Transcranial direct current stimulation (TDCS)
TDCS was applied by a two channel electrical stimulator (NeuroStim 2, Medina Teb, Iran) using four saline-soaked (NaCl 0.9%) sponge electrodes. The electrode size was 35 cmA tDCS-induced electrical fields (EFs) were estimated with a free and open source software package for simulation of non-invasive brain stimulation (SimNIBS v.3.2.3)