McClean M, Goldsmith H, Cerf A
J Speech Hear Res. 1984 Sep;27(3):342-9. doi: 10.1044/jshr.2703.342.
The purpose of this study was to describe the temporal patterns and spectral characteristics of antagonist lip muscle EMG and lip displacement during bilabial disfluencies in adult stutterers. Selective EMG recordings were obtained in five adult stutterers of mentalis and depressor labii inferior motor units (MENT and DLI) that were activated in a reciprocal manner during fluent speech. During disfluencies (N = 91) these same motor units were activated primarily in a reciprocal manner or DLI was not activated. These findings are not consistent with previous reports that stutterers' disfluencies involve cocontraction and overall increases in the activation levels of antagonist muscles. Spectral analysis of bilabial disfluencies revealed peaks at 5-9 Hz in the MENT EMG spectra of the five subjects and at 5-6 Hz in the displacement spectra of two subjects. A refinement in the classification of stutterers' disfluencies is suggested on the basis of individual differences in lip EMG and displacement spectra, and the mechanisms of stuttering tremor are discussed.
本研究的目的是描述成年口吃者双唇不流畅言语期间拮抗肌唇肌肌电图（EMG）和唇部位移的时间模式及频谱特征。对5名成年口吃者进行选择性EMG记录，记录颏肌和降下唇肌运动单元（MENT和DLI），在流畅言语期间它们以相互交替的方式被激活。在不流畅言语期间（N = 91），这些相同的运动单元主要以相互交替的方式被激活，或者DLI未被激活。这些发现与之前关于口吃者不流畅言语涉及拮抗肌共同收缩以及拮抗肌激活水平总体增加的报道不一致。对双唇不流畅言语的频谱分析显示，5名受试者的MENT EMG频谱在5 - 9 Hz处有峰值，两名受试者的位移频谱在5 - 6 Hz处有峰值。基于唇部EMG和位移频谱的个体差异，对口吃者不流畅言语的分类提出了一种改进方法，并讨论了口吃震颤的机制。
