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. 2013 Mar 13;33(11):4634–4641. doi: 10.1523/JNEUROSCI.4706-12.2013

Figure 1.

Figure 1.

Experimental protocol for all groups. Group AA (n = 11) trained Skill A, and then returned the following day for a retention test of Skill A. Group ABA (n = 10) trained Skill A, then immediately trained Skill B, then returned the following day for a retention test. Group BAA (n = 10) trained Skill B first then Skill A, and returned the following day for a retention test. Group R (n = 10) trained a randomized version of the skill task. Training involved practice of each of the skill tasks in four epochs of 30 trials. Group ABA-6HRS (n = 8) trained Skill A and B identical to Group ABA except that a 6 h delay was introduced on the first day between training of Skill A and B. In these groups, MEP amplitudes (black arrows) were measured before and after application of A-tDCS (gray ray). This was assessed on separate days, D0 when there was no training and on D1 after training. To control for the effects of A-tDCS in between training blocks Group Sham-ABA (n = 8) trained on Skills A and B, as done in Group ABA, but with sham tDCS (light gray ray) applied in between training.