), 462–496. https://doi.org/10.1044/jshr.1203.462
- Darley, F. L., Aronson, A. E., & Brown, J. R. (1969b). Differential diagnostic patterns of dysarthria. Journal of Speech and Hearing Research, 12(2), 246–269. https://doi.org/10.1044/jshr.1202.246
- Duffy, J. R. (2013). Motor speech disorders: Substrates, differential diagnosis, and management (3rd ed.). Elsevier.
- Feigin, V. L., Krishnamurthi, R. V., Parmar, P., Norrving, B., Mensah, G. A., Bennett, D. A., … Truelsen, T. (2015). Update on the global burden of ischemic and hemorrhagic stroke in 1990-2013: The GBD 2013 study. Neuroepidemiology, 45(3), 161–176. https://doi.org/10.1159/000441085
- Fitch, W. T., & Giedd, J. (1999). Morphology and development of the human vocal tract: A study using magnetic resonance imaging. The Journal of the Acoustical Society of America, 106(3), 1511–1522. https://doi.org/10.1121/1.427148
- Fletcher, A. R., McAuliffe, M. J., Lansford, K. L., & Liss, J. M. (2017). Assessing vowel centralization in dysarthria: A comparison of methods. Journal of Speech, Language, and Hearing Research, 60(2), 341–354. https://doi.org/10.1044/2016_JSLHR-S-15-0355
- Flowers, H. L., Silver, F. L., Fang, J., Rochon, E., & Martino, R. (2013). The incidence, co-occurrence, and predictors of dysphagia, dysarthria, and aphasia after first-ever acute ischemic stroke. Journal of Communication Disorders, 46(3), 238–248. https://doi.org/10.1016/j.jcomdis.2013.04.001
- Howie, J. M. (1974). On the domain of tones in Mandarin. Phonetica, 30(3), 129–148. https://doi.org/10.1159/000259484
- Karlsson, F., & Doorn, J. (2012). Vowel formant dispersion as a measure of articulation proficiency. The Journal of the Acoustical Society of America, 132(4), 2633–2641. https://doi.org/10.1121/1.4746025
- Kent, R. D., & Kim, Y. J. (2003). Toward an acoustic typology of motor speech disorders. Clinical Linguistics & Phonetics, 17(6), 427–445. https://doi.org/10.1080/0269920031000086248
- Kent, R. D., & Vorperian, H. K. (2018). Static measurements of vowel formant frequencies and bandwidths: A review. Journal of Communication Disorders, 74, 74–97. https://doi.org/10.1016%2Fj.jcomdis.2018.05.004
- Kim, H., Gao, S., Yi, B., Shi, R., Wan, Q., & Huang, Z. (2019). Validation of the dysphonia severity index in the Dr. Speech program. Journal of Voice, 33(6), e923–948. e929. https://doi.org/10.1016/j.jvoice.2019.08.011
- Kim, H., Hasegawa, -J. M., & Perlman, A. (2011). Vowel contrast and speech intelligibility in dysarthria. Folia Phoniatrica Et Logopaedica, 63(4), 187–194. https://doi.org/10.1159/000318881
- Kim, Y., Kent, R. D., & Weismer, G. (2011). An acoustic study of the relationships among neurologic disease, dysarthria type, and severity of dysarthria. Journal of Speech, Language, and Hearing Research, 54(2), 417–430. https://doi.org/10.1044/1092-4388(2010/10-0020)
- Kuo, C., & Tjaden, K. (2016). Acoustic variation during passage reading for speakers with dysarthria and healthy controls. Journal of Communication Disorders, 62, 30–44. https://doi.org/10.1016/j.jcomdis.2016.05.003
- Lansford, K. L., & Liss, J. M. (2014). Vowel acoustics in dysarthria: Speech disorder diagnosis and classification. Journal of Speech, Language, and Hearing Research, 57(1), 57–69. https://doi.org/10.1044/1092-4388(2013/12-0262)
- Lindblom, B. (1963). Spectrographic study of vowel reduction. The Journal of the Acoustical Society of America, 35(11), 1773–1781. https://doi.org/10.1121/1.1918816
- Liu, H.-M., Tsao, F.-M., & Kuhl, P. K. (2005). The effect of reduced vowel working space on speech intelligibility in Mandarin-speaking young adults with cerebral palsy. The Journal of the Acoustical Society of America, 117(6), 3879–3889. https://doi.org/10.1121/1.1898623
- Mefferd, A. S. (2017). Tongue-and jaw-specific contributions to acoustic vowel contrast changes in the diphthong/ai/in response to slow, loud, and clear speech. Journal of Speech, Language, and Hearing Research, 60(11), 3144–3158. https://doi.org/10.1044/2017_JSLHR-S-17-0114
- Mou, Z., Chen, Z., Yang, J., & Xu, L. (2018). Acoustic properties of vowel production in Mandarin-speaking clients with post-stroke dysarthria. Scientific Reports, 8(1), 1–12. https://doi.org/10.1038/s41598-018-32429-8
- Mou, Z., Teng, W., Ouyang, H., Chen, Y., Liu, Y., Jiang, C., Chen, Y., Zhang, J., & Chen, Z. (2019). Quantitative analysis of vowel production in cerebral palsy children with dysarthria. Journal of Clinical Neuroscience, 66, 77–82. https://doi.org/10.1016/j.jocn.2019.05.020
