Tjaden Kris, Martel-Sauvageau Vincent
Department of Communicative Disorders and Sciences, University at Buffalo, NY.
Rehabilitation Department, Laval University, Quebec City, Canada.
Am J Speech Lang Pathol. 2017 Jun 22;26(2S):569-582. doi: 10.1044/2017_AJSLP-16-0090.
The impact of clear speech or an increased vocal intensity on consonant spectra was investigated for speakers with mild dysarthria secondary to multiple sclerosis or Parkinson's disease and healthy controls.
Sentences were read in habitual, clear, and loud conditions. Spectral moment coefficients were obtained for word-initial and word-medial /s/, /ʃ/, /t/, and /k/. Global production differences among conditions were confirmed with measures of vocal intensity and articulation rate.
Static or slice-in-time first moments (M1) for loud differed most frequently from habitual, but neither loud nor clear enhanced M1 contrast for consonant pairs. In several instances, the clear and loud conditions yielded stable or nonvarying fricative M1 time histories. Spectral contrast was reduced for word-medial versus word-initial consonant pairs.
The finding that the loud and especially clear condition yielded fairly subtle changes in consonant spectra suggests these global techniques may minimally enhance consonant segmental production or contrast in mild dysarthria. The robust effect of word position on consonant spectra indicates that this variable deserves consideration in future studies. Future research also is needed to investigate how or whether consonant production bears on the improved intelligibility previously reported for these global dysarthria treatment techniques.
研究清晰言语或提高嗓音强度对继发于多发性硬化症或帕金森病的轻度构音障碍患者以及健康对照者辅音频谱的影响。
在习惯、清晰和大声的条件下朗读句子。获取单词开头和中间位置的/s/、/ʃ/、/t/和/k/的频谱矩系数。通过嗓音强度和发音速率的测量来确认不同条件下的整体发音差异。
大声条件下的静态或即时第一矩（M1）与习惯条件下的差异最为频繁，但大声和清晰条件均未增强辅音对的M1对比度。在几种情况下，清晰和大声条件下产生了稳定或不变的擦音M1时间历程。单词中间位置与开头位置的辅音对的频谱对比度降低。
大声尤其是清晰条件下辅音频谱变化相当细微这一发现表明，这些整体技术可能对轻度构音障碍中辅音音段的产生或对比度的增强作用极小。单词位置对辅音频谱有显著影响，这表明该变量在未来研究中值得考虑。未来还需要研究辅音产生如何或是否与先前报道的这些整体构音障碍治疗技术所改善的可懂度相关。
