TABLE 2.

N1 amplitude values at occipital OZ, O1, and O2 electrodes and P3 amplitude values at parietal PZ, P1, and P2 electrodes during Angle task and Color task

	Test 1	Test 2	Test 3	P1	P2	t 1	t 2
N1 amplitude (μV)
Angle task
OZ electrode	−6.59 (2.32)	−2.93 (1.83)	−6.12 (2.31)	0.001	0.644	5.534	0.644
O1 electrode	−6.65 (2.80)	−2.95 (1.46)	−5.54 (2.79)	0.003	0.249	4.032	1.231
O2 electrode	−9.60 (3.59)	−3.44 (1.74)	−7.82 (3.15)	0.001	0.647	5.931	1.505
Color task
OZ electrode	−6.32 (2.92)	−2.93 (1.46)	−6.09 (2.30)	0.001	0.840	5.468	0.208
O1 electrode	−5.93 (3.79)	−2.91 (1.59)	−5.40 (2.31)	0.029	0.640	2.591	0.484
O2 electrode	−9.29 (4.00)	−3.34 (1.04)	−7.34 (3.13)	0.001	0.240	0.354	1.258
P3 amplitude (μV)
Angle task
PZ electrode	10.19 (2.31)	5.86 (1.56)	9.84 (3.32)	0.001	0.794	4.969	0.268
P1 electrode	10.20 (2.02)	6.01 (1.10)	10.28 (3.52)	0.001	0.961	5.769	0.050
P2 electrode	10.26 (2.30)	5.63 (1.40)	10.41 (3.43)	0.001	0.918	5.964	0.105
Color task
PZ electrode	4.91 (2.21)	2.68 (1.28)	3.37 (3.39)	0.009	0.276	3.312	1.159
P1 electrode	4.88 (2.02)	2.59 (1.10)	3.68 (3.52)	0.017	0.405	2.917	0.873
P2 electrode	5.98 (1.96)	2.61 (2.04)	4.15 (3.41)	0.001	0.252	4.930	1.225

P1: Test 2 versus Test 1; P2: Test 3 versus Test 1; t 1: Test 2 versus Test 1; t 2: Test 3 versus Test 1. Data are shown as mean (SD).