I think these guys need to get together with the guys that have already proven that we have our own internal sonar, like bats. They say they walked in silence and it wasn't echo location, But if they walked down a hall there would be footsteps. Our ears are able to gauge the echo of our movement. Our brain in turn is able to calculate (by the sound of your footsteps let's say and the echo they give off of solid objects) how close you are to that object.
For instance, if you closed your eyes or blindfolded yourself and walked down a solid floor towards a wall. As you walked, by listening to the echo of your footsteps and the change in the sound of them as you got closer to the wall, you would be able to tell when you were to close to the wall. I tried it and its pretty cool.
But, there has to be a sound. You have to be making noise for it to work. Sonar is using echo location and if your not making any noise there's no echo and it doesn't work so well. Like carpet its harder to tell and it becomes more of just like a 'feeling' before you hit the wall. I would be interested to see if this plays a part in their studies or what would happen if they combined. Interesting stuff anyway. And anyone reading this should try what I described. It works you can definitely hear a change in the sound of your footsteps as you get closer to the object. You could train your brain to concentrate on that better, put on some tap shoes and walk around town. Although still doesn't give you a direction. Just tells you if your too close to something.
So yeah, you - me we all have built in echo location. So if your ever walking in the dark, listen to the sound of your footsteps and it might help you not hit your shin on that coffee table.
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