Alsius Agnès, Mitsuya Takashi, Latif Nida, Munhall Kevin G
Psychology Department, Queen's University, Kingston, Ontario, Canada.
Department of Speech and Hearing Sciences, University of Washington, Seattle, Washington 98105, USA.
J Acoust Soc Am. 2017 Aug;142(2):838. doi: 10.1121/1.4997193.
Previous research has shown that speakers can adapt their speech in a flexible manner as a function of a variety of contextual and task factors. While it is known that speech tasks may play a role in speech motor behavior, it remains to be explored if the manner in which the speaking action is initiated can modify low-level, automatic control of vocal motor action. In this study, the nature (linguistic vs non-linguistic) and modality (auditory vs visual) of the go signal (i.e., the prompts) was manipulated in an otherwise identical vocal production task. Participants were instructed to produce the word "head" when prompted, and the auditory feedback they were receiving was altered by systematically changing the first formants of the vowel /ε/ in real time using a custom signal processing system. Linguistic prompts induced greater corrective behaviors to the acoustic perturbations than non-linguistic prompts. This suggests that the accepted variance for the intended speech sound decreases when external linguistic templates are provided to the speaker. Overall, this result shows that the automatic correction of vocal errors is influenced by flexible, context-dependant mechanisms.
先前的研究表明，说话者可以根据各种情境和任务因素灵活地调整他们的言语。虽然已知言语任务可能在言语运动行为中起作用，但言语动作的启动方式是否会改变发声运动动作的低级自动控制仍有待探索。在本研究中，在其他方面相同的发声任务中，对启动信号（即提示）的性质（语言性与非语言性）和模态（听觉与视觉）进行了操纵。参与者被指示在收到提示时说出“head”这个词，并且通过使用定制信号处理系统实时系统地改变元音/ε/的第一共振峰，改变他们所接收到的听觉反馈。与非语言提示相比，语言提示引发了对声学扰动更大的纠正行为。这表明，当向说话者提供外部语言模板时，预期语音的可接受方差会减小。总体而言，这一结果表明，语音错误的自动纠正受灵活的、依赖上下文的机制影响。
