The Basics

Simple Explanation
When a DC current is applied over the scalp with the intention of altering neuronal activity, it is known as transcranial DC stimulation. tDCS is effective in adjusting neuronal firing. tDCS at intensities of 1-2 milliamp applied for roughly 10-20 minutes 3 times per week, has been shown to either excite or inhibit the sensori-motor cortex, with the effects lasting over an hour. Excitation is achieved by anodal (+) RED stimulation, while inhibition is achieved by cathodal (-) BLACK stimulation. Anodal stimulation has also been shown to increase both beta and gamma activity in the visual cortex, while cathodal stimulation has decreased beta and gamma activity. Stimulation is generated by putting an electrode over the brain function region to be treated and the other electrode on the shoulder. The recommended tDCS sessions of 20 minutes delivering a maximum intensity of 2.20 milliamps vdc.

Electrode Placement and Maintenance–There are many montages, electrode placements for treatment. Search the internet for “tDCS montage for (your issue)”. Most treatments are about exciting an area of function and others are about reducing overactive areas.  Maintain good connections, adhesive or pressure, to skin and use a solution for hairy areas such as saline solution, gel or plain water depending on the electrode type.

Saline solution is a 1 quart clean container w/lid, 1 level teaspoon of non-iodized salt (pickling salt), 1 level teaspoon of baking soda, 1 quart distilled water.  Grind salt and baking soda together and stir/shake until solution mixes.

Electrodes too close to the eyes can cause harmless flashes of light.  Move the electrode away from eyes.

Measure your head and use cranial measurements to determine areas of your brain functions.
See Brain Function Maps on Research page or watch this  http://www.youtube.com/watch?v=IwGIF5aCnqg

Description of tDCS

http://en.wikipedia.org/wiki/Transcranial_direct-current_stimulation

General Discussion

http://www.diytdcs.com

http://www.scribd.com/doc/85132877/Tdcs-Basic-Info

http://brmlab.cz/project/brain_hacking/tdcs