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!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags biometricsXsens

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

Cool Tech

Bang and Olufsen Beosound Stage - Dolby Atmos Soundbar

Learn more >

Toys for Boys

Sony WF-1000XM3 Wireless Noise Cancelling Headphones

Learn more >

Nakamichi Delta 100 3-Way Hi Fi Speaker System

Learn more >

ASUS ROG, ACRONYM partner for Special Edition Zephyrus G14

Learn more >

Family Friendly

Mario Kart Live: Home Circuit for Nintendo Switch

Learn more >

Philips Sonicare Diamond Clean 9000 Toothbrush

Learn more >

Stocking Stuffer

SunnyBunny Snowflakes 20 LED Solar Powered Fairy String

Learn more >

Teac 7 inch Swivel Screen Portable DVD Player

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?