Table 1.

Abbreviations used in this article

BG	basal ganglia
CmPf	centromedian and parafascicular nuclei of thalamus
D1 receptor	dopamine receptor subtype 1
D2 receptor	dopamine receptor subtype 2
GABA	gamma-aminobutyric acid
GPe	globus pallidus externa
GPi	globus pallidus interna
ICD	impulse control disorders
LID	levodopa-induced dyskinesia
MSN	medium-sized spiny neurons
PPN	pedunculopontine nucleus
SNc	substantia nigra pars compacta
SNr	substantia nigra pars reticulata
STN	subthalamic nucleus
vGlut1 or 2	glutamate transporter isoform 1 or 2