Extracting Unknown Crime Information by Psychophysiological Responses

本研究的目的是拓宽隐性信息测验作为知识发现工具的应用范围。日本警方使用CIT有两个目的。首先，通过证明嫌疑人对犯罪有事实知识来识别犯罪者，其次，从嫌疑人那里获得新的信息以帮助调查人员，也称为搜索CIT（sCIT）。原则上，向受试者提出一个问题，然后给出多个合理的答案，同时记录生理指标。测试遵循一个简单的逻辑，如果你没有犯罪的知识，所有的答案产生相同的反应，但如果你知道真相，正确的答案将引起一个升高的反应相比，其余的。在这个项目中，我专注于扩大sCIT。具体来说，我打算研究的刺激相似性的答案之间的替代品的影响。我这样做是通过检查，如果答案类似于正确的答案引起较大的反应各自的相似程度。此外，我检查，如果传统的一套不同的答案的替代品可以应用到连续的刺激，如路线和maps.The项目的结果是直接适用于在日本使用的CIT的做法。这些发现可以帮助CIT从业者更好地理解如何选择答案替代方案，以最大限度地提高CIT的检测准确性，并且它们可以允许从业者在传统sCIT难以使用的情况下使用sCIT，例如使用城市地图找到被盗物品的位置。

The purpose of this research project is to broaden the application of the Concealed Information Test (CIT) as a knowledge detection tool. The CIT is used by the Japanese police for two purposes. First, to identify perpetrators by demonstrating that a suspect has factual knowledge about a crime, and second, to elicit novel information from a suspect to aid the investigators, also known as searching CIT (sCIT). In principle, the examinee is presented with a question followed by multiple plausible answers while physiological indices are recorded. The test follows a simple logic, if you have no knowledge of the crime all answers produce the same response, but if you know the truth, the correct answer will elicit an elevated response compared to the rest.In this project I focus on expanding the sCIT. Specifically, I intent to examine the effects of stimulus similarity among the answer alternatives. I do so by examining if answers similar to the correct answer elicit larger responses respective to their degree of similarity. Furthermore, I examine if the traditional set of distinct answer alternatives can be applied to continuous stimuli, such as routes and maps.The results of this project are directly applicable to the CIT practices used in Japan today. The findings could help CIT practitioners to better understand how answer alternatives should be selected to maximize the detection accuracy of the CIT and they may allow practitioners to use the sCIT in situations that are difficult for the traditional sCIT, such as finding the location of a stolen item with a map of the city.