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Page last updated at 00:41 GMT, Wednesday, 1 July 2009 01:41 UK

Learning to say 'ball'

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Professor Deb Roy of the Massachusetts Institute of Technology (MIT) recorded every movement of his son's waking life over three years to shed light on how babies acquire language.

The Human Speechome Project, as it is known, uses 11 cameras and 14 microphones installed in the scientist's home.

In this footage, his son learns to say "ball".

Footage courtesy of MIT Media Lab.

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