Chiu Yi-Fang, Forrest Karen
Department of Communication Sciences and Disorders, Saint Louis University, St. Louis, MO.
Department of Speech and Hearing Sciences, Indiana University, Bloomington.
J Speech Lang Hear Res. 2017 Jan 1;60(1):13-23. doi: 10.1044/2016_JSLHR-S-15-0333.
This study sought to investigate the interaction of speech movement execution with higher order lexical parameters. The authors examined how lexical characteristics affect speech output in individuals with Parkinson's disease (PD) and healthy control (HC) speakers.
Twenty speakers with PD and 12 healthy speakers read sentences with target words that varied in word frequency and neighborhood density. The formant transitions (F2 slopes) of the diphthongs in the target words were compared across lexical categories between PD and HC groups.
Both groups of speakers produced steeper F2 slopes for the diphthongs in less frequent words and words from sparse neighborhoods. The magnitude of the increase in F2 slopes was significantly less in the PD than HC group. The lexical effect on the F2 slope differed among the diphthongs and between the 2 groups.
PD and healthy speakers varied their acoustic output on the basis of word frequency and neighborhood density. F2 slope variations can be traced to higher level lexical differences. This lexical effect on articulation, however, appears to be constrained by PD.
本研究旨在探究言语运动执行与高阶词汇参数之间的相互作用。作者研究了词汇特征如何影响帕金森病（PD）患者和健康对照（HC）者的言语输出。
20名PD患者和12名健康受试者朗读包含不同词频和邻域密度目标词的句子。比较PD组和HC组中目标词双元音的共振峰过渡（F2斜率）在不同词汇类别间的差异。
两组受试者对于低频词和邻域稀疏词中的双元音均产生了更陡的F2斜率。PD组F2斜率增加的幅度显著小于HC组。双元音之间以及两组之间，词汇对F2斜率的影响存在差异。
PD患者和健康受试者根据词频和邻域密度改变其声学输出。F2斜率变化可追溯到更高层次的词汇差异。然而，这种对发音的词汇效应似乎受到PD的限制。
