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How the blind use clicks to ‘see’: study

PARIS: Just as bats bounce sound waves off objects to find their way in the dark, some blind humans spontaneously make clicking sounds with their mouths to navigate the world, scientists said Wednesday. Not only that, but they adjust the speed and volume of the clicks when they need to zoom in on a hard-to-place object. "Even though people have not been 'designed' to echolocate, they have adapted their brains extraordinarily well to detect faint echoes and to instinctively adjust emissions as the task changes," said…