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Polarity Dependent Modulation of the Motor Region Using tDCS: A Proton MR Spectroscopy Study
Rajakumar Nagarajan1, Anant Shinde2,3, Muhammed Enes Gunduz2,3, and Gottfried Schlaug2,3
1Human Magnetic Resonance Center, Institute for Applied Life Sciences, University of Massachusetts Amherst, Amherst, MA, United States, 2Biomedical Engineering, University of Massachusetts Amherst, Amherst, MA, United States, 3Baystate Medical Center, University of Massachusetts Medical School, Springfield, MA, United States
We studied the effects of motor region tDCS on metabolite levels in a spectroscopic voxel with repeated  5min of constant current dose. This study provides insights into how tDCS leads to polarity dependent modulation of metabolites and might provide a model for future MRS stimulation studies. 
Figure 1. Experimental setup: a) electrode placement and stimulator modes; b) setup for applying tDCS inside the MR scanner; and c) 45 minutes of tDCS-MRS scanning protocol timing diagram
Figure 3. Short term and Cumulative effect of GABA and Glx with respect to Creatine changes of Anode and Cathode