Smith A, Kleinow J
Department of Audiology and Speech Sciences, Purdue University, West Lafayette, IN 47907, USA.
J Speech Lang Hear Res. 2000 Apr;43(2):521-36. doi: 10.1044/jslhr.4302.521.
Articulatory kinematics were analyzed to determine if adults who stutter are generally poorer at speech movement pattern generation and if changing speech rate affects their stability in the same way that it affects normally fluent controls. Adults who stutter (n = 14) and a matched group of controls produced fluent repetitions of a simple phrase at normal, slow, and fast rates. A composite index of spatiotemporal stability (STI), as well as independent measures of timing and spatial variability, revealed that adults who stutter can operate within normal movement parameter ranges under low-demand speaking conditions. However, some of the stuttering participants showed evidence of abnormal instability even when repeating a simple utterance at habitual rate. Also, measures of relative timing indicated that adults who stutter, unlike their matched controls, are not better timers at habitual vs. nonpreferred speech rates. Overall, the results suggest that the kinematic characteristics of the fluent speech of adults who stutter generally overlap that of normally fluent speakers; however, subtle differences in kinematic parameters are interpreted to reveal their susceptibility to speech motor breakdown when performance demands increase.
分析发音运动学，以确定口吃成年人在言语运动模式生成方面是否普遍较差，以及改变语速是否会以与影响正常流利对照组相同的方式影响他们的稳定性。口吃成年人（n = 14）和一组匹配的对照组以正常、缓慢和快速语速流利地重复一个简单短语。时空稳定性综合指数（STI）以及时间和空间变异性的独立测量结果显示，口吃成年人在低需求言语条件下能够在正常运动参数范围内操作。然而，一些口吃参与者即使以习惯语速重复简单话语时也表现出异常不稳定的迹象。此外，相对时间测量表明，与匹配的对照组不同，口吃成年人在习惯语速与非偏好语速下并非更好的计时者。总体而言，结果表明口吃成年人流利言语的运动学特征通常与正常流利说话者的特征重叠；然而，运动学参数的细微差异被解释为揭示了他们在表现要求增加时对言语运动障碍的易感性。
