title: Single-trial lie detection using a combined fNIRS-polygraph system.
abstract: Deception is a human behavior that many people experience in daily life. It involves complex neuronal activities in addition to several physiological changes in the body. A polygraph, which can measure some of the physiological responses from the body, has been widely employed in lie-detection. Many researchers, however, believe that lie detection can become more precise if the neuronal changes that occur in the process of deception can be isolated and measured. In this study, we combine both measures (i.e., physiological and neuronal changes) for enhanced lie-detection. Specifically, to investigate the deception-related hemodynamic response, functional near-infrared spectroscopy (fNIRS) is applied at the prefrontal cortex besides a commercially available polygraph system. A mock crime scenario with a single-trial stimulus is set up as a deception protocol. The acquired data are classified into "true" and "lie" classes based on the fNIRS-based hemoglobin-concentration changes and polygraph-based physiological signal changes. Linear discriminant analysis is utilized as a classifier. The results indicate that the combined fNIRS-polygraph system delivers much higher classification accuracy than that of a singular system. This study demonstrates a plausible solution toward single-trial lie-detection by combining fNIRS and the polygraph.
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University Busan, South Korea.
authors.forename: M Raheel
authors.initials: MR
authors.lastname: Bhutta
authors.affiliation: FIRST 5 Santa Clara County San Jose, CA, USA.
authors.forename: Melissa J
authors.initials: MJ
authors.lastname: Hong
authors.affiliation: Department of Physical and Rehabilitation Medicine, Center for Prevention and Rehabilitation, Heart Vascular and Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Samsung Advanced Institute of Health Sciences & Technology, Sungkyunkwan University Seoul, South Korea.
authors.forename: Yun-Hee
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University Busan, South Korea ; School of Mechanical Engineering, Pusan National University Busan, South Korea.
authors.forename: Keum-Shik
authors.initials: KS
authors.lastname: Hong
keywords: combined fNIRS-polygraph system; deception; hemoglobin change; linear discriminant analysis; physiological responses; single-trial lie detection