Background Cognitive impairment is a common and devastating manifestation in
Parkinson's disease (PD). We aimed to identify modifiable risk factors for PD with cognitive …

Mild cognitive impairment (MCI) may predict future development of dementia in Parkinson's
disease (PD). We aimed to examine the extent of subcortical brain atrophy in patients with …

Idiopathic Parkinson's disease (IPD) has been subclassified on the basis of predominant
motor symptomatology, age at disease onset, depressive affect, and cognitive performance …

We studied the influence of three sets of diagnostic criteria on the age‐and sex‐specific
incidence of Parkinson's disease (PD) among residents of Olmsted County, Minnesota, for …

Cognitive impairment in Parkinson's disease (PD) greatly affects the morbidity and mortality
rates of the disease and can be present as mild executive dysfunction even in the early …

ABSTRACT Background Diagnosis of Parkinson's disease (PD) is typically preceded by
nonspecific presentations in primary care. Objectives The objective of this study was to …

Objective: To report the rates and predictors of progression from normal cognition to either
mild cognitive impairment (MCI) or dementia using standardized neuropsychological …

Parkinson's disease (PD) is frequently associated with mental dysfunction. Domain‐specific
cognitive deficits are ubiquitous, and although they may not be clinically apparent in all …

The impact of dyskinesias and motor fluctuations on quality of life (QOL) at various stages in
the course of Parkinson's disease (PD) is not well understood. In 301 subjects with early PD …

Little is known about the course of depressive symptoms in Parkinson's disease (PD). We
studied the course of clinically significant depressive symptoms using data from two clinical …