Transcranial Direct Current Stimulation (tDCS) and Motor Training for Traumatic Brain Injury (TBI) Survivors

The aim of this study is to compare the effect of transcranial direct current stimulation and functional upper extremity task training to functional upper extremity task training alone. The functional upper extremity task training uses the Armeo Spring robotic arm to support the limb while playing functional task games on a computer. Specific Aims: 1. To demonstrate that tDCS combined with upper extremity functional task training in a virtual environment is more effective than functional task training in a virtual environment with sham tDCS. 2. To compare cortico-excitatory changes following training with tDCS vs. sham stimulation, using paired- and single-pulse transcranial magnetic stimulation as a tool to measure cortical excitability.