Fig. 1.

Lack of appreciable effect of LY354740 on the number of reinforcers obtained (A), the number of total response (B), and the IRT distribution (C) for rats (n = 16) performing under a DRL 72-s schedule. Rats were injected with LY354740 (intraperitoneally) or vehicle 30 minutes prior to a 1-hour behavioral session. These results are the combined effects on two independent cohorts of eight rats because there did not appear to be appreciable differences between the two cohorts. The results (A and B) are presented in the form of scatter plots in which the mean ± S.D. are represented by the middle (mean) and the higher and lower bars, respectively. The vehicle condition is shown by black circles, whereas the data for the different LY354740 (LY) doses are represented by 0.5 mg/kg, magenta triangles; 1 mg/kg, orange circles; 2 mg/kg, blue diamonds; and 4 mg/kg, red squares. These same symbols (other than a square symbol for vehicle) are also used for the IRT distribution in (C).