Kristin J Teplansky, Alan Wisler, Lisa Goffman, Jun Wang
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引用次数: 0
Abstract
Purpose: This study aimed to investigate the effect of stimulus signal length on tongue and lip motion pattern stability in speakers diagnosed with amyotrophic lateral sclerosis (ALS) compared to healthy controls.
Method: Electromagnetic articulography was used to derive articulatory motion patterns from individuals with mild (n = 27) and severe (n = 16) ALS and healthy controls (n = 25). The spatiotemporal index (STI) was used as a measure of articulatory stability. Two experiments were conducted to evaluate signal length effects on the STI: (a) the effect of the number of syllables on STI values and (b) increasing lengths of subcomponents of a single phrase. Two-way mixed analyses of variance were conducted to assess the effects of syllable length and group on the STI for the tongue tip (TT), tongue back (TB), and lower lip (LL).
Results: Experiment 1 showed a significant main effect of syllable length (TT, p < .001; TB, p < .001; and LL, p < .001) and group (TT, p = .037; TB, p = .007; and LL, p = .017). TB and LL stability was generally higher with speech stimuli that included a greater number of syllables. Articulatory variability was significantly higher in speakers diagnosed with ALS compared to healthy controls. Experiment 2 showed a significant main effect of length (TT, p < .001; TB, p = .015; and LL, p < .001), providing additional support that STI values tend to be greater when calculated on longer speech signals.
Conclusions: Articulatory stability is influenced by the length of speech signals and manifests similarly in both healthy speakers and persons with ALS. TT stability may be significantly impacted by phonemic content due to greater movement flexibility. Compared to healthy controls, there was an increase in articulatory variability in those with ALS, which likely reflects deviations in speech motor control.
目的:研究刺激信号长度对肌萎缩性侧索硬化症(ALS)患者舌头和嘴唇运动模式稳定性的影响。方法:采用电磁关节显像法对轻度(27例)和重度(16例)ALS患者及健康对照(25例)进行关节运动模式分析。使用时空指数(STI)作为衡量发音稳定性的指标。通过两个实验来评估信号长度对STI值的影响:(a)音节数对STI值的影响;(b)增加单个短语子成分的长度。采用双向混合方差分析评估音节长度和分组对舌尖(TT)、舌背(TB)和下唇(LL) STI的影响。结果:实验1显示音节长度的主效应显著(TT, p < 0.001;TB, p < 0.001;LL, p < 0.001)和组(TT, p = 0.037;TB, p = .007;和LL, p = 0.017)。在包含更多音节的言语刺激下，TB和LL的稳定性通常更高。与健康对照相比，被诊断为ALS的说话者的关节变异性明显更高。实验2显示长度的主效应显著(TT, p < 0.001;TB, p = 0.015;和LL, p < .001)，提供了额外的支持，即STI值在较长的语音信号上计算时往往更大。结论:发音稳定性受语音信号长度的影响，在健康说话人和ALS患者中表现相似。由于运动灵活性大，音位内容可能会显著影响TT的稳定性。与健康对照组相比，ALS患者的发音变异性增加，这可能反映了言语运动控制的偏差。补充资料:https://doi.org/10.23641/asha.24463924。
期刊介绍：
Mission: JSLHR publishes peer-reviewed research and other scholarly articles on the normal and disordered processes in speech, language, hearing, and related areas such as cognition, oral-motor function, and swallowing. The journal is an international outlet for both basic research on communication processes and clinical research pertaining to screening, diagnosis, and management of communication disorders as well as the etiologies and characteristics of these disorders. JSLHR seeks to advance evidence-based practice by disseminating the results of new studies as well as providing a forum for critical reviews and meta-analyses of previously published work.
Scope: The broad field of communication sciences and disorders, including speech production and perception; anatomy and physiology of speech and voice; genetics, biomechanics, and other basic sciences pertaining to human communication; mastication and swallowing; speech disorders; voice disorders; development of speech, language, or hearing in children; normal language processes; language disorders; disorders of hearing and balance; psychoacoustics; and anatomy and physiology of hearing.
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