Table 1.

Within and between-group brain activation for letter and category fluency.

	Location (approximate Brodmann area)	Mean Intensityd	Cluster Volume	Talairach coordinates
				x	y	z
Letter Fluency
ASDa
	L middle frontal G. (9)	0.26	6208	−41	15	25
Controla
	L middle frontal G. (9)	0.30	6016	−42	9	31
ASD > Control b
	R frontal (44)	0.39	7808	49	14	7
	R inferior frontal G. (45)			48	25	7
	R superior temporal G. (22)			54	7	4
ASD > Control c
	R frontal (44)	0.41	2176	50	11	4
	R inferior frontal G. (45)	0.38	1024	46	24	11
Category Fluency
ASDa
	L insula	0.20	4992	−30	19	11
	L inferior frontal G (9)	0.36	1920	−50	10	29
	L medial frontal G.	0.36	1664	−4	1	52
Controla
	L middle frontal G. (46,9)	0.29	14272	−44	17	26
	L inferior frontal G (45)			−37	26	5
	L medial frontal G. (32)	0.23	1792	−6	3	54
Control > ASD b
	L middle frontal G. (8)	−0.5816	13760	−42	23	44
ASD > Control c
	R inferior frontal G. (47)	0.50	4672	52	19	−3
	L inferior frontal G. (44)	0.33	2176	−55	3	17
	L medial frontal G.	0.22	1600	−10	−15	51
Control > ASD c
	L middle frontal F. (8)	−0.525	5248	−42	23	44
Category > Letter Fluency
Controlb
	Bilateral lingual gyrus (18)	−0.4552	51648	−10	−87	−14
	Bilateral cuneus (18)			−2	−94	6
	Bilateral medial frontal G.	−0.4958	20928	−9	53	8
	Left inferior frontal G.			36	−39	1
	Left middle frontal G.			44	−47	4

Note. Talairach coordinates for other brain areas within the cluster are listed separately and italicized.

^aVoxel height p < .005, α = .05 (cluster volume corrected)

^bVoxel height p < .05, α = .05 (cluster volume corrected)

^cResults for ASD and controls groups matched on handedness. Voxel height p < .05, α = .05 ( uncorrected).

^dIntesity values correspond to the mean percent signal change between the task and control blocks.