Timeline of Events. Each test period (blue) lasted about 15 min. Training (green) lasted approximately 1 h. Immediate and delayed tests were separated by 1 h. The Attention Networks Test (ANT; orange) was administered immediately before the delay test and lasted approximately 20 min. TDCS (red) was administered starting 5 min before training and lasted for a total of 30 min. Participants were asked to indicate the amount of tDCS-induced sensation that was present at three time points (1, 5 and 20 min after start of tDCS administration).
Coffman et al. BMC Neuroscience 2012 13:108 doi:10.1186/1471-2202-13-108