Sure blind people echolocate. Why do you think they tap the metal tip
of their canes on the ground all the time? I've read a blind writer's
description, too, of "sound shadows," by which he can tell where
someone is standing because ambient noise from that direction is
partially blocked. An interested experiment that demonstrates that our
brains filter out a lot of potential information that is irrelevant to
us, but not to blind people: If a tape recording is made of someone
walking down a hallway and played backward, the echoes of his
footsteps from the end wall of the hall are obvious, because they come
before the steps, not after. Played forward, sighted people have
"learned" not to hear them, because there's no need to. They can see
the end wall.--Bill
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