I think the non-sensationalist term is binaural beat. http://www.psychologytoday.com/blog/you-20/201007/i-dosing-digital-drugs-and-binaural-beats http://en.wikipedia.org/wiki/Binaural_beats I think a visual analogy might be those magic-eye pictures...er...I mean "Teens susceptible to visual cortex hacking"! Regards, Michael Skeggs