Look up Dr. Eldon Taylor and his research with subliminal technology. He also has a patented technology called Whole Brain and in doing research you will see how his subliminal programs work, also call "unsubliminals" and why others fail to even have the messages even regsiter in the mind. His subliminals are the only ones that i trust and received good results from two programs that i've used. A couple are available for free.
He is in the forefront of subliminal technology and research. You can find downloadable books and articles on the site
www.innertalk.com or
www.mindmint.com.I hope you will find some interesting information which i know you will! Good luck in your research.