Online stimulation of the prefrontal cortex during practice increases motor variability and modulates later cognitive transfer: a randomized, double-blinded and sham-controlled tDCS study.

c-tDCS group showed comparatively lower improvements than the s-tDCS group in accuracy interference reduction after the intervention trending towards significance (Fig. 6 a), Brunner-Munzel t (41.83) = −1.93, p = 0.06, δ = 0.32 (medium).

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TMT-B In this subtest measuring cognitive flexibility, faster completion times were exhibited by the c-tDCS group compared to s-tDCS group although this difference did not reach statistical significance (Fig. 4 c), Brunner-Munzel t (41.49) = 1.89, p = 0.07, δ = 0.31 (medium).

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