Limitations
itching, prickling
Although there was no significant difference between groups before stimulation, inter-individual variation in performance could nonetheless contribute to our findings. A further potential limitation is that participants reported significantly more itching and prickling during active than Sham stimulation. These side-effects may have influenced performance to some degree. However, since the frequency of the side-effects did not differ between CB-TDCS and M1-TDCS, side-effects cannot explain why a detrimental effect on performance only occurred during CB-TDCS. The finding raises the question, however, as to whether the current standard of blinding [