Is it possible? Nanoparticles can cross the blood brain barrier. We basically have no information about how nano quantities of materials will interact with our brain. We DO know that silver causes cells to rupture. Is our only answer to mend the damage by regrowing new brain cells? How do we get something so small out of all the nooks and crannies of our head? We may not have the technology to do so yet, but we might as well start talking about it now.
http://www.sciencedaily.com/releases...0822194530.htm