Reduced dorsal visual stream α2-adrenergic receptor availability is not associated with visuospatial impairment in Parkinson's disease.
BACKGROUND Visuospatial deficits are a common and disabling feature of Parkinson's disease (PD) that are linked to dysfunctions of the dorsal visual stream (DVS) and the cholinergic system. However, a body of evidence also points to the possible role of noradrenergic dysfunction, but direct in vivo evidence has remaine...