Healy Eric W, Montgomery Allen A
Department of Communication Sciences and Disorders, University of South Carolina, Columbia, SC 29208, USA.
J Speech Lang Hear Res. 2007 Apr;50(2):270-82. doi: 10.1044/1092-4388(2007/020).
To examine the extent to which sentences retain their levels of spoken intelligibility relative to other sentences in a set (the sentence effect) across different types of signal distortion.
The Central Institute for the Deaf (CID) sentences were rendered difficult to understand through the addition of broadband noise. These intelligibility data were compared with those from previous studies in which the sentences were distorted through filtering and visual-only conditions of speechreading. The extent to which the various sentences retained their intelligibility rankings was examined using an analysis of variance model and by correlating individual sentence means across conditions.
The sentences accounted for a large portion of the variance, and individual sentence scores were highly correlated across conditions involving a single distortion type. However, correlations were lower when conditions involving noise were compared with those involving filtering. Surprisingly, correlations across auditory distortions were almost identical to those observed across auditory and visual modalities. These comparisons, reflecting the consistency of sentence difficulty independent of presentation characteristics, accounted for approximately 25% of the variance in sentence-recognition performance.
There exists a sentence effect that holds across various types of signal distortion, but the strongest form is restricted not only within modalities but within particular forms of distortion.
研究在不同类型的信号失真情况下，句子相对于一组中的其他句子保持其口语可懂度水平的程度（句子效应）。
通过添加宽带噪声使中央聋人研究所（CID）的句子难以理解。将这些可懂度数据与之前研究中的数据进行比较，在之前的研究中，句子通过滤波和仅视觉的唇读条件而失真。使用方差分析模型并通过关联不同条件下的单个句子均值，来研究各种句子保持其可懂度排名的程度。
句子占方差的很大一部分，并且在涉及单一失真类型的条件下，单个句子得分高度相关。然而，当将涉及噪声的条件与涉及滤波的条件进行比较时，相关性较低。令人惊讶的是，听觉失真之间的相关性与在听觉和视觉模态之间观察到的相关性几乎相同。这些比较反映了句子难度的一致性，与呈现特征无关，约占句子识别性能方差的25%。
存在一种跨越各种类型信号失真的句子效应，但最强的形式不仅限于模态内，还限于特定的失真形式内。
