Nasal Blood Flow in the Concealed Information Test

Abstract

The present study measured blood flow to the nose tip during a concealed information test (CIT), which examines whether an examinee recognizes crime-relevant information. Twenty participants received two CITs. They recognized a crime-relevant item in one of the two CITs. The nasal blood flow was lower for the recognized crime-relevant item than for the crime-irrelevant ones. The time course of the nasal blood flow differed from that of the fingertip blood flow that is one of existing CIT indices. Furthermore, the nasal blood flow significantly discerned whether each participant recognized the crime-relevant item. These results indicate that nasal blood flow can be a new index for the CIT.