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Be careful though: http://www.bbc.co.uk/news/health-27343047
but it does seem like there's alarmingly little understood about the long term affects of tDCS yet, with the manufacturers themselves even being quite blunt about how little they understand about this further than the fact that the studies to date show positive results and were run under sensible conditions (not one of those paid-for studies that's set up to succeed no matter what).
Gaming nerds don't care about that though: http://www.reddit.com/r/tDCS
It does seem to offer an easier to apply and less expensive alternative to comparative devices. As suggested more research is needed, although no significant risks are known at this time.
will be interesting to see the long term affects on the nerds, but it's the other uses that are far more interesting