Table 3 Basic characteristics, blinding efficacy, and self-reported side effects of participants in experiment 2.

Age(years)

22.71 ± 3.10

21.69 ± 2.28

21.78 ± 2.47

0.149

Education(years)

16.86 ± 2.16

15.98 ± 2.16

16.25 ± 1.98

0.150

Number of correct guesses(active)

40 (95.24%)

41 (97.62%)

36 (90.00%)

Confidence in correct guesses(active)

2.85 ± 0.36

2.76 ± 0.54

2.86 ± 0.42

Number of correct guesses(sham)

1 (2.86%)

1 (2.86%)

1 (2.86%)

Confidence in correct guesses(sham)

3

2

2

Number of correct guesses(uncertain)

1 (2.38%)

0 (0.00%)

3 (7.50%)

Confidence in correct guesses(uncertain)

2

0

2

Itching

8 (19.05%)

6 (14.29%)

6 (15.00%)

Skin redness

0

0

0

Headache

1 (2.38%)

1 (2.38%)

1 (2.50%)

Cervical pain

0

0

1 (2.50%)

Distraction

1 (2.38%)

1 (2.38%)

1 (2.50%)

Acute mood variation

0

0

0

Sleepiness

2 (4.76%)

3 (7.14%)

3 (7.50%)