Table 3.

Summary of unpaired t-tests assessing behavioral performance in subjects with relatively low vs. high dACC activation 620 ms post-conflict. For the dACC cluster, a difference score was calculated (incongruent - congruent). Stroop effects were calculated as: (RT_{Incongruent trials} – RT_{Congruent trials}) and (Accuracy_{Congruent trials} – Accuracy_{Incongruent trials}).

	Stroop Effect RT	Stroop Effect Accuracy
MDD subjects
Low ACC (n = 10)	139.86±67.73a,b,c	−0.11±0.09d,e,f
High ACC (n = 10)	41.49±21.65a	−0.04±0.04d
Control subjects
Low ACC (n = 10)	38.86±34.19b	−0.05±0.03e
High ACC (n = 10)	56.09±36.81c	−0.05±0.03f

Sub-groups differ at:

^ap<0.001

^bp<0.003

^cp<0.003

^dp<0.04

^ep<0.05

^fp<0.05