2019 年 45 巻 1 号 p. 26-34
The concealed information test (CIT) is a forensic psychophysiological method that allows for the detection of memories that are related to criminal activity. This study examines whether suspects have participated in or have intention to take part in a terror attack. A total of 48 students were invited to participate. Participants in the "intention group" were asked to confirm the terror target with a map and photograph, and those in the "execution group" placed a simulated explosive at the target on the map. Each participant then completed two CITs. Results showed that the average skin conductance response to the critical question regarding the target photograph was significantly larger than that to non-critical items for both groups. Additionally, only participants in the execution group could distinguish the type of bomb used. These findings suggest that it is possible to differentiate between groups through the use of a critical item known only to those who have executed the crime. This information could be used to distinguish between suspects who participated directly or tangentially in a terrorist act.