Table 2.

Typical difference-vectors across subjects, between left and right side for each movement action, and between elbow flexion and key-grip movement actions for each side.

Co-ordinates	X	Y	Z
Left-right side, key grip	83.7	2	2.2
Left-right side, elbow flexion	46.1	2.0	2.4
Elbow-key, left side	-14.8	-2.1	6.1
Elbow-key, right side	22.8	-2.2	5.9

X, Y, Z co-ordinates refer to distances in mm, in Talairach space [21], see Table 1.