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Page last updated at 14:57 GMT, Tuesday, 18 November 2008

Looking for signs of extreme nervousness

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Ten volunteers are challenged with performing a stand-up routine during a week-long experiment for the BBC's Horizon programme. Half of the volunteers have a history of mental disorders and half have not.

The challenge for three mental health professionals is to work out who is who.

Part Two of Horizon: How Mad Are You? will be broadcast on BBC Two on 18 November at 9pm.

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