Neurophysiological and Behavioral Effects of Combining Transcranial Direct Current Stimulation (tDCS) and Modified-Constraint Induced Movement Therapy (mCIMT)

This clinical trial aims to evaluate the effect of different types of tDCS modulation with mCIMT in improving affected upper-limb motor function for stroke patients. The main question it seeks to answer: Which type of tDCS (bi-hemispheric, anodal, or cathodal) combined with the mCIMT program leads to greater improvement in affected upper-limb function in patients with stroke? Researchers will compare these three types of tDCS to a sham tDCS. To see which kind of tDCS protocol combined with the mCIMT program will be more effective in improving affected upper-limb function for stroke patients. Participants will: 1. Participants will receive 12 sessions of mCIMT combined with tDCS or mCIMT alone. 2. Visit the clinic three times a week for four weeks. 3. Participants will do fMRI and TMS before and after the program and three times of assessment before and after two weeks after the program.