Table 1.

Typical center-of-mass for peak activations in healthy controls, for each action.

	Primary activation [mm in Talairach space (21)]					Secondary activation [mm in Talairach space (20)]
	X	Y	Z	SD	Atlas location	X	Y	Z	SD	Atlas location
Left key grip	40.1	-21.8	50.6	3.5	Primary motor/pre motor	-16.8	-50.8	-16	2	Cerebellum, left V
Right key grip	-43.6	-23.7	48.4	3.8	Primary motor/somatosensory	15.95	51.65	-17.9	2.4	Cerebellum, right V
Left elbow flexion	25.23	-23.9	56.7	4	Primary motor/pre motor	-15.05	-51.6	-16	4.6	Cerebellum, left V
Right elbow flexion	-20.85	-25.95	54.3	3.3	Primary motor	15.2	-51.7	-16.15	1.3	Cerebellum, right V

X, Y, and Z: stereotaxic coordinates according to Talairach (21): negative X-values = left side, Y-values = posterior, Z-values = inferior.