Very interesting.

My first reaction was like Peter's - you can't HEAR that stuff, so it doesn't matter if it exists or not. If a note is played in the forest but it's inaudible, it doesn't matter if there is anybody there to hear it.

The brain wave thing is interesting, but I'm not sure it's compelling. Even if your ears are transmitting a signal to your brain at those frequencies (a claim of which I remain dubious), that doesn't necessarily mean that you are PERCEIVING those signals.

bibere usque ad hilaritatem