The effects of pre-viewing of mock crime scene on detection of deception using P300 after one month and one year

本研究旨在测试在进行基于P300的有罪知识测验(GKT)之前对模拟犯罪细节的刷新记忆是否会在实验室环境下提高GKT的准确性。以P300波幅为因变量，以情境依赖记忆效应(中枢记忆与外周记忆)和GKT服药时间(模拟犯罪后一个月与一年)为自变量。模拟犯罪包括进入一个房间，从五个书桌抽屉中的一个(中央存储器)中偷走一枚戒指。在戒指旁边，有一层文具(外围记忆)。这两个项目被用作GKT中的关键项目，大约在模拟犯罪发生后一个月或一年实施。在GKT之前，刷新记忆(RM)组观看了一盘录像带，描述了他们模拟犯罪的房间，而非RM(NRM)组的参与者观看了一盘相同长度的录像带，描述了学院其他部分的场景。无论记忆操作和GKT给药的时间间隔如何，这两个关键项目都引起了显著更大的P300波幅。这些结果表明，以P300为因变量，GKT的现场应用是可行的。

The present study was designed to test whether refreshing memory of mock-crime details prior to administration of a P300-based guilty knowledge test (GKT) would enhance GKT accuracy in a laboratory setting. P300 amplitude was used as a dependent variable while context-dependency memory effect (central vs. peripheral memory) and periods of GKT administration (one month vs. one year after a mock-crime) were manipulated as independent variables. The mock-crime involved entering a room and stealing a ring from one of five desk drawers (central memory). Beside the ring there was a dip of stationery (peripheral memory). These two items were used as critical items in the GKT that was administered approximately one month or one year after the mock-crime. Prior to the GKT, the refreshing-memory (RM) group viewed a videotape that depicted the room in which they had committed the mock crime, while the participants in the no-RM (NRM) group viewed a videotape of the same length that depicted scenes from other parts of the college. Both the critical items elicited significantly larger P300 amplitudes regardless of the memory manipulation and gaps in time of the GKT administration. These results suggest that the field applications of the GKT may be feasible, with P300 as the dependent variable.