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

The focus on cognitive impairment in neurodegenerative diseases, including PD, is shifting
from the dementia stage to earlier stages of impairment, including mild cognitive impairment …

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

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 …

Background Prospective data on cognition in prodromal Parkinson's disease are limited.
The objectives of this study were to assess in prodromal PD (1) if baseline cognition predicts …

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 …

A substantial percentage of patients with newly diagnosed Parkinson's disease without
dementia are reported to be affected by cognitive impairment (CI). In practice, however, CI is …

Recent studies have reported cognitive decline to be common in the early phase of
Parkinson's disease. Imaging data connect working memory and executive functioning to the …

Mild cognitive impairment is common in nondemented Parkinson's disease (PD) patients
and may be a harbinger of dementia. In view of its importance, the Movement Disorder …

Abstract Background Recently, the International Parkinson and Movement Disorder Society
has defined research criteria for prodromal Parkinson's disease (PD), but to date their …