Edgar J D, Sapienza C M, Bidus K, Ludlow C L
Department of Communication Disorders, School of Allied Health Professions, Louisiana State University Health Sciences Center, New Orleans 70112-2262, USA.
J Voice. 2001 Sep;15(3):362-72. doi: 10.1016/S0892-1997(01)00038-8.
Speech of patients with abductor spasmodic dysphonia (ABSD) was analyzed using acoustic analyses to determine: (1) which acoustic measures differed from controls and were independent factors representing patients' voice control difficulties, and (2) whether acoustic measures related to blinded perceptual counts of the symptom frequency in the same patients. Patients' voice onset time for voiceless consonants in speech were significantly longer than the controls (p = 0.015). A principle components analysis identified three factors that accounted for 95% of the variance: the first factor included sentence and word duration, frequency shifts, and aperiodic instances; the second was phonatory breaks; and the third was voice onset time. Significant relationships with perceptual counts of symptoms were found for the measures of acoustic disruptions in sentences and sentence duration. Finally, a multiple regression demonstrated that the acoustic measures related well with the perceptual counts (r2 = 0.84) with word duration most highly related and none of the other measures contributing once the effect of word duration was partialed out. The results indicate that some of the voice motor control deficits, namely aperiodicity, phonatory breaks, and frequency shifts, which occur in patients with ABSD, are similar to those previously found in adductor spasmodic dysphonia. Results also indicate that acoustic measures of intermittent disruptions in speech, voice onset time, and speech duration are closely related to the perception of symptom frequency in the disorder.
采用声学分析方法对痉挛性外展性发音障碍（ABSD）患者的语音进行分析，以确定：（1）哪些声学指标与对照组不同，并且是代表患者语音控制困难的独立因素；（2）声学指标是否与同一患者症状频率的盲态感知计数相关。患者语音中清辅音的起音时间显著长于对照组（p = 0.015）。主成分分析确定了三个占方差95%的因素：第一个因素包括句子和单词时长、频率变化以及非周期性情况；第二个因素是发声中断；第三个因素是起音时间。发现句子中的声学干扰测量值和句子时长与症状的感知计数存在显著关系。最后，多元回归表明声学指标与感知计数密切相关（r2 = 0.84），其中单词时长相关性最高，一旦排除单词时长的影响，其他指标均无贡献。结果表明，ABSD患者出现的一些语音运动控制缺陷，即非周期性、发声中断和频率变化，与先前在痉挛性内收性发音障碍中发现的缺陷相似。结果还表明，语音间歇性干扰、起音时间和语音时长的声学指标与该疾病症状频率的感知密切相关。
