Table 1.

Means and standard error of mean (SEM) for accuracy and speed on 2-back visual working memory outcome measures

		Active stimulation		Sham stimulation		Statistics within a group	Statistic Between group
		Pre-tDCS	Post-tDCS	Post-tDCS	Post-tDCS
Accuracy	Anodal left/ Cathodal right/	6.7±1.8	6.2±1	6.8±2	7.2±1.1	0.007a	0.082
	Cathodal left/ Anodal right	6.7±0.9	7.1±0.9	7.6±1	6.9±0.9	0.623
Speed	Anodal left/ Cathodal right	232±74	174±41	202±47	152±10	n.t.	n.t.
	Cathodal left/ Anodal right	242±95	180±20	236±15	174±10	n.t.

n.t., not tested; statistic between groups is independent samples t test electrode positioning. Statistics within a group are paired samples t test post active versus post sham tDCS.

^aP>0.05.