http://www.polygon.com/2013/7/30/4571066/this-headset-shocks-the-brain-to-improve-your-gaming
The headset, which recently passed FCC certification but has yet to receive the approval of the FDA, sits on the forehead for five to 10 minutes and uses transcranial direct-current simulation — a low current of small electrodes — to stimulate the front part of the brain, or the prefrontal cortex. According to the product's website, the gentle dose of electrodes may improve cognitive functions and short-term memory. The shocks are said to "overclock" the brain and help neurons fire faster, helping gamers process those lightning-fast mid-combat decisions and pushing them to pull the trigger or attain their goal more efficiently.