How Blind People Use Echolocation To "See"

Blind from birth, Daniel Kish has pioneered the use of human echolocation to "see" his surroundings.  He produces high-frequency clicks with his tongue, then listens for their echoes.  Depending on how long the echoes take to reach him, and the direction they come from, he is able to detect obstacles.

Daniel and other echolocators have become so adept at this technique that they can ride a bike down the street!  Like bats, humans can be trained to echolocate effectively, often in 2 to 3 weeks.

How blind people use batlike sonar

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