Goffman Lisa, Gerken Louann, Lucchesi Julie
Speech, Language, and Hearing Sciences, Heavilon Hall, Purdue University, 500 Oval Drive, West Lafayette, IN 47907, USA.
J Speech Lang Hear Res. 2007 Apr;50(2):444-58. doi: 10.1044/1092-4388(2007/031).
To assess how prosodic prominence and hierarchical foot structure influence segmental and articulatory aspects of speech production, specifically segmental accuracy and variability, and oral movement trajectory variability.
Thirty individuals participated: 10 young adults, 10 children who are normally developing, and 10 children diagnosed with specific language impairment. Segmental error and segmental variability and movement trajectory variability were compared in low and high prosodic prominence conditions (i.e., strong and weak syllables) and in different prosodic foot structures.
Between-participants findings were that both groups of children showed more segmental error and segmental variability and more movement trajectory variability than did adults. A similar within-participant pattern of results was observed for all 3 groups. Prosodic prominence influenced both segmental and motor levels of analysis, with weak syllables produced less accurately and with more lip and jaw movement trajectory variability than strong syllables. However, hierarchical foot structure affected segmental but not motor measures of speech production accuracy and variability.
Motor and segmental variables were not consistently aligned. This pattern of results has clinical implications because inferences about motor variability may not directly follow from observations of segmental variability.
评估韵律重音和层级音步结构如何影响言语产生的音段和发音方面，特别是音段准确性和变异性以及口腔运动轨迹变异性。
30名个体参与研究，其中包括10名年轻成年人、10名发育正常的儿童以及10名被诊断为特定语言障碍的儿童。在低韵律重音条件和高韵律重音条件（即强弱音节）以及不同韵律音步结构下，对音段错误、音段变异性和运动轨迹变异性进行了比较。
参与者之间的研究结果表明，两组儿童在音段错误、音段变异性和运动轨迹变异性方面均比成年人表现得更多。所有3组参与者内部均观察到类似的结果模式。韵律重音影响了音段和运动分析水平，弱音节的发音准确性低于强音节，且唇部和下颌运动轨迹变异性更大。然而，层级音步结构影响了言语产生准确性和变异性的音段指标，但未影响运动指标。
运动变量和音段变量并非始终一致。这种结果模式具有临床意义，因为关于运动变异性的推断可能无法直接从音段变异性的观察中得出。
