Ward D
Department of Linguistic Science, University of Reading, U.K.
Lang Speech. 1997 Jul-Sep;40 ( Pt 3):289-310. doi: 10.1177/002383099704000305.
This study examined interarticulator timing amongst stutterers and non-stutterers from the perspective of extrinsic and intrinsic timing models of speech motor control. Timing relationships were examined for an oral closure task across stress, rate, and vowel differences. Sequential aspects of extrinsic timing theories were analyzed by peak velocity sequence profiles of upper lip, lower lip, and jaw, and nonsequential aspects by sequence period (the time period covering all three of the articulator peak velocity onsets times irrespective of sequencing order). Intrinsic timing theory was modeled using phase portrait analyses of the same data. Consistently greater phase angle variability was seen amongst the stutterers, and variability was found to be significantly greater at a faster articulatory rate and when altered stress patterns were required. No group differences were found for peak velocity sequencing, but the (sequence independent) sequence period data somewhat mirrored the phase angle findings. This finding calls into question the notion that phase angle analyses reflect purely intrinsic timing phenomena.
本研究从言语运动控制的外在和内在计时模型的角度，考察了口吃者和非口吃者之间的关节间计时情况。针对一项口腔闭合任务，研究了重音、语速和元音差异下的计时关系。通过上唇、下唇和下颌的峰值速度序列剖面图，分析了外在计时理论的顺序性方面，通过序列周期（覆盖所有三个发音器官峰值速度起始时间的时间段，无论顺序如何）分析了非顺序性方面。使用相同数据的相图分析对内在计时理论进行了建模。口吃者中始终存在更大的相位角变异性，并且发现在更快的发音速率和需要改变重音模式时，变异性显著更大。在峰值速度排序方面未发现组间差异，但（与序列无关的）序列周期数据在一定程度上反映了相位角的研究结果。这一发现对相位角分析反映的纯粹是内在计时现象这一观点提出了质疑。
