A, Mean (± SEM) number of gapes elicited by a 3 min infusion of a 0.1% saccharin solution that was paired with the posterior IC administration of: VEH (n = 10), 10 μg of mCPBG (n = 10), 30 μg of mCPBG (n = 9), or 0.1 μg of OND–30 μg of mCPBG (n = 10) in Experiment 4a. Bilateral infusion of 30 μg of mCPBG produced more gaping than the 10 μg of mCPBG and VEH on C2 (p < 0.01) and on the test trial (p < 0.01), which was blocked by OND pretreatment. B, Mean (± SEM) saccharin preference ratio (saccharin/[saccharin + water]) in a 120 min two-bottle consumption test for the posterior IC groups: VEH (n = 10), 10 μg of mCPBG (n = 10), 30 μg of mCPBG (n = 9) and 0.1 μg of OND–30 μg of mCPBG (n = 10) in Experiment 4a; the groups did not differ.