Table 4.

Regions activated by the effort contrast (increased signal to anticipation of smaller response cost)

Region	Max z score	Peak voxel (in mm)
		x	y	z
Left putamen	4.04	−28	−2	−4
Right putamen	3.69	26	0	−6
Left SMA/cingulate motor area	4.78	−6	−8	58
Right SMA/cingulate motor area	3.89	4	−2	54
Left primary motor cortex	4.75	−34	−22	60
Left midbrain	3.16	−8	−20	−10