A recent paper published in the Journal of Medical Ethics warns of the dangers of DIY transcranial direct current stimulation (tDCS). The National Post reports:
Those risks include reversing the polarity of the electrodes to cause impairment instead of benefit, and triggering potentially long-lasting and negative changes to the brain’s biology, the researchers argue in the Journal of Medical Ethics. […]
In fact, Health Canada considers tDCS machines to be class-three devices — on a scale of risk ranging from one to four — and has yet to approve any for treating psychological illness – though they are licensed for pain and insomnia therapy, said Leslie Meerburg, a department spokeswoman. […]
One subtle but troubling risk could lie in the ability of the devices to change behaviour, with research by Prof. Fecteau and colleagues suggesting tDCS can actually make people better liars, or less empathetic, both qualities that could encourage unscrupulous conduct.
Amusingly, after citing a researcher who says tDCS could make people better liars and less empathetic, the Post quotes someone selling a home tDCS rig saying that it is “very safe.” But, despite the somewhat sordid tone of the story, the actual paper Medical Ethics paper does say that tDCS is “relatively safe.” You can find the full paper here.