A few years ago I read about the debunking of stage hypnotism and the way stage hypnotists work their crowd to pull off the trick. I just recently wound up in a discussion on the topic due to a Derren Brown prank involving putting someone, unknowingly, into a "catatonic state" with the use of lights flashing from the screen of an arcade game. I quickly dismissed it as fake due to what I have previously read. I have also heard of effecting the nervous system with strobes but from what I understood the frequency and various elements of the strobe had to be just right to work. Now though I can't find anything to really back up my assertions. The only thing I can find are sites that say the nature of hypnosis is up to debate and no one seems to really know. And I can't find anything about strobes in this context either. Does anyone know anything about this or know any good sources? Preferably internet sources because I'm not sure I really want to buy a book on the subject.