tDCS on Precuneus in MCS: Repeated Stimulations

In this study researchers will apply transcranial direct current stimulation (tDCS) for 5 consecutive days in chronic patients in minimally conscious state (MCS).

Positive effects of tDCS in patients in MCS was showed in a recent study published in Neurology. But the effects went down after 1 or 2 hours. To increase the lasting of the effects, a new study will evaluate the effects of tDCS on the precuneus cortex for 5 consecutive days in chronic patients in MCS. 2 sessions of 5 days of stimulation will be realized, one session will be real (anodal stimulation) and one placebo (sham stimulation). After each stimulation, behavioral improvement will be assessed with the Coma Recovery Scale Revised (CRS-R). A final assessment will be done 5 days after the end of the sessions to assess the long term effect of the tDCS. Researchers expected to see an improvement of the CRS-R total score at the end of the anodal session and that this improvement persists for 5 days.