UC Berkeley - UCSF Graduate Program in Bioengineering, University of California San Francisco, San Francisco, California 94143, USA.
Educational Testing Service R&D, San Francisco, California 94105, USA.
J Acoust Soc Am. 2020 Dec;148(6):3682. doi: 10.1121/10.0002876.
A hallmark feature of speech motor control is its ability to learn to anticipate and compensate for persistent feedback alterations, a process referred to as sensorimotor adaptation. Because this process involves adjusting articulation to counter the perceived effects of altering acoustic feedback, there are a number of factors that affect it, including the complex relationship between acoustics and articulation and non-uniformities of speech perception. As a consequence, sensorimotor adaptation is hypothesised to vary as a function of the direction of the applied auditory feedback alteration in vowel formant space. This hypothesis was tested in two experiments where auditory feedback was altered in real time, shifting the frequency values of the first and second formants (F1 and F2) of participants' speech. Shifts were designed on a subject-by-subject basis and sensorimotor adaptation was quantified with respect to the direction of applied shift, normalised for individual speakers. Adaptation was indeed found to depend on the direction of the applied shift in vowel formant space, independent of shift magnitude. These findings have implications for models of sensorimotor adaptation of speech.
言语运动控制的一个显著特征是它能够学习预测和补偿持续的反馈变化，这个过程被称为感觉运动适应。由于这个过程涉及调整发音以抵消感知到的声学反馈变化的影响，因此有许多因素会影响它，包括声学和发音之间的复杂关系以及言语感知的非均匀性。因此，感觉运动适应被假设为随元音共振峰空间中应用听觉反馈变化的方向而变化。这个假设在两个实验中得到了检验，在这些实验中，听觉反馈被实时改变，改变参与者语音的第一和第二共振峰（F1 和 F2）的频率值。根据个体的情况进行了移位设计，并且根据个体说话者进行了归一化，以适应移位的方向来量化感觉运动适应。确实发现适应取决于元音共振峰空间中应用移位的方向，而与移位幅度无关。这些发现对言语感觉运动适应的模型有影响。