- Murray, C. J., Vos, T., Lozano, R., Naghavi, M., Flaxman, A. D., Michaud, C., Shibuya, K., Salomon, J. A., Abdalla, S., Aboyans, V., Abraham, J., Ackerman, I., Aggarwal, R., Ahn, S. Y., Ali, M. K., AlMazroa, M. A., Alvarado, M., Anderson, H. R., Anderson, L. M., Lopez, A. D., & Ezzati, M. (2012). Disability-adjusted life years (DALYs) for 291 diseases and injuries in 21 regions, 1990–2010: A systematic analysis for the global burden of disease study 2010. The Lancet, 380(9859), 2197–2223. https://doi.org/10.1016/S0140-6736(12)61689-4
- Neel, A. T. (2008). Vowel space characteristics and vowel identification accuracy. Journal of Speech, Language, and Hearing Research, 51(3), 574–585. https://doi.org/10.1044/1092-4388(2008/041)
- Patel, R., Connaghan, K., Franco, D., Edsall, E., Forgit, D., Olsen, L., Ramage, L., Tyler, E., & Russell, S. (2013). “The Caterpillar”: A novel reading passage for assessment of motor speech disorders. American Journal of Speech-Language Pathology, 22(1), 1–9. https://doi.org/10.1044/1058-0360(2012/11-0134)
- Rosen, K. M., Goozée, J. V., & Murdoch, B. E. (2008). Examining the effects of multiple sclerosis on speech production: Does phonetic structure matter? Journal of Communication Disorders, 41(1), 49–69. https://doi.org/10.1016/j.jcomdis.2007.03.009
- Roy, N., Nissen, S. L., Dromey, C., & Sapir, S. (2009). Articulatory changes in muscle tension dysphonia: Evidence of vowel space expansion following manual circumlaryngeal therapy. Journal of Communication Disorders, 42(2), 124–135. https://doi.org/10.1016/j.jcomdis.2008.10.001
- Rusz, J., Cmejla, R., Tykalova, T., Ruzickova, H., Klempir, J., Majerova, V., … Ruzicka, E. (2013). Imprecise vowel articulation as a potential early marker of Parkinson’s disease: Effect of speaking task. The Journal of the Acoustical Society of America, 134(3), 2171–2181. https://doi.org/10.1121/1.4816541
- Sapir, S., Ramig, L. O., Spielman, J., & Fox, C. (2011). Acoustic metrics of vowel articulation in Parkinson’s disease: Vowel space area (VSA) vs. vowel articulation index (VAI). Paper presented at the MAVEBA, Florence, Italy.
- Sapir, S., Ramig, L. O., Spielman, J. L., & Fox, C. (2010). Formant centralization ratio: A proposal for a new acoustic measure of dysarthric speech. Journal of Speech, Language, and Hearing Research, 53(1), 114–125. https://doi.org/1092-4388(2009/08-0184)
- Sapir, S., Spielman, J. L., Ramig, L. O., Story, B. H., & Fox, C. (2007). Effects of intensive voice treatment (the Lee Silverman voice treatment [LSVT]) on vowel articulation in dysarthric individuals with idiopathic Parkinson disease: Acoustic and perceptual findings. Journal of Speech, Language, and Hearing Research, 50(4), 899–912. https://doi.org/doi:10.1044/1092-4388(2007/064
- Skodda, S., Visser, W., & Schlegel, U. (2011). Vowel articulation in Parkinson’s disease. Journal of Voice, 25(4), 467–472. https://doi.org/10.1016/j.jvoice.2010.01.009
- Stevens, K. N. (1998). Acoustic phonetics. MIT press.
- Tjaden, K., Lam, J., & Wilding, G. (2013). Vowel acoustics in Parkinson’s disease and multiple sclerosis: Comparison of clear, loud, and slow speaking conditions. Journal of Speech, Language, and Hearing Research, 56(5), 1485–1502. https://doi.org/10.1044/1092-4388(2013/12-0259)
- Tomik, B., & Guiloff, R. J. (2010). Dysarthria in amyotrophic lateral sclerosis: A review. Amyotrophic Lateral Sclerosis, 11(1–2), 4–15. https://doi.org/10.1080%2F17482960802379004
- Turner, G. S., Tjaden, K., & Weismer, G. (1995). The influence of speaking rate on vowel space and speech intelligibility for individuals with amyotrophic lateral sclerosis. Journal of Speech, Language, and Hearing Research, 38(5), 1001–1013. https://doi.org/10.1044/jshr.3805.1001
- Wan, I.-P., & Jaeger, J. J. (2003). The phonological representation of Taiwan Mandarin vowels: A psycholinguistic study. Journal of East Asian Linguistics, 12(3), 205–257. https://doi.org/10.1023/A:1023666819363
- Wang, H., & Heuven, V. (2006). Acoustical analysis of English vowels produced by Chinese, Dutch and American speakers. Linguistics in the Netherlands, 23(1), 237–248.https://doi.org/10.1075%2Favt.23.23wan
- Wong, L.-H., & Wong, J. W.-S. (2018). The underlying prosody of stress and tone. Contemporary Linguistics, 20(1), 85–102.
- Yang, Y., & Chen, Y. (2018). Effects of entering tone on vowel duration and formants in Nanjing dialect. Lecture Notes in Computer Science, 146–157. https://doi.org/10.1007%
- Yunusova, Y., Weismer, G., Westbury, J. R., & Lindstrom, M. J. (2008). Articulatory movements during vowels in speakers with dysarthria and healthy controls. Journal of Speech, Language, and Hearing Research, 51(3), 596–611. https://doi.org/10.1044/1092-4388(2008/043)