Table 1.

Brain areas activated for subtraction vs. multiplication (both strategies) and retrieval vs. calculation targets (both operations).

Hemisphere		x	y	z	K	Z
	Subtraction > Multiplication
Left	Superior parietal lobule	−26	−66	60	4,519	4.95
Right	Superior parietal lobule	16	−72	62	1,785	4.45
Right	Middle frontal gyrus	24	−2	48	1,082	4.28
	Multiplication > Subtraction
	ns.
	Retrieval > Calculation
Right	Middle cingulate cortex	6	−40	36	778	4.71
Right	Middle temporal gyrus	62	−46	4	598	4.41
Left	Superior frontal gyrus	−14	56	38	225	4.05
Right	Superior frontal gyrus	16	44	52	160	3.95
Left	Angular gyrus	−50	−60	32	141	3.60
	Calculation > Retrieval
Right	Middle cingulate cortex	10	22	40	710	4.39
Left	Superior parietal lobule	−16	−64	60	1,441	4.26
Right	Superior parietal lobule	26	−62	54	310	3.81
Left	Precentral gyrus	−50	6	26	191	3.81
Left	Superior frontal gyrus	−28	0	70	170	3.75

Statistical parameter maps were thresholded with an initial threshold of p < 0.001 uncorrected, reporting only clusters that survived an family-wise error (FWE)-corrected p-value < 0.05. Coordinates are reported as given by SPM12 (MNI space). k = cluster size, Z = Z value for the maximally activated voxel of the cluster.