Increased speech contrast induced by sensorimotor adaptation to a nonuniform auditory perturbation.
Increased speech contrast induced by sensorimotor adaptation to a nonuniform auditory perturbation.
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感觉运动适应不均匀的听觉扰动引起的语音对比度增加。
DOI：
10.1152/jn.00466.2020
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发表时间：
2021
影响因子：
2.5
通讯作者：
Niziolek,CarolineA
中科院分区：
文献类型：
--
作者：
Parrell,Benjamin;Niziolek,CarolineA
当听觉反馈以一种一致的方式受到干扰时，说话者学会调整他们的言语来补偿，这一过程被称为感觉运动适应。虽然这种模式已经为我们理解的感觉反馈在言语运动控制中的作用提供了大量信息，但其诱导言语行为相关变化的能力仍然不清楚。由于减少元音对比度有助于在许多神经性言语障碍的可懂度赤字，我们研究人类说话者的能力，以适应一个不均匀的扰动场，旨在影响元音的独特性，应用一个转变，取决于元音正在生产。25名参与者暴露于这种“元音集中”反馈扰动，其中前两个共振峰频率向每个参与者的元音空间的中心移动，使元音彼此不那么明显。说话者适应了这种不均匀的转变，学习产生角元音，增加元音空间面积和元音对比度，以部分克服感知集中。元音对比度的增加发生在没有伴随的持续时间增加，并持续反馈转移后被删除，包括10分钟的沉默期后。这些研究结果建立了一个感觉运动适应范例的有效性，以增加元音对比度，表明复杂的，不均匀的改变感觉反馈可以成功地驱动相关的变化可理解的communication.NEW & NOTEWORTHTo日期，言语运动学习诱发的感觉运动适应研究已经很少的生态后果的沟通。通过诱导复杂的，不均匀的声学错误，我们表明，适应可以被利用，导致语音对比度的增加，这种变化有能力提高可懂度。这项研究是相关的模型的感觉运动整合跨运动域，表明复杂的改变感觉反馈可以成功地驱动相关的生态行为的变化。
When auditory feedback is perturbed in a consistent way, speakers learn to adjust their speech to compensate, a process known as sensorimotor adaptation. Although this paradigm has been highly informative for our understanding of the role of sensory feedback in speech motor control, its ability to induce behaviorally relevant changes in speech that affect communication effectiveness remains unclear. Because reduced vowel contrast contributes to intelligibility deficits in many neurogenic speech disorders, we examine human speakers’ ability to adapt to a nonuniform perturbation field that was designed to affect vowel distinctiveness, applying a shift that depended on the vowel being produced. Twenty-five participants were exposed to this “vowel centralization” feedback perturbation in which the first two formant frequencies were shifted toward the center of each participant’s vowel space, making vowels less distinct from one another. Speakers adapted to this nonuniform shift, learning to produce corner vowels with increased vowel space area and vowel contrast to partially overcome the perceived centralization. The increase in vowel contrast occurred without a concomitant increase in duration and persisted after the feedback shift was removed, including after a 10-min silent period. These findings establish the validity of a sensorimotor adaptation paradigm to increase vowel contrast, showing that complex, nonuniform alterations to sensory feedback can successfully drive changes relevant to intelligible communication.NEW & NOTEWORTHYTo date, the speech motor learning evoked in sensorimotor adaptation studies has had little ecological consequences for communication. By inducing complex, nonuniform acoustic errors, we show that adaptation can be leveraged to cause an increase in speech sound contrast, a change that has the capacity to improve intelligibility. This study is relevant for models of sensorimotor integration across motor domains, showing that complex alterations to sensory feedback can successfully drive changes relevant to ecological behavior.