What are the symptoms of Parkinson’s disease?What are the possible causes? Environmental causesWhat are the possible causes? Hereditary causes.What parts of the brain does this disease affect?Why do you think the neurologist prescribed selegiline instead of L-dopa?What disorder was most likely being treated by this operation, and how is the surgery performed?In what way is the surgery expected to help Sabrina?Risks and benefits of sugeryWhat was the cause of the apraxia?What does the reduction in apraxia symptoms tell us about hemispheric specialization?