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>Task dependent modulation of voice fundamental frequency responses elicited by perturbations in pitch of auditory feedback during English speech and sustained vowels.
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Task dependent modulation of voice fundamental frequency responses elicited by perturbations in pitch of auditory feedback during English speech and sustained vowels.
A noninvasive behavioral technique, called the "pitch-shift paradigm", holds the potential to reveal much about the audio-vocal mechanisms of speech-motor control. This perturbation approach elicits compensatory corrections in voice fundamental frequency (F0) to perceived disparities between the pitch of auditory feedback and intended voice F0. This study examines the task-dependent role of auditory feedback in control of voice F0 in English speech and sustained vowels. Twenty-one native speakers of American English were asked to repeatedly inflect the pitch of either the first or second syllable of the English speech phrase "you know Nina," or produce non-word sustained vowels. Brief upward and downward perturbations in pitch of auditory feedback were introduced approximately 100 ms after vocal onset. Resultant changes in voice F0 due to perturbations in pitch were compared across vocal conditions and perturbation direction.;Results of this study indicate that auditory feedback is used in real-time to maintain voice F0 during normal English speech and non-word-sustained vowels. Incomplete compensatory corrections in voice F0 due to the perturbations in pitch of auditory feedback were prevalent during both dynamic speech (gain: ∼12.7%) and static sustained vowel phonations (gain: ∼19.3%), and appear to be regulated by the same underlying mechanism as indicated by similar response latency and magnitude. However, voice F0 can be modulated across syllable boundaries during dynamic speech in a task-dependent manner as demonstrated by the change in latency according to syllable pitch inflection. Thus, voice F0 responses help maintain the underlying suprasegmental meaning of a speech phrase by delaying the onset of the voice F0 response to coincide with the pitch-inflected syllable. Phase lags in the speech phrase (∼0.016 sec) were also prevalent when the direction and onset of a perturbation in pitch did not match the direction and onset of the pitch-inflected syllable. A linear addition of a steady-state voice F0 response from a sustained vowel with the dynamic voice F 0 contour of English speech did not account for the observed phase lags. In general, these data have important implications in the development of more complete neural models of normal and disordered voice F0 control.
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机译：一种称为“音调变换范例”的非侵入性行为技术，有可能揭示很多有关语音运动控制的语音机制。这种摄动方法引起语音基频（F0）的补偿性校正，以感知听觉反馈的音高与预期语音F0之间的差异。本研究探讨了听觉反馈在控制英语语音和持续元音中的语音F0方面的任务依赖性作用。要求二十一位以美国英语为母语的人反复改变英语语音短语“ you know Nina”的第一个或第二个音节的音高，或产生非单词的持续元音。声音发作后约100毫秒引入听觉反馈音调的短暂向上和向下扰动。比较了在声音条件和扰动方向上音高扰动导致的语音F0的变化。这项研究的结果表明，在正常的英语语音和非单词保留的元音中，实时使用听觉反馈来保持语音F0。在动态语音（增益：〜12.7％）和静态持续元音发声（增益：〜19.3％）期间，由于听觉反馈音调的扰动导致语音F0的不完全补偿性校正很普遍，并且似乎受相同的基础如相似的响应潜伏期和幅度所指示的机制。但是，语音F0可以在动态语音过程中以与任务相关的方式跨音节边界进行调制，如根据音节音高变化的等待时间变化所证明的。因此，语音F0响应通过延迟语音F0响应的开始时间以使其与音高变化的音节相一致，有助于维持语音短语的基本节段意义。当音高扰动的方向和开始与音高变化的音节的方向和开始不匹配时，语音短语中的相位滞后（约0.016秒）也很普遍。来自持续元音的稳态语音F0响应与英语语音的动态语音F 0轮廓的线性相加并不能说明所观察到的相位滞后。通常，这些数据对正常和无序语音F0控制的更完整神经模型的开发具有重要意义。
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