Sensorimotor adaptation to feedback perturbations of vowel acoustics and its relation to perception
Sensorimotor adaptation to feedback perturbations of vowel acoustics and its relation to perception
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DOI：
10.1121/1.2773966
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发表时间：
2007-10-01
影响因子：
2.4
通讯作者：
Guenther, Frank H.
中科院分区：
文献类型：
--
作者：
Villacorta, Virgilio M.;Perkell, Joseph S.;Guenther, Frank H.
在三个相关的实验中探讨了听觉反馈在言语运动控制中的作用。实验1研究听觉感觉运动适应：说话人改变其言语产出以补偿听觉反馈扰动的过程。当受试者在辅音-元音-辅音（CVC）单词中产生元音时，第一共振峰频率（F1）在被试者听到的反馈中发生偏移时，受试者的元音表现出补偿性共振峰偏移，当听觉反馈随后被噪声掩盖时，这种补偿性共振峰偏移得以维持，这是适应的证据。实验2研究听觉歧视的合成元音刺激不同的FI频率，使用相同的主题。那些具有更强、更敏锐的F1辨别力的个体对F1扰动的补偿更大。实验三是将语音运动规划的发音器官模型的方向转化为速度的模拟，结果表明该模型可以解释补偿的关键方面。在该模型中，元音的运动目标是听觉空间中的区域;听觉反馈的扰动调用听觉反馈控制机制，纠正扰动，这反过来又会导致前馈命令的更新，将这些纠正。扬声器敏锐度和听觉扰动的补偿量之间的关系是由扬声器的听觉目标区域的大小介导的，更敏锐的扬声器具有更小的目标区域。(c)2007年，美国声学学会。
The role of auditory feedback in speech motor control was explored in three related experiments. Experiment 1 investigated auditory sensorimotor adaptation: the process by which speakers alter their speech production to compensate for perturbations of auditory feedback. When the first formant frequency (F1) was shifted in the feedback heard by subjects as they produced vowels in consonant-vowel-consonant (CVC) words, the subjects' vowels demonstrated compensatory formant shifts that were maintained when auditory feedback was subsequently masked by noise-evidence of adaptation. Experiment 2 investigated auditory discrimination of synthetic vowel stimuli differing in F I frequency, using the same subjects. Those with more, acute F 1 discrimination had compensated more to F1 perturbation. Experiment 3 consisted of simulations with the directions into velocities of articulators model of speech motor planning, which showed that the model can account for key aspects of compensation. In the model, movement goals for vowels are regions in auditory space; perturbation of auditory feedback invokes auditory feedback control mechanisms that correct for the perturbation, which in turn causes updating of feedforward commands to incorporate these corrections. The relation between speaker acuity and amount of compensation to auditory perturbation is mediated by the size of speakers' auditory goal regions, with more acute speakers having smaller goal regions. (c) 2007 Acoustical Society of America.