Fig. 7.
Effects of bilateral NAc infusions ofRp-cAMPS orSp-cAMPS (40 nmol/μl per side) or vehicle on food-reinforced responding. Each food-reinforced response was followed by a 2 min time-out period when subsequent responding was not reinforced. Under these conditions, food reinforcement rates approached a maximum of 60 food pellets in 2 hr. Open bars show baseline responding; solid bars show the effect of NAc infusions. Data are expressed as the mean ± SEM (n = 8) for the rate of food reinforcement (A), for nonreinforced lever press responding during the time-out periods (B), and for responding at the inactive lever (C). Asterisksindicate that values differ from baseline values by pairedt test (*p < 0.05).