van Lieshout P H, Peters H F, Starkweather C W, Hulstijn W
Nijmegen Institute of Cognition Research and Information Technology, The Netherlands.
J Speech Hear Res. 1993 Feb;36(1):55-63. doi: 10.1044/jshr.3601.55.
Electromyograph (EMG) signals of the m. orbicularis oris inferior evoked by lip-rounding gestures were analyzed to see whether stutterers in their perceptually fluent speech had higher levels of EMG and longer EMG durations. The relationship between levels of EMG and durations of elevated muscle activity was investigated, and a search for the best discriminating EMG measure was made. In contrast to some previous studies on the EMG signals of stutterers, a relatively large group of stutterers (n = 15) and control speakers (n = 20), matched for age and gender, was examined. Both groups took part in a reaction time experiment using verbal items of different length (syllables, words, and sentences) in two time-stress conditions. Measures were taken for lip muscle activity during lip-rounding gestures for the Dutch /o/ sound. Only perceptually fluent trials were analyzed. The results showed that stutterers had significantly higher EMG levels at the moment of speech onset and during speech production than nonstutterers. A much larger difference between the two groups, however, was found for the EMG peak latency measure, which proved to be a very powerful distinctive feature in differentiating stutterers from nonstutterers. The results were discussed with respect to previous findings and recent theories about (speech) motor control strategies.
分析了由唇圆撮手势诱发的口轮匝肌下部的肌电图（EMG）信号，以观察口吃者在其可感知的流畅言语中是否具有更高的肌电图水平和更长的肌电图持续时间。研究了肌电图水平与肌肉活动增强持续时间之间的关系，并寻找最佳的鉴别肌电图测量方法。与之前一些关于口吃者肌电图信号的研究不同，本次研究考察了一组相对较大的口吃者（n = 15）和与之年龄和性别匹配的对照者（n = 20）。两组参与者都在两种时间压力条件下，使用不同长度（音节、单词和句子）的语言项目进行了反应时间实验。在发荷兰语/o/音时的唇圆撮手势过程中，对口唇肌肉活动进行了测量。仅分析了可感知的流畅试验。结果表明，口吃者在言语起始时刻和言语产生过程中的肌电图水平显著高于非口吃者。然而，在肌电图峰值潜伏期测量方面，两组之间的差异要大得多，这被证明是区分口吃者和非口吃者的一个非常有效的显著特征。结合之前的研究结果和关于（言语）运动控制策略的最新理论对这些结果进行了讨论。
