Migraine with aura is a severe headache preceded by symptoms such as seeing flashing lights, temporary visual loss, speech problems or numbness of the face.

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Blinkx uses speech recognition, visual analysis and scene change detection, which enable a more accurate search as well as the ability to search within videos for specific words or people.

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But audio experts say that the basic principles the CIA uses are likely the same ones that have driven the field of voice recognition since the 1940s: use of a spectrogram, a visual representation of the frequencies of human speech.

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The project draws on expertise in speech recognition and in computer vision - ways of capturing visual data - which have been a strength of Cambridge and the Toshiba lab in particular.

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For many years, he has promoted speech input, stylus-based computing and, with Surface, visual recognition.

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For those who are unfamiliar with the concept, a word cloud is a visual representation of the most frequently used words in a given document or, in this case, a speech.

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These figures of speech can be quite useful in taking complicated or abstract concepts and making them more understandable in tangible, visual ways.

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