Previous research has documented cognitive impairment in the early stages of Parkinson's
disease (PD). It is not known when this decline starts or if decline progresses at an …

Data on the prevalence and severity of cognitive impairment among patients with newly
diagnosed idiopathic Parkinson's disease (PD) is limited. Using a prospectively collected …

The impact of Parkinson's disease (PD) dementia is substantial and has major functional
and socioeconomic consequences. Early prediction of future cognitive impairment would …

Although other nonmotor phenomena representing possible prodromal symptoms of
Parkinson's disease have been described in some detail, the occurrence and characteristics …

Objectives The objectives of this study were to investigate (1) the annual rate of progression
of motor and cognitive symptoms and (2) baseline predictors of different modalities for this …

Our purpose was to characterize a state of mild cognitive impairment (MCI) in Parkinson's
disease (PD)(PD‐MCI) that would be analogous to the MCI that is posited as a precursor of …

This study was undertaken to determine the prevalence and correlates of cognitive
impairment (CI) and neuropsychiatric symptoms (NPS) in early, untreated patients with …

ABSTRACT Background Neuropsychiatric symptoms in Parkinson's disease (PD) may
increase dementia (PDD) risk. The predictive value of these symptoms, however, has not …

Patients with Parkinson's disease (PD) often have cognitive deficits from the time of
diagnosis. Except in patients with dementia, the impact of cognitive symptoms on daily …

The aim of this study was to establish the rate of progression from mild cognitive impairment
(MCI) to dementia in patients with Parkinson's disease (PD). PD patients without dementia …