Perceptually Salient Sound Distortions and Apraxia of Speech: A Performance Continuum
Perceptually Salient Sound Distortions and Apraxia of Speech: A Performance Continuum
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DOI：
10.1044/2017_ajslp-16-0103
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发表时间：
2017-06-01
影响因子：
2.6
通讯作者：
Wambaugh, Julie L.
中科院分区：
文献类型：
--
作者：
Haley, Katarina L.;Jacks, Adam;Wambaugh, Julie L.
目的：研究语音失用症和失语症伴音素性失语患者的发音失真特点，并评价发音失真的错误频率和失真替代在鉴别这两种疾病中的诊断有效性。根据词音节时长将受试者分为两组，作为多音节词发话率的外部标准和可能语音诊断的指标。结果：两组患者均有部分发音和元音舌位改变，辅音方式和位置也有改变。词音节持续时间较长的组产生的失真和扭曲替代错误显著多于词音节持续时间较短的组，但变异分布在表现连续体上，且组间基本重叠。结论：可以用一套定制的变音符号来捕捉左半球局灶性病变的节段扭曲。失真和失真替换的频率是语言失用症的有效诊断标准，但进一步发展量化标准和动态操作谱对于临床应用是必要的。
Purpose: We sought to characterize articulatory distortions in apraxia of speech and aphasia with phonemic paraphasia and to evaluate the diagnostic validity of error frequency of distortion and distorted substitution in differentiating between these disorders.Method: Study participants were 66 people with speech sound production difficulties after left-hemisphere stroke or trauma. They were divided into 2 groups on the basis of word syllable duration, which served as an external criterion for speaking rate in multisyllabic words and an index of likely speech diagnosis. Narrow phonetic transcriptions were completed for audio-recorded clinical motor speech evaluations, using 29 diacritic marks.Results: Partial voicing and altered vowel tongue placement were common in both groups, and changes in consonant manner and place were also observed. The group with longer word syllable duration produced significantly more distortion and distorted-substitution errors than did the group with shorter word syllable duration, but variations were distributed on a performance continuum that overlapped substantially between groups.Conclusions: Segment distortions in focal left-hemisphere lesions can be captured with a customized set of diacritic marks. Frequencies of distortions and distorted substitutions are valid diagnostic criteria for apraxia of speech, but further development of quantitative criteria and dynamic performance profiles is necessary for clinical utility.