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tgb comments on Post ridiculous munchkin ideas! - Less Wrong
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A ridiculous munchkin idea which has long been floating around this community is increasingly looking less ridiculous: transcranial direct current stimulation is shown to improve mental arithmetic and rote learning of things like times tables with differences significant even 6 months after training. Original paper.
Has it been demonstrated to be safe over a long period of time?
How can somebody (without access to a lab) practically implement that technique?
The hardware is pretty cheap.
Relevant link from just yesterday: http://hackaday.com/2013/05/28/shocking-your-brain-and-making-yourself-smarter/ :).
Do you know anything about the long term safety of the method?