Figure 7.
Cocaine self-administration before access to saccharin. (a) Mean (±SEM) saccharin (0.2%, last 3 baseline sessions followed by 14 testing sessions) self-administration during block 1 and block 2. Note that during baseline (BL) sessions, the number of saccharin rewards was identical during blocks 1 and 2. *Different from block 2 (p<0.01, main effect, ANOVA with repeated measures). (b) Mean (±SEM) cocaine injections before access to saccharin during block 2. Cocaine self-administration was limited to a maximum of 4 injections.