![]() ![]() 4, 5 This approach is based on the fact that the act of lying can cause increased autonomic arousal. The most widespread objective method for assessing veracity is multichannel physiological recording, commonly known as the polygraph or lie detector. Because human beings can be very skilled at lying 1, 2 and, in general, are poor at determining when they are being lied to, 1– 3 scientific, objective methods for determining truthfulness have been sought for decades. Outside the legal system, detection of deception is also of critical importance in the corporate world and in the insurance industry, as illustrated by the practice of hiring private investigators to follow and videotape disability claimants. ![]() Falsification or lying by any of these parties can and does occur. A wider dialogue within the medical, neuroscientific, and legal communities would be optimal in promoting the responsible use of this technology and preventing abuses.Įssential to the working of modern legal systems is an assessment of the veracity of the participants in the process: litigants and witnesses, victims and defendants. Commentators have already begun to weigh in on many of these questions. This new ability to peer inside someone's head raises significant questions of ethics. ![]() But would it work in the real world? Despite some significant concerns about validity and reliability, fMRI lie detection may in fact be appropriate for certain applications. The new approach promises significantly greater accuracy than the conventional polygraph-at least under carefully controlled laboratory conditions. Neuroscientists are now applying a 21st-century tool to an age-old question: how can you tell when someone is lying? Relying on recently published research, two start-up companies have proposed to use a sophisticated brain-imaging technique, functional magnetic resonance imaging (fMRI), to detect deception. ![]()
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