It’s not just a movement disorder. Besides causing tremors and other motion-related symptoms, Parkinson’s disease affects memory, learning, and behavior.

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The basal ganglia are a group of structures located deep inside the brain, including the caudate nuclei, lentiform nuclei, amygdala, and claustrum. The basal ganglia play a role in voluntary movement, and also play a role in some kinds of non-motor learning. Damage or disruption to the basal ganglia (as in Parkinson's disease or Huntington's disease) can cause motor symptoms such as tremor or difficulty initiating movement.