Table II.

Activations in Study 2 on contrast between grating orientation discrimination and grating spacing discrimination

Site	x	y	z	tmax
Orientation > spacing
L FEF	−22	−14	52	5.4
R FEF	26	−12	50	4.1
L PMv	−39	−3	35	3.7
R PMv	42	−3	32	3.3
R PCS	35	−32	40	4.8
L alPS	−29	−43	46	4.1
L POC	−15	−70	31	2.9
Spacing > orientation
R AG	40	−62	42	3.4

For extensive activations, the locus of the peak is identified (x, y, z Talairach coordinates of peak).

FEF, frontal eye field; PMv, ventral premotor cortex; PCS, postcentral sulcus; aIPS, anterior intraparietal sulcus; POC, parietooccipital cortex; AG, angular gyrus.