Department of Speech-Language Pathology and Audiology, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA.
J Acoust Soc Am. 2013 Aug;134(2):1314-23. doi: 10.1121/1.4812763.
The perturbation of acoustic features in a speaker's auditory feedback elicits rapid compensatory responses that demonstrate the importance of auditory feedback for control of speech output. The current study investigated whether responses to a perturbation of speech auditory feedback vary depending on the importance of the perturbed feature to perception of the vowel being produced. Auditory feedback of speakers' first formant frequency (F1) was shifted upward by 130 mels in randomly selected trials during the speakers' production of consonant-vowel-consonant words containing either the vowel /Λ/ or the vowel /ɝ/. Although these vowels exhibit comparable F1 frequencies, the contribution of F1 to perception of /Λ/ is greater than its contribution to perception of /ɝ/. Compensation to the F1 perturbation was observed during production of both vowels, but compensatory responses during /Λ/ occurred at significantly shorter latencies and exhibited significantly larger magnitudes than compensatory responses during /ɝ/. The finding that perturbation of vowel F1 during /Λ/ and /ɝ/ yielded compensatory differences that mirrored the contributions of F1 to perception of these vowels indicates that some portion of feedback control is weighted toward monitoring and preservation of acoustic cues for speech perception.
听觉反馈中声学特征的干扰会引发快速的补偿反应，这表明听觉反馈对于语音输出的控制至关重要。本研究探讨了语音听觉反馈的干扰是否取决于受干扰特征对所产生元音感知的重要性。在说话者发出包含元音 /Λ/ 或 /ɝ/ 的辅音-元音-辅音单词时，随机选择试验中会将说话者的第一共振峰频率（F1）向上移动 130 毫赫兹。尽管这两个元音具有相似的 F1 频率，但 F1 对 /Λ/ 感知的贡献大于其对 /ɝ/ 感知的贡献。在产生这两个元音时，都观察到了对 F1 干扰的补偿，但 /Λ/ 时的补偿反应潜伏期明显更短，幅度明显大于 /ɝ/ 时的补偿反应。在 /Λ/ 和 /ɝ/ 时，F1 的干扰产生了与 F1 对这些元音感知的贡献相匹配的补偿差异，这表明反馈控制的某些部分倾向于监测和保护语音感知的声学线索。
