Coordination of lip muscle activity by 2-year-old children during speech and nonspeech tasks.
Coordination of lip muscle activity by 2-year-old children during speech and nonspeech tasks.
复制标题
2 岁儿童在言语和非言语任务中唇部肌肉活动的协调。
DOI：
10.1044/jslhr.4006.1373
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Moore,CA
中科院分区：
文献类型：
--
作者：
Ruark,JL;Moore,CA
本研究旨在量化2岁儿童在言语和非言语行为中唇肌活动的协调组织。7名2岁儿童在咀嚼、音节重复、嘴唇突出和言语（重复两个词的发音）任务中获得了右上唇和下唇活动的肌电图（EMG）记录。任务比较发现，上下唇活动的协调组织具有任务特异性，不同的任务采用不同的协调策略。唇突出和音节重复任务产生了强烈的耦合的上唇和下唇的活动。唇圆（句子包含唇圆元音/u/）和“非唇”的语音任务（句子免费的bilabials和唇圆元音）导致低耦合的上下嘴唇活动。中度耦合的上唇和下唇活动是明显的咀嚼和双唇语音任务（句子加载双唇爆破）。这一发现，即2岁儿童口周系统的协调元素是任务特异性的，扩展了以前对成人和儿童的研究结果，其中任务特异性协调策略被下颌和口周系统采用（摩尔，1993;摩尔和Ruark，1996;摩尔，Smith和Ringel，1988; Wohlert和Goffman，1994）。2岁儿童口周系统的任务依赖性协调支持这样一种观点，即发展言语和早期发展行为（即，吸吮、咀嚼）是由不同的控制机制介导的。
This investigation was designed to quantify the coordinative organization of lip muscle activity of 2-year-old children during speech and nonspeech behaviors. Electromyographic (EMG) recordings of right upper and lower lip activity of seven 2-year-old children were obtained during productions of chewing, syllable repetition, lip protrusion, and speech (repeated two-word utterances) tasks. Task comparisons revealed that the coordinative organization of upper and lower lip activity is task specific; different coordinative strategies are employed for different tasks. Lip protrusion and syllable repetition tasks yielded strong coupling of upper and lower lip activity. Lip rounding (sentences containing the lip-rounding vowel /u/) and "nonlabial" speech tasks (sentences free of bilabials and lip-rounding vowels) resulted in low coupling of upper and lower lip activity. Moderate levels of coupling of upper and lower lip activity were evident for chewing and bilabial speech tasks (sentences loaded with bilabial plosion). This finding, that the coordinative elements of the perioral system of 2-year-olds are task specific, extends the results of previous studies of adults and children, where task-specific coordinative strategies were employed by the mandibular and perioral systems Moore, 1993; Moore & Ruark, 1996; Moore, Smith, & Ringel, 1988; Wohlert & Goffman, 1994). The task-dependent coordination of the perioral system of 2-year-olds supports the notion that developing speech and earlier developing oromotor behaviors (i.e., sucking, chewing) are mediated by different control mechanisms.