Caruso A J, Abbs J H, Gracco V L
Speech Motor Control Laboratories, Waisman Center, Madison, Wisconsin.
Brain. 1988 Apr;111 ( Pt 2):439-56. doi: 10.1093/brain/111.2.439.
This study addresses the long-standing claim that stuttering reflects an impairment in the neuromotor coordination of multiple speech movements. Upper lip (UL), lower lip (LL), and jaw (J) kinematics for nonstuttered speech behaviours in stutterers and normal speakers were examined using quantitative indices of normal multiple movement coordination reported in recent studies of gait, reaching, grasping, and speech. While two measures of coordination--dynamic movement composition and intermovement motor equivalence--did not distinguish between stutterers and normals, stutterers manifested striking differences from normal on a third measure, the sequencing of UL, LL, and J movement onsets and velocity peaks. These findings suggest that, contrary to previous hypotheses, stutterers do not manifest general problems of coordination of speech movement. Instead, stuttering appears to be associated with a specific impairment in multiple movement coordination associated with sequencing of those movements.
本研究探讨了一个长期存在的观点，即口吃反映了多种言语动作的神经运动协调受损。利用近期关于步态、伸手、抓握和言语研究中报道的正常多动作协调的定量指标，对口吃者和正常说话者非口吃言语行为的上唇（UL）、下唇（LL）和下颌（J）运动学进行了检查。虽然两种协调测量方法——动态运动组合和运动间运动等效性——没有区分口吃者和正常人，但在第三种测量方法上，口吃者与正常人表现出显著差异，即UL、LL和J运动起始和速度峰值的顺序。这些发现表明，与之前的假设相反，口吃者并没有表现出言语动作协调的普遍问题。相反，口吃似乎与这些动作顺序相关的多动作协调的特定损伤有关。
