Folkins J W, Linville R N, Garrett J D, Brown C K
University of Iowa.
J Speech Hear Res. 1988 Jun;31(2):253-64. doi: 10.1044/jshr.3102.253.
Interactions in electromyographic activity of the upper and lower lips during speech were studied by manipulating the magnitude of bursts of activity related to bilabial closure. Four pairs of electrodes were placed in the labial musculature in each of four normal-speaking young adults. Manipulation of muscle activity usually resulted in positively correlated changes in activity recorded from the other three electrode pairs. Similar effects were found when lower lip muscle activity was manipulated and when upper lip muscle activity was manipulated, suggesting there is no asymmetry in the interactions between lips. Measurements of lower lip closing movement often correlated with the modulated muscle activity, suggesting that the size of lip opening was varied to accommodate different closing forces. The flexibility of a system producing positive correlations in the activity of different labial regions is discussed and contrasted with the suggestions that there are complementary variations, producing negative correlations, in the activity of different labial muscles during speech.
通过操纵与双唇闭合相关的活动爆发幅度，研究了言语过程中上唇和下唇肌电活动的相互作用。在四名正常说话的年轻人中，每人均在唇部肌肉组织中放置了四对电极。肌肉活动的操纵通常会导致从其他三对电极记录到的活动产生正相关变化。当下唇肌肉活动被操纵时以及上唇肌肉活动被操纵时，均发现了类似的效果，这表明唇部之间的相互作用不存在不对称性。下唇闭合运动的测量结果通常与调制后的肌肉活动相关，这表明唇部开口大小会发生变化以适应不同的闭合力量。文中讨论了一个在不同唇部区域活动中产生正相关的系统的灵活性，并将其与关于在言语过程中不同唇部肌肉活动存在互补变化、产生负相关的观点进行了对比。
