What is Saline Solution, and why do I need it for tDCS?
Saline solution is a simple mixture of salt and water which is soaked into sponge electrodes for tDCS. Plain water in and of itself is a very poor conductor of electric current. However, by adding salt to the water, electric current can “jump” across the salt molecules, helping to form a complete connection. By using salt water (saline) with your sponges, you greatly increase the conductivity of the sponge electrodes. When using saline soaked sponges, individuals often find that the session is not only more effective, but more comfortable as well. Often the tingling or “itching” sensation, which may be experienced when sponges are soaked with ordinary water, can be lessened or even removed completely if replaced with saline soaked sponges.