Table 2 Adverse effects of tDCS.

From: Augmentation of working memory training by transcranial direct current stimulation (tDCS)

Adverse effect

Sham

Congruent

Incongruent

Kruskal-Wallis

p-value

Tingling (electrode)

2.91 (1.12)

2.96 (0.95)

2.79 (0.98)

X2(2) = 0.40

0.817

Tingling (head area)

1.35 (0.83)

1.25 (0.68)

1.17 (0.48)

X2(2) = 0.33

0.847

Fatigue

1.78 (1.13)

1.71 (1.00)

1.67 (1.01)

X2(2) = 0.04

0.980

Itching

2.13 (1.25)

2.25 (1.26)

2.04 (1.12)

X2(2) = 0.29

0.863

Headache

1.35 (0.65)

1.46 (0.83)

1.33 (0.70)

X2(2) = 0.21

0.900

Nausea

1.17 (0.58)

1.04 (0.20)

1.04 (0.20)

X2(2) = 0.69

0.709

  1. Data are mean values of a 1–5 Likert scale with standard deviations in parentheses.
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