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Spanish speaking shepherds, 'Silbadors', have used the wistled language Silbo for centuries on the Spanish Island of La Gomera, communicating through wistling rather than the spoken word.
Scientists from the University of La Laguna used a scanner and found that it involves the use of the same areas of brain normally devoted to understanding conventional speech.
Dr David Corina of the University of Washington/Seattle says that the findings show how areas of the brain dedicated to language can also be used for other forms of non-verbal communication.
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