Discussion:
The findings of the current study indicated that applying a-tDCS (1 and 2 mA) and also 2 mA c-tDCS improved online motor learning compared to the 1 mA c-tDCS and sham tDCS groups, with more significant effects of a-tDCS (1 and 2 mA). Moreover, the lasting effects of motor learning are also shown in a-tDCS (1&2 mA) and 2 mA c-tDCS groups. Additionally, the results indicated that 1 mA c-tDCS can disturb both online and offline motor learning.