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(A) The protocol of MRI acquisition and transcranial alternating current stimulation (tACS) intervention. (B) The montage of stimulation electrodes (drawn by SimNIBS [22]). The yellow one was put on the ipsilesional primary motor cortex, and the blue one is on the contralesional supraorbital ridge. (C) The currents of sham, 10 Hz, and 20 Hz.
