Pramipexole differentially increases waiting impulsivity depending on SNc lesion and impulsivity trait. A. Rewards obtained in DRL20 according to the dopaminergic drug; B. Efficiency (reward/response) in DRL20 during drug challenge. Data represent mean ± SEM; 2-way ANOVAs; *p < 0.01 from saline, # from Low impulsive. 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.