Quote Originally Posted by Shift View Post
a hospital? lol

I dunno, seems quite ballsy to me to start screwing with your head like that. I wouldn't do it unless I knew precisely what I was doing, which I don't. I'm cautious about things like this though, I don't even like the idea of binaural beats because I have no idea what they are actually doing or if the person who made it was qualified to screw with my head
"One prior stumbling block to using ultrasound noninvasively in the brain has been the skull. However, the acoustic frequencies utilized by Tyler and his colleagues to construct their pulsed ultrasound waveforms, overlap with a frequency range where optimal energy gains are achieved between transcranial transmission and brain absorption of ultrasound - which allows the ultrasound to penetrate bone and yet prevent damage to the soft tissues. Their findings are supported by other studies examining the potential of high-intensity focused ultrasound for ablating brain tissues, where it was shown that low-frequency ultrasound could be focused through human skulls."

- http://www.news-medical.net/?id=42266


I doubt that low frequency ultrasound is dangerous, some people already use it with their electric toothbrushes.

Ultrasound is just sound that is higher in frequency than what the human ear can hear.

Dogs, cats and other animals can hear ultrasound.