The study investigates the effect of dopaminergic stimulation over declarative memory
functions in Parkinson's disease (PD) patients. At this aim, 20 PD patients will receive
declarative memory tasks in two different conditions: after 12-18 hours of dopaminergic
stimulation withdrawal ("off" condition) and after the first daily dose dopaminergic therapy
("on" condition). 20 healthy controls will also administered the two tasks in two conditions
with the same inter-session delay as PD patients, but without taking drugs.