In the fields of face recognition and voice recognition, a growing literature now suggests that the ability to recognize an individual despite changes from one instance to the next is a considerable challenge. The present paper reports on one experiment in the voice domain designed to determine whether a change in the mere style of speech may result in a measurable difficulty when trying to discriminate between speakers. Participants completed a speaker discrimination task to pairs of speech clips, which represented either free speech or scripted speech segments. The results suggested that speaker discrimination was significantly better when the style of speech did not change compared to when it did change, and was significantly better from scripted than from free speech segments. These results support the emergent body of evidence suggesting that within-identity variability is a challenge, and the forensic implications of such a mild change in speech style are discussed.

在面部识别和语音识别领域，越来越多的文献表明，尽管从一个实例到另一个实例的变化，识别个人的能力仍然是一个巨大的挑战。本文报道了语音领域的一项实验，该实验旨在确定仅语音风格的变化是否可能导致在尝试区分说话者时出现可测量的困难。参与者完成了对语音片段对的说话者辨别任务，这些语音片段代表自由语音或脚本化语音片段。结果表明，说话者的辨别力在语言风格不变时要比在改变时明显更好，并且根据脚本撰写要比根据自由语音片段进行辨别要好得多。