Table 1.

Summary of behavioral, ERP, and LORETA findings for control (n=20) and depressed (n=20) subjects.

	Control Subjects	MDD Subjects	p-value
A. Behavioral performance
Accuracy incongruent	0.88±0.05	0.85±0.09	n.s.
Accuracy congruent	0.93±0.05	0.93±0.06	n.s.
Stroop effect accuracy	−0.05±0.029	−0.08±0.079	n.s.
RT incongruent	511.61±69.50	561.27±124.15	<0.001
RT congruent	464.14±47.23	470.60±65.54	n.s.
Stroop effect RT	47.47±35.69	90.67±70.29	<0.02
B. Scalp ERP data
N2 incongruent	0.29±0.89	1.31±1.76	<0.001
N2 congruent	0.46±0.93	1.28±1.67	<0.001
N450 incongruent	2.38±1.67	2.91±2.20	<0.001
N450 congruent	2.91±1.60	3.13±2.14	<0.05
C. LORETA data (620 ms)
dACC incongruent	−3.70±0.17	−3.76±0.15	<0.07
dACC congruent	−3.75±0.19	−3.70±0.10	n.s.
Δ(dACC)*	0.05±0.11	−0.06±0.11	<0.005
Left DLPFC incongruent	−3.31±0.17	−3.49±0.28	<0.001
Left DLPFC congruent	−3.36±0.18	−3.39±0.21	n.s.
Δ(left DLPFC)*	0.50±0.13	−0.10±0.18	<0.005

^*The difference score (incongruent - congruent) was calculated at the time of maximal GFP (620 ms) within the N450 time window peak; n.s. = non-significant