Effect of acute aripiprazole treatment on cocaine and food reinforcers earned, percent cocaine choice, total response rates and front levers response rates (ordinates), shown as a function of cocaine dose (abscissae). Data are group means, where treatment points are day 1 data, approximately 2 hours after minipump implantation, and baseline data from corresponding rats are the mean of three sessions for each rat; bars represent one s.e.m. †p<0.05, †††p<0.001 vs. baseline, Bonferroni posttest.