Table 1.

Refinement of Testing Procedures Across Experiments

Experiment	Active	Inactive	Intravenous reinforcer during acquisition	Target oral stimulus
1	Nose poke	Nose poke	30 µg/kg/infusion	320 µM menthol
2	Lick	—	3.5 µg/kg/infuion	320 µM menthol
3	Lick	Lick	7.5 µg/kg/infusion	160 or 320 µM menthol
				0.1 or 1% licorice root extract
4	Lick	Lick	0 µg/kg/infusion	1% licorice root extract