tDCS
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Transcranial Direct Current Stimulation (tDCS)
Transcranial Direct Current Stimulation or tDCS is a Non-Invasive Brain Stimulation technique in which a device sends a small Direct Current (DC) derived from a small 9V battery across the scalp to modulate brain function. Electrodes (sponges soaked in salt water) are placed over certain parts of the head.
The electrodes are held in place using a headband. The direct current flows through the electrodes, penetrating the scalp, creating a flow of electrical current in the brain. Usually a slight itching or tingling sensation can be felt on the scalp in the first few seconds. The weak currents enhance brain activity under the site of the electrodes.
What are the effects of tDCS on the brain?
tDCS has a significant effect on neurological activity in the targeted parts of the brain. Each device has an positive and a negative electrode.
Thus, there are two types of stimulation with tDCS – Positive and Negative stimulation.
Positive stimulation acts to excite neuronal activity while Negative stimulation inhibits or reduces neuronal activity.
One of the most important aspects of tDCS is its ability to achieve and cause sustained cortical (brain activity) changes even after the stimulation is ended. The duration of this change depends on the length of stimulation as well as the intensity of current.
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