Table 2. Region of interest analyses.

	Region
Contrast	CG	RCZa	RCZp	preSMA
Inc - Con (Conflict)	-1.26 (n.s.)	4.21 (**)	4.80 (***)	1.42 (n.s.)
Switch - Control (Switch)	1.13 (n.s.)	5.73 (***)	8.87 (***)	8.04 (***)
Error - Correct (Error)	3.69 (*)	7.39 (***)	8.95 (***)	6.21 (***)
Switch - Conflict	1.73 (n.s.)	4.14 (**)	5.10 (***)	7.41 (***)
Error - Conflict	4.34 (**)	5.88 (***)	6.45 (***)	5.33 (***)
Error - Switch	2.65 (+)	2.94 (*)	2.51 (+)	0.81 (n.s.)

T-statistics (d.f. = 26) for each contrast within regions of interest.

CG = cingulate gyrus

RCZa = anterior rostral cingulate zone

RCZp = posterior rostral cingulate zone

preSMA = pre-supplementary motor area

n.s. – not significant (p > 0.05)

⁺p < 0.05

^*p < 0.01

^**p < 0.001

^***p < 0.0001