Nottingham Trent University, Nottingham, UK.
University of Cambridge, Cambridge, UK.
Q J Exp Psychol (Hove). 2023 Dec;76(12):2804-2822. doi: 10.1177/17470218231155738. Epub 2023 Mar 7.
Voice identification parades can be unreliable due to the error-prone nature of earwitness responses. UK government guidelines recommend that voice parades should have nine voices, each played for 60 s. This makes parades resource-consuming to construct. In this article, we conducted two experiments to see if voice parade procedures could be simplified. In Experiment 1 ( = 271, 135 female), we investigated if reducing the duration of the voice samples on a nine-voice parade would negatively affect identification performance using both conventional logistic and signal detection approaches. In Experiment 2 ( = 270, 136 female), we first explored if the same sample duration conditions used in Experiment 1 would lead to different outcomes if we reduced the parade size to include only six voices. Following this, we pooled the data from both experiments to investigate the influence of target-position effects. The results show that 15-s sample durations result in statistically equivalent voice identification performance to the longer 60-s sample durations, but that the 30-s sample duration suffers in terms of overall signal sensitivity. This pattern of results was replicated using both a nine- and a six-voice parade. Performance on target-absent parades were at chance levels in both parade sizes, and response criteria were mostly liberal. In addition, unwanted position effects were present. The results provide initial evidence that the sample duration used in a voice parade may be reduced, but we argue that the guidelines recommending a parade with nine voices should be maintained to provide additional protection for a potentially innocent suspect given the low target-absent accuracy.
由于耳证人反应的易错性，语音识别列队可能不可靠。英国政府指南建议，语音列队应由九个声音组成，每个声音播放 60 秒。这使得列队的构建需要大量资源。在本文中，我们进行了两项实验，以确定是否可以简化语音列队程序。在实验 1（n=271，女性 135 人）中，我们使用传统逻辑和信号检测方法，研究了减少九人列队中语音样本的持续时间是否会对识别性能产生负面影响。在实验 2（n=270，女性 136 人）中，我们首先探讨了在实验 1 中使用相同的样本持续时间条件，如果我们将列队大小减少到仅包含六个声音，是否会导致不同的结果。在此之后，我们将两个实验的数据合并起来，以研究目标位置效应的影响。结果表明，15 秒的样本持续时间导致的语音识别性能与更长的 60 秒样本持续时间在统计学上等效，但 30 秒的样本持续时间在整体信号灵敏度方面存在劣势。使用九人和六声音列队都复制了这种结果模式。在两个列队大小中，目标不存在的列队的表现都处于随机水平，响应标准大多宽松。此外，还存在不需要的位置效应。这些结果初步证明，在语音列队中使用的样本持续时间可以缩短，但我们认为，鉴于目标不存在的准确性较低，建议使用九个声音的列队的指南应得到维持，以对潜在无辜的嫌疑人提供额外的保护。
