 tDCS TDCS is an affordable and safe method of brain stimulation which can be broadly used in general population. In tDCS, the cerebral cortex is stimulated through a weak constant electric current 1-2 mA through two electrodes 35 cm2 and 70cm2, an active electrode which targets a special region of brain and a return electrode. This weak current can induce focal changes of cortical excitability that lasts beyond the period of stimulation. In general, Anodal stimulation A-tDCS is supposed to depolarize neurons leading to an increase in excitability, whereas Cathodal stimulation C-tDCS has the opposite effect compared to sham. Sham tDCS S-tDCS refers to a control condition in which the subject will receive a brief current but then the stimulator remains off for the rest of the stimulation time. In this way, the individuals receiving the S-tDCS are not aware that they are not receiving prolonged stimulation.The mechanisms of tDCS effect are classified into synaptic changes by altering the strength of synaptic transmission and non-synaptic shifts in resting membrane potential of pre and post-synaptic neurons. 