Neilson P D, O'Dwyer N J
J Speech Hear Res. 1984 Dec;27(4):502-17. doi: 10.1044/jshr.2704.502.
Athetoid dysarthria is thought to result from involuntary movements which are variable and irregular in nature. In this study, electromyographic (EMG) activity recorded from six speech muscles was quantified during repetitions of a test sentence by normal and athetoid adult subjects. In the athetoid subjects the articulation of the test sentence was disrupted intermittently by involuntary activity which usually occurred in the time intervals between the syllables in the test sentence, rather than during articulation of the syllables themselves. The EMG activity associated with each syllable in the test sentence was partitioned into reproducible and variable components. The ratio of the reproducible component to the variable component--the signal-to-noise ratio--did not differ significantly between the two subject groups. In the athetoid subjects, however, the reproducible component of the EMG activity was grossly abnormal. We concluded that this abnormal voluntary activity, rather than variable involuntary activity, was the primary cause of athetoid dysarthria.
手足徐动型构音障碍被认为是由本质上可变且不规则的不自主运动所致。在本研究中，正常和手足徐动型成年受试者在重复测试句子时，对从六块言语肌肉记录到的肌电图（EMG）活动进行了量化。在手足徐动型受试者中，测试句子的发音会被不自主活动间歇性打断，这种活动通常发生在测试句子音节之间的时间间隔内，而非音节发音过程中。测试句子中与每个音节相关的EMG活动被分为可重复部分和可变部分。两个受试者组之间，可重复部分与可变部分的比率——信噪比——没有显著差异。然而，在手足徐动型受试者中，EMG活动的可重复部分明显异常。我们得出结论，这种异常的自主活动而非可变的不自主活动是手足徐动型构音障碍的主要原因。
