This study applies an acoustic–phonetic approach to examine the variability in 30 speakers’ face vowel productions over three semi-spontaneous speaking tasks that utilise different interlocutors. The aim of this research is to establish how much within-speaker variability is present across a range of forensically-relevant scenarios. These underpinning observations are subsequently evaluated in order to consider the extent to which accommodation could impact forensic speaker comparison (FSC) casework. The face vowel is of particular interest as it is said to have high levels of variation in West Yorkshire English speech and appears to be socially salient in this region. After measuring within-speaker variability and Euclidean distances between interlocutors, an evaluation of how robust face is to the influence of varying speech styles and interlocutors was undertaken. Applying a broad definition of accommodation to capture both of these elements, results indicate that face is influenced by accommodation for many speakers. However, the extent to which speakers adapt their face productions is highly variable across individual speakers, both in terms of the direction and amount of accommodation observed. The implications of these findings are addressed from both a FSC casework perspective and also in terms of sociolinguistic research practices more generally.

这项研究采用声学方法研究了使用不同对话者的三个半自发性说话任务中30位说话人的面部元音作品的变异性。这项研究的目的是确定在与法医相关的各种场景中，发言人内部的变异性是多少。随后对这些基础观察进行评估，以考虑调解可能会影响法医演说者比较（FSC）案例工作的程度。的脸元音特别令人感兴趣，因为据说它在西约克郡英语语音中的变化程度很高，并且在该地区似乎在社会上很重要。在测量了发言者内部的变异性和对话者之间的欧几里得距离之后，进行了一个评估，评估了面部表情对变化的演讲风格和对话者的影响有多强健。应用适应性的广泛定义来捕获这两个元素，结果表明，许多说话者的面部都会受到适应性的影响。但是，说话者适应面部的程度各个演讲者的作品在观看的方向和容纳量方面都存在很大差异。从FSC案例研究的角度以及社会语言研究实践的角度更广泛地论述了这些发现的含义。