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Page last updated at 07:34 GMT, Wednesday, 25 April 2012 08:34 UK

The influence of TV test cards


Test cards have been used since the earliest television broadcasts and many people will have fond or frustrating memories of the test card girl and a clown playing noughts and crosses.

Now, the Institute of Contemporary Arts in London is exploring how test cards and their music affected the television watching public.

The Today programme's Nicola Stanbridge has been listening to the theories.

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