Page last updated at 08:25 GMT, Tuesday, 20 October 2009 09:25 UK

Is that me in the mirror?

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The mirror self-recognition test is used to find out at what age children gain self-awareness.

Professor Vasu Reddy of Portsmouth University explains the test to Professor Marcus du Sautoy for the BBC's Horizon programme.

Horizon: The Secret You is on BBC Two at 2100 BST on Tuesday 20 October or watch afterwards at BBC iPlayer .

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