Titze I R, Solomon N P, Luschei E S, Hirano M
Department of Speech Pathology and Audiology, University of Iowa, Iowa City 52242.
J Voice. 1994 Sep;8(3):215-23. doi: 10.1016/s0892-1997(05)80292-9.
A stabilized tremor hypothesis for vocal vibrato is investigated. The stabilizer is assumed to be a mechanical oscillator that may contain reflex loops. Artificial stimulation of the cricothyroid muscle in one subject showed a well-defined resonance curve of this peripheral oscillator at approximately 5.0 Hz. Combined artificial stimulation with natural vibrato showed that the vibrato could be entrained by a peripheral stimulus, provided the two frequencies are separated by no more than approximately +/- 0.5 Hz. This suggests that vibrato frequencies are not "hard-wired" centrally, even though a collection of centrally generated tremors may serve as excitation to the peripheral oscillator.
本文研究了一种关于声带颤音的稳定震颤假说。假定稳定器是一个可能包含反射回路的机械振荡器。对一名受试者的环甲肌进行人工刺激，结果显示该外周振荡器在约5.0 Hz处有明确的共振曲线。人工刺激与自然颤音相结合的结果表明，只要两个频率的差值不超过约±0.5 Hz，外周刺激就能带动颤音。这表明，即使中枢产生的一系列震颤可能作为外周振荡器的激发因素，但颤音频率并非在中枢进行“硬连线”设定。
