Recent studies suggest that the basal ganglia contains five segregated circuits for different funtions of behavior. Each involves seperate regions within the basal ganglia and the thalamus. Includes slow, sinuous, aimless movements. Also difficulty in speaking and swallowing. The cause of Parkinson s disease has been found to be a lacking in dopamine in the brain.
Dopamine is a neurotransmitter which is critical for normal movement.
Eighty percent of the brain s dopamine is found in the basal ganglia.