Grigos Maria I
Department of Speech Language Pathology and Audiology, New York University, 665 Broadway, Suite 918, New York, NY 10003, USA.
J Speech Lang Hear Res. 2009 Feb;52(1):164-77. doi: 10.1044/1092-4388(2008/07-0220). Epub 2008 Jul 29.
The present study explored articulator movement variability during voicing contrast acquisition. The purpose was to examine whether oral articulator movement trajectories associated with the production of voiced/voiceless bilabial phonemes in children became less variable over time.
Jaw, lower lip, and upper lip movements were recorded longitudinally in six, 19 month-old children as they began producing the voiceless phoneme /p/. Displacement signals were time and amplitude normalized. The spatiotemporal index (A. Smith, L. Goffman, H. Zelaznik, S. Ying, & C. McGillem, 1995) was computed to examine the variability in movement trajectories across repeated productions of target utterances.
Spatiotemporal variability of lip and jaw movements significantly decreased as children began producing the voiceless phoneme /p/. A significant negative correlation between the STI and the length of voice onset time (VOT) was also found in the voiceless productions in 4 of the 6 participants.
Oral articulator movement variability is reduced in children across the stabilization of voicing contrast acquisition. Further, the relationship between VOT contrast production and movement variability suggests that a coordinate system between the oral and laryngeal articulators may be refined as children acquire the voicing contrast.
本研究探讨了在语音对比习得过程中咬合架运动的变异性。目的是研究儿童在发出浊音/清音双唇音时，口腔发音器官的运动轨迹是否会随着时间的推移而变得不那么多变。
纵向记录六名19个月大儿童在开始发出清音/p/时的下颌、下唇和上唇运动。对位移信号进行时间和幅度归一化处理。计算时空指数（A.史密斯、L.戈夫曼、H.泽拉兹尼克、S.英和C.麦吉尔姆，1995年），以检验目标话语重复发音过程中运动轨迹的变异性。
随着儿童开始发出清音/p/，嘴唇和下颌运动的时空变异性显著降低。在6名参与者中的4名的清音发音中，还发现时空指数与语音起始时间（VOT）的长度之间存在显著的负相关。
在语音对比习得稳定的过程中，儿童口腔发音器官的运动变异性降低。此外，VOT对比产生与运动变异性之间的关系表明，随着儿童习得语音对比，口腔和喉部发音器官之间的坐标系可能会得到完善。
