Table 2.

Determination of the reference region.

		Talairach coordinates			MNI coordinates			Reference coordinates
Study	Method	x	y	z	x	y	z	x	y	z
Grafton et al., 1993	PET	−22	−22	60	−22	−17	65	−16.6	−17.8	65.8
Lotze et al., 2000	fMRI	−28	−24	64	−28	−19	69	−28.0	−24.6	70.0
Alkadhi et al., 2002	fMRI	−29	−25	61	−29	−20	66	−28.3	−24.3	62.9
		−29	−26	62	−29	−21	67	−28.0	−24.6	70.0

Left: Talairach coordinates of maximum activation during right elbow movements. An MNI-to-Talairach transformation (Lancaster et al., 2007) was applied to convert Talairach to MNI coordinates (Radua and Mataix-Cols, 2015). Finally, the reference coordinates, i.e., the closest points in the source space to the MNI coordinates, were calculated.Right: Reference region mapped onto the cortex surface of the ICBM152 template, i.e., the source space for source localization.