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This is the VOA SpecialEnglish SCIENCE REPORT.
Scientists say they have developed a camera that can helpidentify when a person is not telling the truth. The new camerameasures the heat released by a person's face.
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| Lyingeyes (bottom) give off increased heat |
The scientists say the cameracorrectly identified lying in more than eighty percent of the peoplethey tested. They say the device might one day be used in high-levelsecurity operations at airports or border crossings.
James Levine of the Mayo Clinic in Rochester, Minnesota led thestudy. Nature magazine reported the findings.
The scientists based their work on the theory that people whoplan to trick someone release physical or chemical signals. They saythese signals can help security officials prevent wrongdoing.
The Mayo Clinic researchers worked with scientists at HoneywellLaboratories to develop the new, heat-imaging technology. DoctorLevine says the camera is designed to measure small changes in thebody. He notes that the flow of blood to the surface of the skinincreases around the eyes when a person lies.
The scientists used twenty people to test the heat-sensingcamera. Eight of the people took part in a crime that was not real.They attacked a human-like object and stole money from it. They wereasked to lie and say they were innocent of the crime. The twelveother people in the study were told nothing about the make-believecrime.
The researchers used the special camera while questioning thetwenty people about the crime. The camera showed that six of theeight people who carried out the crime had increased heat aroundtheir eyes when they lied. Eleven of the twelve people who knewnothing about the crime were correctly identified as innocent. Whenthey told the truth, the area around their eyes remained cool.
The researchers say the rate of success of the test was similarto the current polygraph method of lie detection. Polygraph testsmeasure changes in heart rate, breathing and the wetness of aperson's skin.
However, a polygraph test requires a person willing to be tested.And it takes time and skill to examine the results. Lie detectionexperts say the new camera could be used without suspects knowingthey are being watched. The researchers say more testing anddevelopment of the device are needed.
This VOA Special English SCIENCE REPORT was written by GeorgeGrow.