Skip to main content
. Author manuscript; available in PMC: 2010 Mar 15.
Published in final edited form as: Psychopharmacology (Berl). 2006 Jul 18;190(3):353–362. doi: 10.1007/s00213-006-0454-8

Fig. 4.

Fig. 4

Mean (+SEM) total NIC intake (mg/kg) for rats that lever pressed for a contingent NIC + VS or b contingent NIC + no VS on FR5 and progressive ratio reinforcement schedules. Significant between-groups comparisons at each day are indicated as follows: *p<0.05, all comparisons (0.09 mg/kg per infusion > saline, 0.01 and 0.03 mg/kg per infusion)