What motor symptom is often seen in Parkinson's disease?

Tremor is a well-documented motor symptom frequently associated with Parkinson's disease. This condition is characterized by rhythmic shaking, typically observed at rest, and is primarily due to the loss of dopamine-producing neurons in the brain. The tremors in Parkinson's individuals commonly affect the hands, but they can also occur in the legs and head. The rest tremor is often described as a "pill-rolling" motion, where the fingers appear to roll over one another, resembling the action of rolling a pill.

The presence of tremor in Parkinson’s disease is significant not only for diagnosis but also for understanding the neurological processes at play, specifically the role of basal ganglia dysfunction. Other motor symptoms may accompany tremor in Parkinson's disease, such as bradykinesia (slowness of movement) and rigidity, forming a classical triad of Parkinsonian symptoms.

While the other options listed may be associated with different neurological disorders, they are not typically seen in Parkinson's disease in the same characteristic manner that tremor is.