When a DC current is applied over the scalp with the intention of altering neuronal activity, it is known as transcranial DC stimulation ( tDCS) and has been found to be effective in modulating spontaneous neuronal firing. Implementing tDCS at intensities of 1 milliamp applied for roughly 10 minutes has been shown to either excite or inhibit the sensori-motor cortex, with the effects lasting over an hour. Excitation is achieved by anodal (+) stimulation, while inhibition is achieved by cathodal (-) 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 a wet cloth, cotton ball or sponge on the scalp over the brain region to be treated and a sponge or cotton ball on the shoulder or the face. The tDCS sessions deliver a maximum intensity of 2.35 milliamps at DC. tDCS is being used for the treatment of many conditions, including depression.
CAUTION: tDCS is very powerful and if applied incorrectly, can result in negative side effects. Therefore, the sessions for tDCS will only be released to qualified clinicians. Read Dave's tDCS Article for more information. Click here for information and images on Brodmann Area
Transcranial DC Stimulation: Physiology and Clinical Applications
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