Back in 2009 a team of dutch scientists were analyzing the brain. They found that for all the denseness of the
brain doesn't really matter. It does just not as much as they originally thought. Its really about the efficiency of the wired brain. They found that the most intelligent people have the fastest connections not the most
Thus suggests that you may be able to increase your brain performance or boost your intelligence via drugs. It also suggests that by speeding up ANN's (Artificial Neural Networks) may boost the intelligence of the system
In 2011 There were some studies done by Air Force researchers. They found that they could cut training time in half for air force pilots by delivering a mild electrical current (two milliamperes of direct current for 30 minutes).You can read the full article here
There are already a number of consumer products being created to try and take advantage of this discovery and its starting to hit the mainstream. Wired did an article on it "Inside the Strange New World of DIY Brain Stimulation". As well self described biohackers like Tim Ferriss and Dave Asprey are touting the positive effects it has had on them.
Foc.us has released several product geared for gamers. And Fisher Wallace has release a slightly different product to help people treat insomnia
You can check out foc.us here
You can check out Fisher wallace's product here
So I decided to buy one a year ago and test it on myself. I got a cheaper tDCS ApeX Type A from Amazon. It worked great just like I expected. Being a connoisseur of nootropics(aka smart drugs) I usually run a battery of tests on myself to see if they are actually doing anything like the dual and back test. I did notice some improvement in working memory. I am still using it once a week to this day. I do believe I am gaining a benefit from it.