Final answer:
Around 50-80% of individuals with Parkinson's disease eventually develop dementia. Parkinson's is a neurodegenerative condition that affects movement and cognitive function, with dementia symptoms worsening as the disease progresses.
Step-by-step explanation:
Approximately, 50-80% of people with Parkinson's disease develop dementia. Parkinson's disease is a neurodegenerative disorder that leads to a loss of dopamine neurons in the substantia nigra, resulting in movement and cognitive symptoms. As the disease progresses, there is an increased risk of developing memory loss and other cognitive deficits that can lead to dementia. Dementia associated with Parkinson's can manifest with problems in executive function, attention, memory, and language.
The precise cause of Parkinson's-related dementia is multifactorial, with genetics and environmental factors contributing to its development. The presence of Lewy bodies, abnormal protein clumps found in post-mortem analysis, often correlates with the severity of the disease and is also linked to the onset of dementia.