Looking for tiny facial tics from opponents has been used by poker players for decades as a way to spot a bluff, but now Chinese scientists are using the same technique to develop a lie detector.
They have created an online polygraph that uses facial recognition to study minute changes in facial expression, skin colour, temperature and heart rate - all of which could reveal a lie.
The machine is also fitted with artificial intelligence to analyse visual and voice data to look for such changes that indicate someone is not being truthful.
Scientists in China have developed a polygraph that combines artificial intelligence with facial recognition. It assesses changes in facial expression, skin colour, temperature as well as voice to spot if someone is telling the truth or not. A picture of an earlier prototype AI facial recognition system in use is shown above
Traditional lie detectors rely upon detecting changes in a person's pulse, breathing rates and skin conductivity, but these all require someone to be fixed up to sensors.
By contrast, the facial polygraph can be used without contact, raising the prospect of individuals having their truthfulness tested without them realising it.
Cameras for the device look for tiny changes in facial expression, changes in colour which indicate changes in heart rate, and fluctuations in temperature as blood flow changes.
The researchers behind the system claim it would be particularly useful in overcoming the problems faced when conducting polygraphs on people who have been trained to defeat them.
Researchers said their system overcomes many of the problems of traditional polygraph tests (reconstruction pictured) and can be used without physical contact. By using cameras and voice detection, it means people can have their truthfulness tested without being aware they are being assessed by the system
It has been developed by researchers at the Chongqing Institute of Green and Intelligent Technology at the Chinese Academy of Sciences, the Shanghai Jiao Tong University and a company called Cloudwalk.
Dr Zhou Xi, chief executive of Cloudwalk and a scientist at the Chongquing Institute who led the project, said: 'Traditional polygraphs usually use a contact sensor to detect blood pressure, pause and muscle activities of the targets, but sometimes it doesn't work on people who have received professional training.
'The advantage of our new polygraph is the non-contact detector, which will lower the vigilance of targets.'
'It can work in both daylight and dark environment, and offer more accurate test results,'
Dr Zhou said the new polygraph hinges around artificial intelligence technology that uses five different types of 'recognition modules' to assess if someone is being truthful or not.
It uses intelligent decision making to recognise changes in facial expression, voice, semantic structure, physical posture and morphology.
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