transcranial direct current stimulation (DIY Brain Stimulation)

[IDemo]

TDCS -- The premise: that a contraption composed of nothing more than a 9 volt battery, a voltage regulator and a variable resistor is capable of sending milliamps of current through skin and skull into the brain, providing beneficial (never harmful!) stimulation. Leaving aside that the current path more likely taken between the saline-soaked sponge inputs will be directly between them and across the skin of the scalp, the other questionable claim made by its supporters is that a reversal of voltages ('cathodal' and 'anodal', to use their entirely contrived terms) will result in either suppressing or stimulating the local brain region of interest.

http://www.wired.com/?p=723611&preview_id=723611#comment-1370539445