Researchers develop alternative lie detector

The researchers’ efforts to commercialise their new technology reached a milestone recently when the University of Utah licensed the technology to Credibility Assessment Technologies (CAT), a company based in Park City, Utah.

Tracking eye movement to detect lies became possible in recent years because of improvements in technology. But the Utah researchers claim to be the first to develop and assess the software and methods for applying these tests effectively.

Using eye movement to detect lies contrasts with polygraph testing. Instead of measuring a person’s emotional reaction to lying, eye-tracking technology measures the person’s cognitive reaction. To do so, the researchers record a number of measurements while a subject is answering a series of true-and-false questions on a computer. The measurements include pupil dilation, response time, reading and rereading time, plus errors.

The researchers determined that lying requires more work than telling the truth, so they look for indications that the subject is working hard. For example, a person who is being dishonest may have dilated pupils and take longer to read and answer the questions. These reactions are often minute and require sophisticated measurement and statistical modelling to determine their significance.