Caligiuri M P
Research Service, Veterans Administration Medical Center.
Brain Lang. 1989 Apr;36(3):493-502. doi: 10.1016/0093-934x(89)90080-1.
This study addressed the question of whether or not speaking rate influences articulatory hypokinesia in dysarthria associated with Parkinson's disease. Analyses of parkinsonian speech samples revealed mean speaking rates consistent with normal controls. Thus, speaking rate was not abnormal overall in this group of dysarthric subjects. Kinematic analyses of labial displacement amplitude, peak instantaneous velocity, and movement time were made during repetitive syllable production spoken at two speaking rates: 3-5 syllables/sec and 5-7 syllables/sec. The results suggested that labial movements were normal at the slower of the two speaking rates. Conversely, labial movements became hypokinetic as speaking rate increased to the rate consistent with conversational speech. These findings provide a physiologic basis for the perception of hypokinetic dysarthria in Parkinson's disease and suggest that speaking rate may be an important control variable contributing to articulatory hypokinesia in Parkinson's disease. Moreover, these findings provide quantitative evidence that articulatory hypokinesia plays a dominant role in the perception of parkinsonian dysarthria.
本研究探讨了语速是否会影响帕金森病所致构音障碍中的构音运动减退问题。对帕金森病患者的言语样本进行分析后发现，其平均语速与正常对照组一致。因此，在这组构音障碍患者中，总体语速并无异常。在以每秒3 - 5个音节和每秒5 - 7个音节这两种语速重复说出音节的过程中，对唇部位移幅度、峰值瞬时速度和运动时间进行了运动学分析。结果表明，在两种语速中较慢的那种语速下，唇部运动是正常的。相反，当语速增加到与日常对话语速一致时，唇部运动就会出现运动减退。这些发现为帕金森病中运动减退型构音障碍的感知提供了生理基础，并表明语速可能是导致帕金森病构音运动减退的一个重要控制变量。此外，这些发现提供了定量证据，表明构音运动减退在帕金森病构音障碍的感知中起主导作用。
