Figure 2

Effect of ICV treatment with NPS (1.0 and 2.0 nmol per rat) or its vehicle (0.0) on alcohol self-administration in Wistar rats (N=8) under an FR-1 schedule of reinforcement; (a) active lever, (b) inactive lever. Values represent the mean (±SEM) number of reinforced responses at the active lever or nonreinforced responses at the inactive lever. Difference from vehicle-treated rats (controls) was not significant.