We strapped the headset on for ourselves at a recent event, and we found it to be a weird experience. There was a strange, almost burning, sensation on the right part of our forehead, while the rest merely tingled. Oxley told us that it was normal for some people to feel it more on one side than the other, and that tDCS does take some getting used to. After about eight minutes, the tingling sensation remained even after we removed the headset. We didn't really feel our powers of concentration improve that much afterward, but it's hard to say after such a limited time.

http://www.engadget.com/2013/05/17/focus-headset-tdcs/

%-)

The technique was originally developed to help people with stroke and other brain injuries. It was found to improved cognitive abilities. Just be careful using it with third party batteries from ebay :)

This article discusses the risks:

http://news.nationalpost.com/2013/06/12/transcranial-direct-current-stimulation-tdcs-technology/

There are other types of brain stimulators like Bob Beck's Brain Tuner sold as a Bio Tuner by SOTA. He also published schematics and you can also build it yourself.

http://curezone.com/forums/am.asp?i=924711

If you want something safer, the audio brain stimulator Holosync and Brain Sync uses binaural sound to resync the brain.

http://www.adaringadventure.com/guest-posts/what-is-holosync/

If the two halves of your brain are out of sync, if you listen to a Holosync CD, you can actually "physically" feel the change in your head. You can try it by listening to Kelly Howells brainsync sample ( the first one has no narration) :

http://www.brainsync.com/

https://www.centerpointe.com/

You mean I can get a headache, look like an idiot and potentially cause myself long-lasting impairment all at once? Sign me up.

Brain Synchronization plays an imporant part in overall health. Research has shown that an out of sync brain can lead to disorders such as memory loss, insomnia, autism, depression etc. As far as brain sync audio, results vary like with anything...it may work only when it is needed, which is probably why doctors prescribe something that works faster...drugs!

http://www.newscientist.com/article/mg21328494.600-cant-find-your-keys-your-brains-out-of-sync.html#.UfsV9H6QggY

http://psychcentral.com/news/2012/08/22/brain-hemispheres-out-of-sync-in-schizophrenia/43506.html

http://www.webmd.com/brain/autism/news/20110622/out-of-sync-brain-may-be-a-clue-to-autism

http://journeysonline.org.uk/picks/hate-circuit-depressed-people-out-sync