Fig. 2.

Scatter plots showing that the highest dose of LY354740 (LY) (10 mg/kg, i.p.) administered 30 minutes prior to a 1-hour DRL 72-s session did not alter the number of reinforcers obtained (A) and total number of responses (B) and also did not induce a cohesive rightward shift in the IRT distribution. The mean + S.D. are presented for the vehicle and LY354740 treatment in (A and B). The cumulative group IRT distribution in which data were analyzed using successive 6-second bins is shown in (C). For each graph, the vehicle data are provided by black squares and LY354740 data are provided by green triangles.