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Schematic representation of the study protocol. Resting state functional magnetic resonance imaging (rs-fMRI) was performed 24–48 h prior to inclusion in the double-blind randomized cross-over transcranial direct current stimulation (tDCS) trial. Behavioral signs of consciousness were assessed by means of standardized Coma Recovery Scale Revised (CRS-R) assessments, performed before and directly after the anodal tDCS and sham tDCS sessions.
