Although diagnosed by characteristic motor features, Parkinson's disease may be preceded,
and is frequently accompanied by, a wide range of cognitive and neuropsychiatric features …

Affective disorders, cognitive decline, and psychosis have long been recognized as common
in Parkinson disease (PD), and other psychiatric disorders include impulse control …

Anxiety disorders are common in Parkinson's disease (PD) patients, yet are poorly studied.
We examined the prevalence of anxiety disorders in PD, investigated the association …

OBJECTIVES Disturbances of cognition and emotion are common in patients with
Parkinson's disease. Most previous studies of psychopathology in Parkinson's disease have …

Objective: To assess apathy in patients with Parkinson's disease and its relation to disability,
mood, personality, and cognition. Methods: Levels of apathy in 45 patients with Parkinson's …

The author reviews evidence from epidemiologic and clinical studies suggesting a
reciprocal, potentially spiraling, relationship between depression and disability in older …

Parkinson's disease (PD) is primarily a disease of elderly individuals with a peak age at
onset of 55 to 66 years. It is characterized by bradykinesia, rigidity, tremor, and postural …

Objectives: To examine the effect of depression and other nonmotor symptoms on functional
ability in Parkinson's disease (PD). Design: A cross‐sectional study of a convenience …

Background: Depressive disorders may affect up to 50% of patients with Parkinson disease
(PD) and are associated with increased disability and reduced quality of life. No previous …

To determine the extent to which depression complicates Parkinson's disease (PD), the
authors analyzed the literature on depression in PD in order to report on its prevalence …