LEXICAL EFFECTS ON SPOKEN WORD RECOGNITION BY PEDIATRIC COCHLEAR IMPLANT USERS
LEXICAL EFFECTS ON SPOKEN WORD RECOGNITION BY PEDIATRIC COCHLEAR IMPLANT USERS
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DOI：
10.1097/00003446-199510000-00004
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发表时间：
1995-10-01
期刊：
影响因子：
3.7
通讯作者：
OSBERGER, MJ
中科院分区：
文献类型：
--
作者：
KIRK, KI;PISONI, DB;OSBERGER, MJ
目的：本研究的目的是1）检查词汇特征对使用多通道人工耳蜗（CI）的儿童的口语单词识别性能的影响，以及2）将他们在词汇控制单词列表上的表现与他们在传统单词识别测试PB-K上的表现进行比较。在两个不同的实验中，14至19名儿童CI用户谁证明至少有一些开放式语音识别作为受试者。基于计算分析，构建了单词列表，以系统地检查词频、词汇密度（即，音位相似的单词或相邻单词的数量）和单词长度。被试在这些新的测试和PB-K上的表现也compared.Results：单词正确识别的百分比是显着较高的词汇“容易”的单词（高频词与少数邻居）比“难”的单词（低频词与许多邻居），但没有词汇的音素识别成绩的影响。单词识别性能始终高于词汇控制列表比PB-K。此外，对多音节刺激的单词识别比单音节刺激更好。结论：这些结果表明，儿科人工耳蜗植入者对单词之间的声学语音相似性很敏感，他们在长期记忆中将单词组织到相似的邻近区域中，并且他们使用这些结构信息来识别孤立的单词。结果进一步表明，PB-K低估了这些受试者的口语单词识别。
Objective: The purposes of this study were 1) to examine the effect of lexical characteristics on the spoken word recognition performance of children who use a multichannel cochlear implant (CI), and 2) to compare their performance on lexically controlled word lists with their performance on a traditional test of word recognition, the PB-K.Design: In two different experiments, 14 to 19 pediatric CI users who demonstrated at least some open-set speech recognition served as subjects. Based on computational analyses, word lists were constructed to allow systematic examination of the effects of word frequency, lexical density (i.e., the number of phonemically similar words, or neighbors), and word length. The subjects' performance on these new tests and the PB-K also was compared.Results: The percentage of words correctly identified was significantly higher for lexically ''easy'' words (high frequency words with few neighbors) than for ''hard'' words (low frequency words with many neighbors), but there was no lexical effect on phoneme recognition scores. Word recognition performance was consistently higher on the lexically controlled lists than on the PB-K. In addition, word recognition was better for multisyllabic than for monosyllabic stimuli.Conclusions: These results demonstrate that pediatric cochlear implant users are sensitive to the acoustic-phonetic similarities among words, that they organize words into similarity neighborhoods in long-term memory, and that they use this structural information in recognizing isolated words. The results further suggest that the PB-K underestimates these subjects' spoken word recognition.