New lie detector relies on full-body suit for better accuracy

Suits normally used by 3D graphics animators could help law enforcement spot lies

When you are hooked up to a polygraph lie detector there is only a 60 percent chance a skilled examiner will spot a lie, giving you pretty good odds to get away with one or two untruths. However, Dutch and British scientists have found a way to amp up the accuracy of lie detection to 75 percent by monitoring a suspect's movements with a full-body suit.

Current lie detection methods aided by polygraphs are only slightly better than what people can achieve on their own. Without a machine, most people can only tell truth from lies about 55 percent of the time.

But when using a full body motion capture suit which records the position, velocity and orientation of 23 points in the subject's body, a better signal of deception can be achieved, according to scientists from the University of Cambridge and Lancaster University in the U.K., and the universities of Utrecht and Enschede in the Netherlands.

For the study, 90 pairs of volunteers were put in MVN motion capture suits from Xsens, a Dutch company that manufactures motion capture suits for professional animators. The suits start at $12,000 and have been used to create animations for movies like X-Men: Days of Future Past and games like Tomb Raider.

The researchers told the volunteers to interview each other and instructed half the volunteers to lie. This process showed that full body motion is a reliable indicator of guilt: the sum of joint displacements was indicative of lying approximately 75 percent of the time.

"Put simply, guilty people fidget more; and this turns out to be fairly independent of cultural background, cognitive load and anxiety -- the factors that confound most other deception detection technologies," said Ross Anderson , professor of Security Engineering at Cambridge University.

What's more, the researchers believe that accuracy can be improved to over 80 percent by analyzing individual limb data and using effective questioning techniques. This year, they are planning to redevelop the method for low-cost commodity hardware and test it in a variety of environments.

"Of course, a guilty man can always just freeze, but that will rather give the game away; we suspect it might be quite hard to fidget deliberately at exactly the same level as you do when you're not feeling guilty," Anderson said.

Loek is Amsterdam Correspondent and covers online privacy, intellectual property, online payment issues as well as EU technology policy and regulation for the IDG News Service. Follow him on Twitter at @loekessers or email tips and comments to loek_essers@idg.com

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection

Tags securitybiometricsXsens

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Loek Essers

IDG News Service
Show Comments

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Ben Ramsden

Sharp PN-40TC1 Huddle Board

Brainstorming, innovation, problem solving, and negotiation have all become much more productive and valuable if people can easily collaborate in real time with minimal friction.

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

David Coyle

Brother PocketJet PJ-773 A4 Portable Thermal Printer

I rate the printer as a 5 out of 5 stars as it has been able to fit seamlessly into my busy and mobile lifestyle.

Kurt Hegetschweiler

Brother PocketJet PJ-773 A4 Portable Thermal Printer

It’s perfect for mobile workers. Just take it out — it’s small enough to sit anywhere — turn it on, load a sheet of paper, and start printing.

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?