Acquisition of concrete and abstract words is modulated by tDCS of Wernicke's area.

Following this up with two separate analysis for each assessment day, we found the main effect of stimulation on the second (but not the first) day of assessment at the level of near-significant tendency (F (2; 69) = 2.944; p = 0.059; ηp 2 = 0.079), with higher accuracy for abstract words in anodal tDCS than in sham group, albeit only at tendency level (p = 0.091; Z = − 2.2) (Fig. 5 ).

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Furthermore, following corrections for multiple comparisons, this effect approached significance on Day 2 for abstract semantics in both tasks, although diverging between stimulation polarities.

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