TABLE 3.

Comparison of P300 indexes at each time point between the two groups.

Groups	Time	P300 amplitude (ms)	P300 latency (uV)
Sham group (n = 20)	Before treatment	4.01 ± 1.51	336.00 ± 31.31
	After 5 days of treatment	4.58 ± 1.70	334.00 ± 34.32
	4 weeks after completion of treatment	4.49 ± 1.64	329.25 ± 42.62
tDCS group (n = 20)	Before treatment	3.66 ± 1.44	332.25 ± 26.13
	After 5 days of treatment	7.36 ± 1.95**ΔΔ	277.25 ± 28.54**ΔΔ
	4 weeks after completion of treatment	7.26 ± 1.83**ΔΔ	276.40 ± 26.75**ΔΔ

Data are presented as mean ± standard deviation (x ± s). Compared with before treatment: 1, **P < 0.01; Compared with sham group: ^ΔΔP < 0.01.