Table 2.

P300 latency, amplitude, and reaction time in pre and post sessions among the investigated groups.

	Anodal group   N = 11	Cathodal group      N = 12	Sham group    N = 11	P value time × groups (anodal vs. sham)	P value time × groups (cathodal vs. sham)	P value time × groups (anodal vs. cathodal)	P value time × groups (anodal/cathodal/sham)
P300 latency (mean ± sd) in ms
Pre-session	379.8 ± 55.6	395.1 ± 64.2	350.5 ± 60.6	0.02	0.03	0.79	0.023
Post 10th session	336.5 ± 49.3	357.9 ± 62.5	371.2 ± 49.4
P value t-test (pre–post sessions)	0.041*	0.034*	0.21
P300 amplitude (mean ± sd) in μv)
Pre-session	10.4 ± 6.5	8.2 ± 3.9	10.7 ±4	0.80	0.89	0.96	0.9
Post 10th session	9.9 ± 4.8	7.8 ± 3.1	9.7 ± 5.4
P value t-test (pre–post sessions)	0.79	0.94	0.72
P300 reaction time (mean ± sd) in ms
Pre-session	569.9 ± 105.8	557.3 ± 71.8	569.7 ± 109.1	0.42	0.13	0.03	0.064
Post 10th session	585.4 ± 128.8	505 ± 72.8	559.5 ± 136.5
P value t-test (pre–post sessions)	0.54	0.016	1

Values in the pre-session and post 10th session are expressed as mean ± SD.

P values are obtained from two way ANOVAs with TREATMENT GROUP_{(anodal, cathodal, and sham tDCS)} as between subject factor and TIME_{(pre-session and post 10th session)} as within-subject factor.

*P < 0.05.