국립과학수사연구원
National Forensic Service, Wonju, Korea
The purpose of this study is to investigate the difference in P3 amplitude between relevant questions (RQ) and irrelevant questions (IRQ) during concealed information test using event-related potential. Response difference between guilty group, not-guilty but exposed to crime-related information group, and not-guilty and not exposed to crime-related information group are compared. A total of 126 subjects’ data has been analyzed out of 131 subject data. Data from 5 subjects has been discarded due to inadequacy. Ultimately, in each of the 3 groups, 42 participants are randomly assigned. Result indicated that the P3 amplitude observed in the Fz area showed a significant difference between the RQ and the IRQ among the guilty group. However, remaining groups of the two not-guilty groups did not show a significant difference in all areas of Fz, Pz, and Cz between the RQ and the IRQ regardless of the exposure of the crime-related question. The limitation and the implications are discussed in this article. (Korean J Str Res 2015;23:101∼107)