“It’s Temperature of Nose Rather Than Length That Tells if Person Is Lying: Ultra-Sensitive Infrared Cameras Could Be Alternative to Polygraph”

Frank Munger reports for the Knoxville News Sentinel:

OAK RIDGE – The detection of deception.

A little-known research group in Oak Ridge is developing an alternative to polygraphs, using subtle temperature changes on a person’s face to tell if he or she is lying. Early results are promising.

“We believe this technology that we have evaluated clearly has some excellent utility,” said Jerry Eisele, director of the Center for Human Reliability Studies.

Eisele said the U.S. intelligence community funded the feasibility project, but he declined to be more specific.

The Oak Ridge team tested the technique – infrared thermography – on 40 volunteer participants. In a carefully controlled test setting, participants were asked to take one of several objects from a crime scene and then try to conceal that information from questioners. An armed police officer was stationed in the room to make the interrogation more realistic.

Researchers used an infrared camera capable of detecting temperature changes of 15/1,000ths of a degree. Taking 10 or more picture frames per second, they were able to evaluate slight changes taking place on a person’s face – particularly around the nose, the most responsive area.

The team was able to correctly identify the item in a subject’s possession in about four out of five cases. In about 40 percent of the cases, the evidence was very strong.

The success rate compares favorably with polygraph tests, officials said.

“The polygraph has been around for like 67 years and is the culmination of developments (and) research over that time,” said Don Watkins, coordinator of the Oak Ridge project. “We’ve achieved similar results to the polygraph in two or three years. That is a significant achievement, and I think we can just get better.”

The Center for Human Reliability Studies is part of the Oak Ridge Institute for Science and Education, a U.S. Department of Energy facility.

For the thermography project, the center worked with Oak Ridge National Laboratory, drawing upon ORNL’s expertise in digital imaging, software development and statistical analysis. The research team also included two polygraph specialists, a plastic surgeon and a psychologist.

The polygraph relies on equipment to monitor blood pressure, pulse, respiration and galvanic skin response while a subject answers questions.

Like the polygraph, infrared thermography monitors physiological changes that may be tied to a subject’s stress from deception. However, unlike the polygraph, the technology does not require wires and cuffs and other monitors that may add to the stress level.

“These artificial stressors can compromise results,” the Oak Ridge team said in its research report. “The passive nature of thermal imaging renders this concern moot because it does not require any physical contact with the subject. The level of anxiety created by artificial stressors is thereby reduced or eliminated.”

Polygraph exams are widely used and widely controversial, and the U.S. government is interested in developing alternatives. That was one of the recommendations of a report last year by the National Research Council, which reviewed the scientific validity of polygraphs.

The premise for using infrared thermography is that the human body’s response to deception will leave telltale signs that are detectable in thermal images of the face. It’s anticipated skin temperature will drop as blood capillaries restrict as part of the nervous system’s response.

“The heat from the core of your body cannot get to the skin as fast as it normally will, so your skin should cool when you start to tell a lie,” said Ralph Dinwiddie, a senior research scientist at ORNL’s High Temperature Materials Laboratory.

Watkins said researchers looked at several areas of the face, primarily the forehead, cheeks, nose, around the mouth and the sides of the neck.

The team did two studies. The first effort focused on the technology itself and how it picked up changes in face temperature. The second was to evaluate responses among humans in deceptive situations. Researchers solicited volunteers by posting notices at local institutions, such as Methodist Medical Center and Pellissippi State Technical Community College.

In the thermal images of the face, the areas of most significant temperature change are shown in red. The more stable areas are white or lighter in color.

Some changes are associated with normal activities. For instance, the temperature may change around the mouth just from normal talking. The same is true of the area around the nostrils where respiration repeatedly changes the temperature.

During the early stages of the research, Dinwiddie was testing the infrared camera and various emotional responses. The ORNL scientist focused the camera on Watkins’ face and asked him to think about the day he heard that President John Kennedy had been shot.

“We just a waited a minute or so and looked at the data,” Dinwiddie said. “You could see this big decrease in the temperature of his skin. We said, ‘OK, there’s something here that can really pick up an emotional response.’ “

The Oak Ridge team has submitted proposals to a number of federal agencies to conduct follow-up research and develop the necessary software and data-analysis systems. The technology also would be tested on a larger scale under more diverse conditions.

With sufficient funding, a prototype system could be available within about two years, Watkins said. It could take up to five years to have a system broadly available, he said.

The biggest cost factor is the infrared camera. Current systems cost from $10,000 to $150,000.

“But they’re getting smaller and cheaper all the time,” Dinwiddie said.

At first blush, this thermal imaging lie detector appears to be fraught with all the same methodological shortcomings as CQT polygraphy.

“Non-Invasive Polygraph Technology Based on Optical Analysis”

Optics.org reports on a recent patent application in its “Patent Highlights” feature:

Title: Non-invasive polygraph technology based on optical analysis
Applicant: Defense Group, US
International application number: WO 03/057003
Infrared laser pulses could soon be used to determine whether someone is telling the truth or is under stress. In patent application WO 03/057003, US firm Defense Group describes a non-invasive polygraph machine that fires infrared pulses at the subject. The reflected and scattered pulses are gathered and analysed by a receiver. “The receiver is connected to an information processing device capable of determining various physiological characteristics exhibited by the human subject,” say the authors.