Table 3.

Peak coordinates from factorial analysis of Arithmetic Operation, Diagnostic Group and Interactions. All activation peaks were assigned to the most probable brain areas as indicated by the SPM Anatomy Toolbox (Eickhoff et al., 2005, 2007).

Macroanatomical Location	Cytoanatomical Location (Probability)	Brodmann’s Area	Peak MNI Coordinates			Peak F Statistic	Volume (voxels)
			x	y	z
A. Main Effect of Arithmetic Operation
Addition > Subtraction
Left superior temporal gyrus	OP 1(40%)	42	−52	−30	12	24.03	109
Subtraction > Addition
Right inferior/superior parietal lobe, intraparietal sulcus	Area 2 (40%)	40	36	−42	46	18.73	149
Right supramarginal gyrus	PFt (40%)	40	48	−34	48	16.03	82
Anterior cingulate		32	0	22	40	14.71	117
Left intraparietal sulcus	hIP1 (40%)	40	−38	−52	46	13.56	67
B. Main Effect of Diagnostic Group
Controls > Dyslexia
Left supramarginal gyrus	PF (70%)	40	−56	−40	34	15.37	36
Dyslexia > Controls
n.s.
C. Interaction: Diagnostic Group x Arithmetic Operation
Right supramarginal gyrys	PFm (80%)	40	48	−46	52	11.48	69