Department of Psychology, Queen's University, Humphrey Hall, 62 Arch Street, Kingston, Ontario, K7L 3N6, Canada.
J Acoust Soc Am. 2020 Dec;148(6):3709. doi: 10.1121/10.0002923.
In this study, both between-subject and within-subject variability in speech perception and speech production were examined in the same set of speakers. Perceptual acuity was determined using an ABX auditory discrimination task, whereby speakers made judgments between pairs of syllables on a /ɛ/ to /æ/ acoustic continuum. Auditory feedback perturbations of the first two formants were implemented in a production task to obtain measures of compensation, normal speech production variability, and vowel spacing. Speakers repeated the word "head" 120 times under varying feedback conditions, with the final Hold phase involving the strongest perturbations of +240 Hz in F1 and -300 Hz in F2. Multiple regression analyses were conducted to determine whether individual differences in compensatory behavior in the Hold phase could be predicted by perceptual acuity, speech production variability, and vowel spacing. Perceptual acuity significantly predicted formant changes in F1, but not in F2. These results are discussed in consideration of the importance of using larger sample sizes in the field and developing new methods to explore feedback processing at the individual participant level. The potential positive role of variability in speech motor control is also considered.
在这项研究中，同一组说话者同时考察了言语感知和言语产生的组间和组内变异性。使用 ABX 听觉辨别任务来确定感知敏锐度，说话者在 /ɛ/ 到 /æ/ 的连续音之间对双音节进行判断。在产生任务中实施前两个共振峰的听觉反馈扰动，以获得补偿、正常言语产生变异性和元音间距的测量值。说话者在不同的反馈条件下重复“head”一词 120 次，最后一个保持阶段涉及在 F1 中最强的 +240Hz 以及在 F2 中-300Hz 的扰动。进行多元回归分析以确定保持阶段的补偿行为的个体差异是否可以通过感知敏锐度、言语产生变异性和元音间距来预测。感知敏锐度显著预测了 F1 中的共振峰变化，但在 F2 中没有。考虑到在该领域使用更大样本量的重要性以及开发新方法在个体参与者水平探索反馈处理，讨论了这些结果。还考虑了言语运动控制中变异性的潜在积极作用。
