Martin Ward, deputy general secretary of the Association of School and College Leaders, said school and college leaders knew that exams in all subjects were not equal.

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The bottom three quarters of all their test subjects were ranked as low as the lowliest spammer.

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Many of the characteristics of the actual frequencies in the recordings - such as the central and peak frequencies, and the variability of the frequencies within each laugh - were similar across all the subjects.

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"It felt to me that they were all dealing with the same subjects, " he says.

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In a recent paper in the Proceedings of the National Academy of Sciences, Ms Peleg describes filming 21 interviews with people who have been blind since birth, and 30 interviews with normal-sighted people, all of whom were genetically related to her blind subjects.

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At the end of the two weeks, subjects from both groups were assessed again and all those who had done the HIT programme finished 10% faster than they had the time before.

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With tact and care, the movie digs into all the subjects that lay concealed below the surface when Max Ophuls and Douglas Sirk were filming their own melodramas in the nineteen-fifties.

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