Nonmotor symptoms (NMS) are common in patients with established Parkinson's disease
(PD) and have a major impact upon quality of life. We investigated the significance of NMS …

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

We studied the relationship between two screening cognitive measures and off motor
Unified Parkinson's Disease Rating Scale (UPDRS) scores in 108 Parkinson's disease …

Dementia is a frequent and disabling complication of Parkinson's disease (PD). Clinicians
and researchers lack a biomarker capable of tracking the structural and functional changes …

The extent to which concomitant Alzheimer's disease (AD) is etiologically related to the
development of dementia in Parkinson's disease (PD) remains controversial. We explored …

The aim of this study was to investigate factors associated with decline in health‐related
quality of life in Parkinson's disease, by a retrospective cohort study from referral centers in …

Mild cognitive impairment associated with Parkinson's disease (PD) is a risk factor for the
development of dementia. Despite the importance of early identification of mild cognitive …

Substantial variation in the prevalence of dementia in Parkinson's disease (PDD) has been
reported. The aim of this study was to review systematically and critically previous studies of …

The purpose of this study was to investigate cortical dysfunction in Parkinson's disease (PD)
patients with amnestic deficit (PD‐MCI). Perfusion single photon emission computed …

The aim of this study was to analyze the efficacy of a cognitive training program on cognitive
performance and quality of life in nondemented Parkinson's disease patients. Participants …