Pramipexole increases impulsive action regardless of SNc lesion or impulsivity trait. A. Rewards obtained in FCN according to the dopaminergic drugs; B. Chain length in FCN during drug challenge. Data represent mean ± SEM; 2-way ANOVAs; *p < 0.001 from saline. LI: Low impulsive, Int: Intermediate, HI: High impulsive; PPX: Pramipexole, Apo: Apomorphine. Sham: LI: n = 5, Int: n = 12, HI: n = 4; Lesioned: LI: n = 6, Int: n = 11, HI: n = 6.