http://patft.uspto.gov/netahtml/srchnum.htm United States Patent 3,951,134 "Apparatus and method for remotely monitoring and altering brain waves " United States Patent 4,395,600 "Auditory subliminal message system and method" "Method and apparatus for generating subliminal visual messages" http://patft.uspto.gov/netacgi/nph-...,616,261.WKU.&OS=PN/4,616,261&RS=PN/4,616,261 and others 4,686,605 - 4,777,529 - 5,017,143 - 5,027,208 - 5,128,765 - 5,134,484 - 5,159,703 - 5,170,381 - 5,175,571 - 5,194,008 - 5,215,468 - 5,221,962 - 5,224,864 - 5,245,666 - 5,270,800 - 5,644,363 - 6,017,302 6,122,322