Folkins J W, Zimmermann G N
J Acoust Soc Am. 1982 May;71(5):1225-33. doi: 10.1121/1.387771.
Electrical stimulation was used to produce unexpected, involuntary depression of the lower lip in three normal young adults. Stimulation was timed to begin 500 to 40 ms prior to voice offset in [aep] and (Ip]. Upper lip, lower lip, and jaw movements were measured with a strain gauge system. Movements in 104 syllables with lower-lip stimulation were compared to the preceding normal syllable. Both the jaw and upper lip compensated for the involuntary perturbations in lower-lip movement. Compensatory movements did not occur as additional, discrete gestures following stimulation onset, but appeared as an increase in the size of closing movements. Bilabial closure was produced at the typical time (within - 10 to + 20 ms of voice offset) in 68% of the perturbed syllables, but it was delayed (a mean of 61 ms) in the remaining 32%. Neither the incidence nor the magnitude of this delay appeared to be related to the jaw position at stimulation onset or to the time between stimulation onset and voice offset.
对三名正常年轻成年人进行电刺激，以产生下唇意外的、非自主性的压低。刺激时间设定为在[aep]和[Ip]中语音结束前500至40毫秒开始。用上应变片系统测量上唇、下唇和下颌的运动。将104个下唇受刺激音节的运动与之前的正常音节进行比较。下颌和上唇都对下唇运动的非自主性扰动进行了补偿。补偿运动并非在刺激开始后作为额外的离散手势出现，而是表现为闭合运动幅度的增加。在68%的受扰音节中，双唇闭合在典型时间（语音结束前-10至+20毫秒内）产生，但在其余32%的音节中延迟了（平均61毫秒）。这种延迟的发生率和幅度似乎都与刺激开始时的下颌位置或刺激开始与语音结束之间的时间无关。
