Electrode tip positions and stimulation profiles were as follows

Lesion position	Stimulation profile
Lesion 1:
(a) 11 mm posterior to FM	2 Hz	Motor response hand, face	5.5 V
13 mm lateral to midline	50 Hz	Sensory response cheek, hand	5 V
		Driving dystonia hand and torticollis	7 V
(b) 14mm posterior to FM	2 Hz	Motor response
13mm lateral		Hand	5 V
		Neck	6 V
	50 Hz	Driving dystonia hand	4 V
		Sensory response hand	4.5 V
		Inhibiting motor foot	5 V
Lesion 2:
(a) 14 mm posterior to FM	2 Hz	Motor response hand, face	5.6 V
7 mm lateral	50 Hz	Sensory response hand, face, foot	3.8 V
		Driving dystonia hand	5.0 V
(b) 17 mm posterior to FM	2 Hz	Motor response hand	3.5 V
10 mm lateral		Driving head movement	4.0 V
		Motor response face	5.0 V
	50 Hz	Sensory response
		Hand	1.0 V
		Face	2.4 V
		Driving head movement and hand	3.4 V

Lesion 1 was mainly in Vim. Lesion 2 was mainly in VPM (and VPL?) but probably included part of the centromedianum-parafasicular complex.5 All lesions were made on the foramina of Monro-posterior commissure (FMPC) plane. FM-PC distance measured 27.5 mm and the macrostimulation profile showed the thalamus to be relatively narrow. Each lesion was double; two adjacent lesions were made on each occasion.