Final answer:
The pacemaker that controls the DBS electrodes used to treat Parkinson's symptoms is implanted under the collarbone.
Step-by-step explanation:
The pacemaker that controls the DBS electrodes used to treat Parkinson's symptoms is implanted under the collarbone. It is a small device that generates electrical impulses to stimulate specific areas of the brain and alleviate symptoms of Parkinson's disease. The pacemaker is connected to the electrodes, which are inserted into the brain. The electrical signals from the pacemaker help regulate abnormal brain activity and improve motor symptoms.