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wedrifid comments on DIY Transcranial Direct Current Stimulation. Who wants to go first? - Less Wrong
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So, can I get the benefit of this stuff by getting a 9v battery, wiring it to my head and maybe adding some salt water for conduction? Or does it require a different voltage?
There doesn't seem to be too much risk. The threshold for damage is higher than the threshold for pain, at least from what I can understand.
http://www.reddit.com/r/tDCS/comments/jo4or/please_be_careful/