" Parkinson’s disease is a neurological disorder marked by the gradual degeneration of nerve cells in the portion of the midbrain called the basal ganglia, which controls body movements. The brains of those who have this heartbreaking disease don’t produce enough of the neurotransmitter dopamine, which the basal ganglia needs for proper functioning. Early symptoms of Parkinson’s, which is currently considered incurable, include motor issues such as muscle rigidity, tremors, and changes in gait and speech patterns that override voluntary control. In "

― Joe Dispenza , You Are the Placebo: Making Your Mind Matter