大学院紀要 = Bulletin of graduate studies

In Japanese criminal investigations, police officers conduct a polygraph test in order to judge whether the suspects tell the truth or lie on the basis of their several peripheral nervous reactions. Peripheral nervous reactions have roots in central nervous reactions. Therefore, functional brain imaging techniques are also useful to detect lies or concealments. Near infrared spectroscopy has great advantages than other techniques when we apply it to real criminal investigations. NIRS device is highly portable and costs relatively lower. Moreover, NIRS is less sensitive to motion artifacts than fMRI. In this sturdy, I examined the possibility of NIRS to detect concealments of the information about a fictional crime. Eight participants read a scenario about a fictional crime and memorized the details of it. Then, they were asked to conceal the details. During concealments, cerebral blood flow reactions of their prefrontal regions were measured with NIRS. My results showed that the concentrations of oxygenated hemoglobin significantly increased during concealments. In contrast, the concentrations of oxygenated hemoglobin did not increased during not concealments. These results suggests the possibilities of applying NIRS to polygraph test in real investigations.

501 学内論文 ＞ 紀要 ＞ 大学院紀要＝Bulletin of graduate studies ＞ 79