Duflo S, Ouaknine M, Ghio A, Giovanni A
CHU Timone, Laboratoire d'Audio-Phonologie Expérimentale et Clinique de l'Université de la Méditerranée, Fédération d'Oto-rhino-laryngologie, 13385 Marseille cedex 5, France.
Rev Laryngol Otol Rhinol (Bord). 2007;128(5):297-303.
Pitch change during voice production is under the control of auditive and kinesthetic feedback phenomenona. The aim of the study was to determine the role of larynx kinesthetic feedback in speech production control.
To validate our laryngeal model, five porcine larynges were excised and placed on a test bench consisting of a blower and a laser photoglottometer for measurement of vocal cord vibration. We applied vibratory stimuli to the cricothyroid muscles to determine whether vibrators supplied by a generator alter the biomechanics of the larynx. Fundamental frequency (F0) was recorded under three conditions--larynx on vibration--larynx on vibration with vibrators activation--larynx on rest and vibrators activation. Once validated, 7 male and 7 female, mean age 29 years, were enrolled. Vibrators were positioned on cricothyroid muscles, cricoid and thyroid cartilages. Masking noise was used. Fundamental frequency, intensity and speech time production was measured during speech production under three conditions--normal speech, vibrators activation, and masking activation.
The preliminary study demonstrated that larynx on vibration with vibrators activation doesn't alter the vocal fold F0. For the human trial, between normal speech and vibrators activation conditions, we found a significant difference (p= 0.045 for male, p= 0.010 for female) in intonation, and no significant difference for intensity and speech time. Between normal speech and masking activation conditions, no significant differences were measured for any condition.
Use of the vibrators is a reliable method to allow the evaluation of larynx kinesthetic feedback in speech production control.
发声过程中的音高变化受听觉和动觉反馈现象的控制。本研究的目的是确定喉部动觉反馈在言语产生控制中的作用。
为验证我们的喉部模型，切除了五个猪喉，并将其放置在一个由吹风机和激光光电声门仪组成的试验台上，用于测量声带振动。我们对环甲肌施加振动刺激，以确定由发生器提供的振动器是否会改变喉部的生物力学。在三种条件下记录基频（F0）——喉部振动时——喉部振动且振动器激活时——喉部静止且振动器激活时。一旦验证成功，招募了7名男性和7名女性，平均年龄29岁。将振动器放置在环甲肌、环状软骨和甲状软骨上。使用掩蔽噪声。在三种条件下——正常言语、振动器激活和掩蔽激活——测量言语产生过程中的基频、强度和言语时长。
初步研究表明，喉部振动且振动器激活时不会改变声带F0。对于人体试验，在正常言语和振动器激活条件之间，我们发现语调存在显著差异（男性p = 0.045，女性p = 0.010），而强度和言语时长无显著差异。在正常言语和掩蔽激活条件之间，任何条件下均未测量到显著差异。
使用振动器是评估言语产生控制中喉部动觉反馈的可靠方法。
