Table 2. Levels of binding potentials for [¹¹C]raclopride in subthalamic nucleus deep brain stimulation-off and -on stimulation conditions.

Condition	Nucleus accumbens		Caudate		Ventral putamen		Dorsal putamen
	Right	Left	Right	Left	Right	Left	Right	Left
Off	1.16±0.36	1.08±0.19	1.62±0.71	1.64±0.66	1.77±0.61	1.80±0.52	1.89±0.49	2.12±0.50†
On	0.98±0.34**	0.88±0.19**	1.47±0.62*	1.44±0.67**	1.77±0.67	1.72±0.54	1.82±0.49	2.10±0.54†
%reduction	15.0	17.8	8.3	11.2	4.5	0.8	4.5	0.8

Values are expressed as mean±s.d. %reduction: the mean value of reduction (percentage) in [¹¹C]raclopride binding during On stimulation compared with Off stimulation. *P<0.05, **P<0.01 versus Off-stimulation condition. ^†P<0.05 versus right side.