2008 Volume 10 Issue 2 Pages 141-148
The purpose of the present study is to investigate whether functional near-infrared spectroscopy (fNIRS) can be used as a new psychophysiological index for detection of deception. After completing a mock crime task,14 graduate and undergraduate students participated in a Guilty Knowledge Test (GKT). During the GKT, change in oxyHb level in the prefrontal cortex area was measured by fNIRS. As a result, the increase in the oxyHb level induced by the critical question of the GKT was higher than that induced by the non-critical question. This difference in the oxyHb level detected the lies in the GKT with 91%accuracy. The present study indicates that the fNIRS measurement can detect lies as good as conventional psychophysiological indexes such as respiration, blood pressure, pulse wave, or electrodermal activity.
