Effects of three tDCS stimulation conditions on finger-sequence performance. The mean percentage of change in the total number of correct sequential keystrokes across all subjects (N = 16) for sham, uni-hemisphere, and dual-hemisphere tDCS. Error bars signify the standard error of the mean (SEM). Dual-hemisphere tDCS improved finger-sequence coordination for the left hand significantly more than uni-hemisphere or sham stimulation.
Vines et al. BMC Neuroscience 2008 9:103 doi:10.1186/1471-2202-9-103