Vowel Formant Dispersion Reflects Severity of Apraxia of Speech.
Vowel Formant Dispersion Reflects Severity of Apraxia of Speech.
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DOI：
10.1080/02687038.2017.1385050
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发表时间：
2018
期刊：
影响因子：
2
通讯作者：
Fridriksson J
中科院分区：
文献类型：
--
作者：
den Ouden DB;Galkina E;Basilakos A;Fridriksson J
言语失用症（AOS）与辅音起始时间（VOT）的偏差有关，但元音声学的研究却得出了相互矛盾的结果。然而，不受语音类别约束的言语运动规划障碍预计会影响元音和辅音的发音。我们测量了大样本中风幸存者产生的辅音VOT和元音共振峰，并评估这些变量及其离散度在多大程度上预测AOS的存在和严重程度，基于一个量表，该量表使用临床观察来评估AOS、失语症和构音障碍的梯度存在。从53名卒中幸存者中收集图片描述样本，包括未受损的说话者（12名）和主要失语的说话者（19名），失语伴AOS（12名），主要AOS（2名），失语伴构音障碍（2名），失语伴AOS和构音障碍（6名）。前三个共振峰是从开放类单词中承载主重音的元音标记中提取的，以及用于浊塞音和清塞音的VOT。元音空间的估计反映在共振峰集中率。逐步线性判别分析被用来预测组成员，和有序回归预测AOS的严重程度，根据这些变量的绝对值，以及共振峰和VOTs内的扬声器的标准差。AOS的存在和严重程度与F1、F2和快速停止VOT的离散度最一致。这些语音声学测量与失语症的严重程度无关。这些结果证实，AOS影响发音全面，并没有选择性地备用元音生产
Apraxia of Speech (AOS) has been associated with deviations in consonantal voice-onset-time (VOT), but studies of vowel acoustics have yielded conflicting results. However, a speech motor planning disorder that is not bound by phonological categories is expected to affect vowel as well as consonant articulations. We measured consonant VOTs and vowel formants produced by a large sample of stroke survivors, and assessed to what extent these variables and their dispersion are predictive of AOS presence and severity, based on a scale that uses clinical observations to rate gradient presence of AOS, aphasia, and dysarthria. Picture-description samples were collected from 53 stroke survivors, including unimpaired speakers (12) and speakers with primarily aphasia (19), aphasia with AOS (12), primarily AOS (2), aphasia with dysarthria (2), and aphasia with AOS and dysarthria (6). The first three formants were extracted from vowel tokens bearing main stress in open-class words, as well as VOTs for voiced and voiceless stops. Vowel space was estimated as reflected in the formant centralization ratio. Stepwise Linear Discriminant Analyses were used to predict group membership, and ordinal regression to predict AOS severity, based on the absolute values of these variables, as well as the standard deviations of formants and VOTs within speakers. Presence and severity of AOS were most consistently predicted by the dispersion of F1, F2, and voiced-stop VOT. These phonetic-acoustic measures do not correlate with aphasia severity. These results confirm that the AOS affects articulation across-the-board and does not selectively spare vowel production
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影响因子：
2
作者：
Haley, KL;Ohde, RN;Wertz, RT
通讯作者：
Wertz, RT
影响因子：
2.5
作者：
Haley, KL;Overton, HB
通讯作者：
Overton, HB
DOI：
10.1044/jshr.2602.231
发表时间：
1983-01-01
期刊：
JOURNAL OF SPEECH AND HEARING RESEARCH
影响因子：
--
作者：
KENT, RD;ROSENBEK, JC
通讯作者：
ROSENBEK, JC
影响因子：
1.2
作者：
Kent, RD;Kim, YJ
通讯作者：
Kim, YJ
影响因子：
2.5
作者：
BLUMSTEIN, SE;COOPER, WE;GOTTLIEB, J
通讯作者：
GOTTLIEB, J