The effects of DC or LHb lesions on ulnar inhibition of cocaine-induced c-fos expression in the NAc. (A) The cocaine-induced increase in c-fos positive neurons in NAc (A2; Cocaine, n = 6) was attenuated by ulnar stimulation (A3; Cocaine + MS, n = 6), which was prevented when the DC was damaged (A4; DC X + Cocaine + MS, n = 6), but not STT (A5–6; STT + Cocaine + MS, n = 6). A1, control (Con); *p < 0.05, Bar = 20 µm. (B) The cocaine-induced increase in c-fos positive neurons in NAc (B2; Cocaine, n = 6) was attenuated by ulnar stimulation (B3; Cocaine + MS, n = 6), which was prevented when the LHb was damaged (B4–5; LHb X + Cocaine + MS, n = 6). B1, control (Con); *p < 0.05, Bar = 20 µm.