Morrisette Michele L, Gierut Judith A
Department of Speech and Hearing Sciences, 200 South Jordan Avenue, Indiana University, Bloomington, IN 47405-7002 USA.
J Speech Lang Hear Res. 2002 Feb;45(1):143-59. doi: 10.1044/1092-4388(2002/011).
Word frequency and neighborhood density are properties of lexical organization that differentially influence spoken-word recognition. This study examined whether these same properties also affect spoken-word production, particularly as related to children with functional phonological delays. The hypothesis was that differential generalization would be associated with a word's frequency and its neighborhood density when manipulated as input in phonological treatment. Using a multiple baseline across subjects design, 8 children (aged 3;10 to 5;4) were randomly enrolled in 1 of 4 experimental conditions targeting errored sounds in high-frequency, low-frequency, high-density, or low-density words. Dependent measures were generalization of treated sounds and untreated sounds within and across manner classes as measured during and following treatment. Results supported a hierarchy of phonological generalization by experimental condition. The clinical implications lie in planning for generalization through the input presented in treatment. Theoretically, the results demonstrate that lexical organization of words in the mental lexicon interacts with phonological structure in learning.
词频和邻域密度是词汇组织的特性，它们对口语单词识别有不同的影响。本研究考察了这些相同的特性是否也会影响口语单词的产生，特别是与功能性语音延迟儿童相关的情况。假设是，当在语音治疗中作为输入进行操作时，差异泛化将与单词的频率及其邻域密度相关联。采用跨受试者的多基线设计，8名儿童（年龄在3岁10个月至5岁4个月之间）被随机纳入4种实验条件中的1种，这些条件针对高频、低频、高密度或低密度单词中的错误发音。因变量测量包括治疗期间和治疗后所测量的已治疗发音和未治疗发音在发音方式类别内和类别间的泛化情况。结果支持了根据实验条件得出的语音泛化层次结构。临床意义在于通过治疗中呈现的输入来规划泛化。从理论上讲，结果表明心理词典中单词的词汇组织在学习过程中与语音结构相互作用。
