NIce to see this technology discussed here. I've used various devices over the years but found meditation to be superior in creating higher states of cognition. Nonetheless I'm fully in support of researching these technologies. I still have my original Bob Beck Brain Tuner he gave me back around 1985, I think of it more as a museum piece than a tool. But it still works (just a potted 555 timer chip) even though it does have the "science fair" look to it.
P.S. that isaac asimov post above is a robot, I've gotten the same post immediately after posting, and I've seen it on others. If you notice is has a -6 rating. One starts to notice these things after a while.