The robot that knows when you're lying: Scientists create an AI that can detect deception in the courtroom (and it's already 'significantly better' than humans)

The system, called DARE, was trained by watching 15 videos of people in court

It was trained recognised five expressions that indicate someone is lying

These are frowning, raised eyebrows, lips turning up, lips protruded and head tilt

In a final test, the system performed with 92 per cent accuracy

The researchers describe this performance as 'significantly better' than humans

From a raise of an eyebrow to a tilt of the head, we use several micro-movements when we're lying without even knowing it.

Now, scientists have developed an artificial intelligence system that can detect these micro-expressions and detect if you're lying – and it's already 'significantly better' than humans.

The researchers hope their system could soon be used in courtrooms to tell if people on the stand are telling the truth.

The AI system, called Deception Analysis and Reasoning Engine (DARE), has been developed by researchers from the University of Maryland and Dartmouth College.

To develop DARE, the researchers trained the system using videos of people in the courtroom.

In their study, published in arXiv, the researchers, led by Dr Zhe Wu, said: 'On the vision side, our system uses classifiers trained on low level video features which predict human micro-expressions.'

The team trained the AI to recognise five micro-expressions known to indicate that someone is lying - frowning, eyebrows raising, lip corners turning up, lips protruded and head side turn.

After watching 15 videos from courtrooms, DARE was then tested on whether it could tell if someone was lying in a final video.

Results showed that DARE managed to spot 92 per cent of the micro-expressions, which the researchers describe as a 'good performance.' 

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