טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentTal Yonatan
SubjectNon Intrusive Speedy Lie Detection
DepartmentDepartment of Industrial Engineering and Management
Supervisor Professor Eldad Yechiam
Full Thesis textFull thesis text - English Version


Abstract

The present study describes and evaluates a new method for detecting lies. The method assesses Autonomic Nervous System (ANS) activation based on changes in Peripheral Arterial Tone (PAT) at the fingertip. In two experimental studies participants had the opportunity to win monetary prizes if they succeeded in lying in target questions presented by a computer without being detected. In Experiment 1 participants were asked to indicate the names of their relatives and friends as well as their own name, and in Experiment 2 they were asked questions about past behaviors. Significant enhanced arterial vasoconstriction, indicating autonomic arousal, was evident post lie in comparison to truth responses. The results showed that for 83% of the participants in Experiment 1 and for 81% in Experiment 2, the differences between lies and truthful responses were detected using the current technique. In both studies the PAT was found to be more sensitive than an index of arousal measured through the same device (Heart Rate).

The findings of the study imply that the PAT should be considered as a member in the "family" of measures employed in modern polygraphs. It may also serve to complement the current polygraphic techniques in more limited settings where there are time constraints, such as in mass screening facilities.