Please Say What This Word Is-Vowel-Extrinsic Normalization in the Sensorimotor Control of Speech
Please Say What This Word Is-Vowel-Extrinsic Normalization in the Sensorimotor Control of Speech
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DOI：
10.1037/xhp0000209
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发表时间：
2016-07-01
影响因子：
2.1
通讯作者：
Shiller, Douglas M.
中科院分区：
文献类型：
--
作者：
Bourguignon, Nicolas J.;Baum, Shari R.;Shiller, Douglas M.
语音感知的适应性影响语音产生的声学目标的程度尚不清楚。例如，听者可以迅速适应依赖于说话者的语音特性——这一过程被称为元音外在正常化——而不会改变他们的语音输出。然而，最近的证据表明，基于强化的元音感知学习改变了语音听觉反馈的处理，影响了元音产生过程中的感觉运动控制。这表明，更自动和普遍存在的感知可塑性形式，如那些表征感知说话者规范化的形式，也可能影响语言的感觉运动控制。为了验证这一假设，我们开始研究元音-外在正常化对实验对象对自己的言语结果的解释可能产生的影响。通过将众所周知的元音-外在归一化操作与语音听觉-运动适应相结合，我们发现暴露于不同的元音频谱特性随后会改变语音产生过程中的听觉反馈处理，从而影响语音运动适应。这些发现扩展了知觉归一化过程的范围，包括听觉反馈，并支持语音感知中发现的自然发生的适应影响语音产生的观点。
The extent to which the adaptive nature of speech perception influences the acoustic targets underlying speech production is not well understood. For example, listeners can rapidly accommodate to talker-dependent phonetic properties-a process known as vowel-extrinsic normalization-without altering their speech output. Recent evidence, however, shows that reinforcement-based learning in vowel perception alters the processing of speech auditory feedback, impacting sensorimotor control during vowel production. This suggests that more automatic and ubiquitous forms of perceptual plasticity, such as those characterizing perceptual talker normalization, may also impact the sensorimotor control of speech. To test this hypothesis, we set out to examine the possible effects of vowel-extrinsic normalization on experimental subjects' interpretation of their own speech outcomes. By combining a well-known manipulation of vowel-extrinsic normalization with speech auditory-motor adaptation, we show that exposure to different vowel spectral properties subsequently alters auditory feedback processing during speech production, thereby influencing speech motor adaptation. These findings extend the scope of perceptual normalization processes to include auditory feedback and support the idea that naturally occurring adaptations found in speech perception impact speech production.