At the end of the stimulation period we found a significant beneficial effect of A-tDCS as compared to baseline and S-tDCS in all our subjects, regardless of word difficulty, although with some inter-individual differences. In the follow-up period, the percentage of correct responses persisted significantly better until the 16th week, when an initial decline in naming performance was observed. Up to the 21st week, the number of correct responses, though no longer significant, was still above the baseline level. These results in a small group of aphasic patients suggest a long-term beneficial effect of on-line A-tDCS.

via Frontiers | LONG-TERM EFFECTS OF TRANSCRANIAL DIRECT CURRENT STIMULATION IN CHRONIC POST-STROKE APHASIA: A PILOT STUDY | Frontiers in Human Neuroscience.