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How motion capture technology can measure human behaviour

30 August 2010 Last updated at 06:23 BST

Motion Capture technology has become commonplace in Hollywood.

Now the system of digitising actors to create characters in films like Avatar is being used to measure human behaviour in real life.

In an unusual partnership between actors and engineers, researchers at the University of Southern California are developing systems that could help children with autism and couples who are going through marriage therapy.

Peter Bowes met Professor Shri Narayanan, who is running the project, and his team of researchers.