The primary symptoms are the results of decreased stimulation of the motor cortex by the basal ganglia, normally caused by the insufficient formation and action of dopamine, which is produced in the dopaminergic neurons of the brain.
Os síntomas principais son o resultado da diminución da estimulación do córtex motor polos ganglios basais, normalmente causada pola insuficiente formación e actividade da dopamina, que se produce nas neuronas dopaminérxicas do cerebro.