6OHDA	6-hydroxydopamine
α-syn	alpha synuclein
CPu	caudate putamen
CXCR4	chemokine receptor 4
CW	continuous wave
DMS	delayed match-to-sample
GDNF	glial cell line-derived neurotrophic factor
GFAP	glial fibrillary acidic protein
GFAP+	glial fibrillary acidic protein positive
GSH-Px	glutathione peroxidase
IBA1	ionized calcium-binding adapter molecule 1
IFN-γ	interferon-gamma
IL2	Interleukin 2
LED	light-emitting diode
MDA	malondialdehyde
MPTP	1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine
NA	not available
NR	not reported
PaG	periaqueductal grey matter
PBM	photobiomodulation
PD	Parkinson’s disease
PVT	psychomotor vigilance task
SNc	substantia nigra pars compacta
STN	subthalamic nucleus
TH	tyrosine hydroxylase
TNF-α	tumor necrosis factor-alpha
WT	wild type
ZI	zona incerta
ZI-Hyp	zona incerta-hypothalamus