Alright, that human echolocation was pretty incredible. I've heard about blind people feeling where they are from the air pressure, but not this. I'm not sure, but from what I've heard, bats have a sophisticated system which from the bat's perspective might seem entirely different from vision. I'm guessing that in the humans' cases, they're getting a mental image in their brain like when we imagine things.
In a psychology class we learned about an experiment involving kittens, in which some kittens were born and lived for a few weeks in a room with lines on the walls. There were 2 such rooms with 2 different groups of kittens. One had horizontal stripes, the other had vertical stripes. After being removed from the rooms, the kittens from the horizontal-stripe room had difficulty seeing things that were vertical, and vice versa. When a researcher tried to play with a kitten from the vertical-stripe room, using a horizontal toy, the kitten had difficulty reacting to it.
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