"Although beyond the scope of current research, Khizroev's nanoparticle system may offer a new way to interact with...

"Although beyond the scope of current research, Khizroev's nanoparticle system may offer a new way to interact with computers. He hasn't tried it yet, but he says running it in reverse, so that the nanoparticles produce a measurable magnetic field in response to the brain's own electrical fields, is possible. Our brain states would then become input parameters for computers, which would be able to directly stimulate specific regions of the brain in return."

http://www.newscientist.com/article/dn27676-20-billion-nanoparticles-talk-to-the-brain-using-electricity.html
http://www.newscientist.com/article/dn27676-20-billion-nanoparticles-talk-to-the-brain-using-electricity.html