Vowel quality in aphasia and apraxia of speech: Phonetic transcription and formant analyses
Vowel quality in aphasia and apraxia of speech: Phonetic transcription and formant analyses
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DOI：
10.1080/02687040143000519
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发表时间：
2001-12-01
期刊：
影响因子：
2
通讯作者：
Wertz, RT
中科院分区：
文献类型：
--
作者：
Haley, KL;Ohde, RN;Wertz, RT
我们研究了失语症和言语失用症的元音质量的声学和知觉特征。20名有和没有言语失用症的失语症患者和10名正常说话者大约产生了24次“hid”和“head”。每一个生产转录与广泛的语音转录，和第一和第二共振峰频率进行了测量，在元音稳定状态的中点。根据语音记录，一些失语症和失读症的人表现出大量的元音替换，而另一些人与正常人没有区别。知觉替换一般接近目标，几乎只影响元音高度，而不是元音前。声学上，失语症组中的几个扬声器显示偏离正常的共振峰模式。偏差模式的性质在失语症患者和失语症患者中各不相同。对于一些人来说，共振峰频率是异常可变的，而另一些人则表现出只是偶尔偏离的模式，还有一些人表现出语音类别的崩溃。研究结果与以往的报告一致，即元音发音定位受损，在许多失语症和失语症的发言者。强调个别发音模式的存在，并指出共振峰分析的静态方法的局限性。
We examined acoustic and perceptual features of vowel quality in aphasia and apraxia of speech. Twenty aphasic speakers with and without apraxia of speech and ten normal speakers produced the words "hid'' and "head'' approximately 24 times. Each production was transcribed with broad phonetic transcription, and the first and second formant frequencies were measured at the midpoint of the vowel steady state. According to the phonetic transcription, some aphasic and apraxic speakers displayed a large number of vowel substitutions, whereas others were indistinguishable from normal speakers. Perceived substitutions were generally close to the target and affected almost exclusively vowel height rather than vowel frontness. Acoustically, several speakers in both aphasic groups displayed a formant pattern that deviated from normal. The nature of the deviation pattern varied across individual aphasic and apraxic speakers. For some, formant frequencies were abnormally variable, whereas others displayed a pattern of only occasional deviations, and yet others demonstrated a collapsing of phonetic categories. The results are consistent with previous reports that articulatory positioning for vowels is impaired in many aphasic and apraxic speakers. The existence of individual articulatory patterns is emphasised, and the limitations of a static approach to formant analysis are noted.