Patients with Parkinson's disease have a number of specific visual disturbances. These
include changes in colour vision and contrast sensitivity and difficulties with complex visual …

In the long-term, with progression of the illness, Parkinson's disease dementia affects up to
90% of patients with Parkinson's disease. With increasing life expectancy in western …

Executive dysfunction can be present from the early stages of P arkinson's disease (PD). It is
characterized by deficits in internal control of attention, set shifting, planning, inhibitory …

There is controversy regarding the definition and characteristics of mild cognitive impairment
in Parkinson's disease. The Movement Disorder Society commissioned a Task Force to …

Background: In studies of mild cognitive impairment (MCI) in Parkinson disease (PD),
patients without dementia have reported variable prevalences and profiles of MCI, likely to …

Objectives The description of minor hallucinatory phenomena (presence, passage
hallucinations) has widened the spectrum of psychosis in Parkinson's disease (PD). Minor …

Dopamine loss in the substantia nigra causes several of the motor signs seen in Parkinson's
disease, but there is now increasing evidence highlighting the importance of cholinergic loss …

Patients with Parkinson disease (PD) can experience hallucinations (spontaneous aberrant
perceptions) and illusions (misinterpretations of real perceptual stimuli). Of such …

The main goal of this study was to produce adjusted normative data for the Portuguese
population on two verbal fluency measures: the semantic fluency test (animals category) and …

Cognitive dysfunction is a common symptom of Parkinson's disease (PD) that causes
significant morbidity and mortality. The severity of these symptoms ranges from minor …